f!l [ ct)py - usbr.gov ~ s.;~ , - ,~j~l ~ * j . j s~'ct"ion g-g ~iec'r/on n-~.~...
TRANSCRIPT
'f"· '
•
'f '
>-,,
HlO�-�
DF ,F /C� r.' � r ""' \ � ........ Ill I," I' 1;! ,� t �� It 'i l1 .: � � •.n y � tJ
B'i�? \l' r'? Re.CLA'.r.ATION
LY �- ·;·i,;,� . \�<(:PA 'ORY
HYDRAULICS BRANCH OFFICIAL FILE COPY
********************* * * * * * * * * * * * * * i', * * * * * * * * * * * * *
UNITED STATES DEPARTMENT OF THE INTERIOR
BUREAU OF RECLMI..ATION
- - -HYDRAULIC LABORATORY REPORT NO. HY�6
- - -Technical Memorandum No. 255
- - -STRUCTURAL DESIGN STUDIES AND
MODEL TESTS OF HOOVER DAM SPILLWAYS
By
B. W. STEELE, D. C. McCONAUGHY and E. W. LANE
- - -Denver, Colorado
October 2, 1931
* * * * * * * * * * * * * * * * * * * * * * * * * *
*****************************
�
·' --¾., 0
0
'!
Tnhle of Contents
Synopsis
Conclusions
Cost estimate - Finnl plnr.
Geolo �ical exE".minations
:1rill loc,:s
Ston�y g�te ·:1i th side char.nel - Desi11,n and �ests
Drur., Gate Spillways
Desi?l 1ata
Prelimin?ry te�to - Fontrose
?rt:?l t�.iner;r tests Fort C.ol lins
Comnuted wster surfrces
Transit ions
Bend loss�s
l-"odel tests - Hori:::on'tRl bC!1'.'S
Y.,b1rll tests - 7Grticr-l h::;n'.is
Entrained !-!ir
Freouency of US:°) o:' s�illwA:"s
Re servo i� ·.r1Ater surfl'!C'<?S
Flood capacit·r -· Sr·ill· .. ,y11s �nd r�scrvoir ' '1
•
Other ty11cs of cr03t
Spillwo:;rs with s(3,:;.rete outlet tunnels
Spillweys -:.a:i t� outlot to Spillway Wesh
Cost o:r al t,Jrn:::ta desitms
Pnga Ho.
2
8
16
l?
23
25
33
41
48
50
55
55
56
. 56
60
60
61
61
65
67
69
70
0.
a
List ot .Drev:i!l§o
Exhibit No.
Hoovor Dam - Gon,3rol Plen at D��s1 ta'
O.mcral Plen end S-:ctions - Arizo:i.r $!lill'."i .. 1Y
Page No.
1
10
S Genoral Plen end Suctions - }Tl!)vrid11 Spill,;-·t)y 11
3 60 x 80 Ft. Stonc·y Gate - Novadr. Spillr.ay 12
4 Channel Beffles an� S111 for Drum Ge:to Spillways 13
5 Gvolo�y at Ori-�innl Arizone SpillwP-y Si to 18
6 Gt1olo� et Arizon:J Spillway (cross sections} 19
7 AnHlysis of Spillwny Croat - G�to Raised 35
8 .An�lysis of Spill�cy Crest - Gate ]J)werod 36
9 Drum 'Jatu Control ?.!cchenism Assembly 37
10 Spillivay Pier Details 38
11 Spill·:-7ey Crnst !Xltoils 39
12 Novad� !>:'um Gate Spillwny {First �sil;Yl) 42
1:3 · Dr\ll'll Gato Spill·::e:,, - Fort Collins ?.b<kl No. 1 47
14 C'lmput d · .. nd Obs(. rvcd Wntcr surfaces - Fort Collins Spillr!ay lbd'71 50
15 7(-3loci ti.)S f:nd �pths fo:r Spill':;ny Tunnel 57
16
17
18
19
20
21
Ros .. ;�voir J_ction - Ton-Thousand-Y,.rn:r Flood. Tv:o 400-Ft. Drum (}at:, $")111·:�ays
Fr-�o Cr::!st - Re �ui:rcd Longth
Gnnr�r�l Lr:yout - &nurot� Spill·�my runn,: ls
Alt:'rnst.· �illv·��, Location in Sr,ilh.:�:, w�r:h. ·)n0 ?5' Eo1·s,.-shoc Tunn:Jl
Alt.3rn:�t-- Sy.ill·,-;ay Location in Spill·.·c::y We.sh. �·:o 75' Hors�1shoo Tunnels
Al t·n·nstc Spillv;��Y Location in ST,'ilh�P:.r ·.'!Ash. • Fiv3 47.2' Hors0shoc Tunnels
64
86
71
?2
73
?4
G
0
Plate Uo.
1
3
4
5
6
?
8
9
1()
11
12
13
14
List of P:1oto�anl:s
lbd0l of .::�csirm shown by Exhi1'i "::s 1 or,d ?. • (Tort C0llins - Scale 1:eo)
��oiel of desi:m sho 1•1'n by Exhi't-i. ts 1 �n".1 2. M:>dified c:r bafflt"s in chann.::l. (Fort Collins - Sea lo 1: 60")
t:o:iel of desi.cm sho 1.-m in Exhibit 3. (Fbrt Collins - Scale 1:60)
Porfoi�e!'lce of d�si�n shovm in Ex�ibi t 3. (Fort Collir.s - Scale 1:60}
P3rf:)rr.�ance of dJS!.t"1 shown in :Exhibit 3. (Fort Collins - Scale 1:60)
Pa:,f')rr.t&::ic·3 of dosi -;n sho�,n in Exhil;it 3. Abm:.·mal co;dit:ior.s of discharC?,o. (Ttb�t Collins - Scale 1:60)
!'orl 31 :-Jf ri,_.si!}'l'l shown on Exhi'!'--it 0.
App:?':lr'3:-:cc. o!' ,i0t at lo·Pcr end of tr,msition. ( For t Co 11 in::; - 3c a le 1 : 60 )
First drurr. r:"to mocul (Exhibit l��. (:'-'ontros� - Jct:: lr: 1: �O)
!1:0-� :l of <ie:.t:i·,·n s�.o--:m b:,r Exhibit 1�. !.�o,H�i·Y1 b:; T''..::in;_.a .f'lo-Jr, copin15 bnfflc, tell
;1011 th :;nr� O:!" i fi (:{;. (7\'l,., ... t..,..,..,_c.• ·. �"''·l, 1·20) .. u . .i "' ·J.,_,,_. - ._,,�·.· ·- • ..,
r,.�o � :·) l O f ,�;:; E i ·�n Eli. ry:,n b :r Exhibit 1�, • ( To -r·� Co 111 nn - -Sc nlr.� 1 : 6'))
Page ro.
14
15
2?
28
29
:30
32.
44
45
51
�ff,.Jct of rl::.ff.::r·�-�t h,·i>!.hts or crosr; ·,1 -.::ir in �hAnn,.:-1 52 ')n �hi.b:tt 13. {li'ort Collins - Sc� le 1: 60)
J..n'.'! cr0s:- ·;·r.ir v:ith lar�o l&t-::rr:?. cont:!'ection. (FJrt Collins - Cc�lc l:BO)
Sm:1� as Fl 9tc 12 ·JY.copt f·Jr ad ·H t'ion of baffL:s. (Fort Collins -. Scol� 1:60)
Flo·" in horizontAl bonds. (Fort Collins - Scale 1:60)
53
54
59.
' "-,
\ ----�t
I
.. . ' I
\ '·
,\· \
._,,'
. �--.\
\ \
/
•\
.-:. .
(
i'
----rM.. - � ·s-sHYO - • /,
Denver, Colorejo, Octobor 2, 1931
I:'EM)RA!'DU!! TO ·r:rs ,:I-T:�T-' :D�3!0l-TI�TG �anrr-m By B. ''!. St-.:H:lc, D. c. t�cCie>!'lau�hy nni 3. w. L::·ne
-SUb.inct: 3tructur .. l �e;s'i"11 Gtu,H ··.::; �nd Voicl rssts of Ho0vcr !)ar.,
Snill··,ny 2.
0:."''0'PSIS
1. A,.. tc:.�: c.d o:re �,m,:!rDl lnyo 1.1ts of th:; d�si :--n nor: !J:::-'OTV.)S13d
for t�.� l-{oov•.,r :)r-�1 �TJi! 1-.,��·s. (�xhihi ts l ".nd 2.) ?h0w !'.Ut:t the re-
r. ui re!� ·!r.t of t !-le Colorr 10 Ri :0r Bo �rd thrit th,) spilL-·n:r c•,pr-ic i ty nlono
r·ust b1.1 400, �i�o s•..:conci-foc�t · ·:1th lnl{o w�tc� �·1rf'3ce l· t El. 1202; nnd
that t 1�2 t0tr,l l i s1..�r r:rr'� of snilL -�ys r:n:1 pcn-;r -plant r;us t W> t exc.J:�d.
'?5,000 s::co"1'1-f,1,�t ·:·it}·. l�ko r.vater surfr::::=e · .. t �L 1229. Th-:� '",•:•o
f":;111·.,;,-,ys �'."':'""·J roan r: 0dc n.;'P:ll in CS}')f:ici ty �Jnii f-'.h�J di�chFr�e tb··ough
the '90'-·-2'!r plr.mt te:,r-n ,:s l?.,"'OJ �;::cl)rni-t,·ot. A mod-.1 ryf •tr.ifl dcsi.:m,
built to J3 sc�l:1 :>f l to f:J, hno hcr.-n test•:d �t Fort Colli:i�,. A rno1-
el, to Ei seal· )r 1. to 2", ;_s h\.'inEs built -it 'bnt:ros(.; nno····ill be corn
pletad in ti:�:.· ''.):r- i11.src-:1tLrn by the ho:Jr:l �t it:: cor,ing !'.'l<K ting.
2. It ··ill t,� noted t1ct the -i .:s:o:n differs fro!'1 ·that shovm
in th�� s-:,.-:ci1"ic·tioT.iE, i!" t l ·1.t it c0nsists ,jf r. 1rurr� :--:nte cr,�st, 400
f::ut lon�, ·v':--.�rnas th..:. S')<V�i 1'icntions c'h()··� � ?OO-foot f:rao cr1-�st ···1th
a 50 x 50-foJt Ston::; "'ntc. ncr0ss the cr�nn°l :-t -the un:,m· �nrJ.
3.' �u ._-1e;r-i.!'.Pn cont0!'!PlPt�� b�r thi: snc'.!ifict tions ··.;�,s pre-
p9r0d for a �:>tr.:l spill'•t:::, r�n1 outlet cnp�ci tjr of 400,000 &ccond-fr-idt
··r:1-t;h lak� ·:,.gtcr su::-foci: l,t 31. 1232. In acc'Jrdence; ·,·ith Gunv!"al
2
S1b�rt • s lot�or$ o r Dr ce�hor e , 1,30 , end DecQmber 19 , 1930 , the ce-peo-
i ty WAE incr0 a sod to th � t st r t e � in per � -r ��h 1.
4. ra1- 1(� I ::.. > o· s l "'!"1�t'h � o f f� ·o 1 C "!" J st n(: c c: ssnry for 'l givon
� i � =- of Ston ·:;y ,...,.: t ,:; t() r .., . - t � h0 ?;- �rx iriur:' r,; .... '1 i �·:1:· ·.:mt of 4CO , O )D second
f,1 ::� t total d i s char - : i r.'rou !'!: 1 sn i ll·rra:rs r! lon-.' ; th� d i sch�rg� at �l.
1229 , ·:1h i ch i i:, i s ,L drod should not i::r. c '-' :? i o tot E-1 v f 7 5 , 000 sccond
f,J0t ; end th· ? ! Lvr t i on r! t --·h i ch th a dc� ir .. 1d t , >t �3l d i sch err;o of 7 5 , 000
s-.:;con d- for. t t !-"1rouc;h sr,ill·rays (,n d po·:1t.3r pl ant :"1o uld r- e r :; t"'ch0d . I t
i s appar -:m t f'rom the t rb L� the t a ss crifica in t ho elcvntion EJ t ,:h i ch
thc.; tot � l d i schargc o f 75 , 00C sccon d-fcvt i s rBachc: d v:')uld be �uatly
in tho i :iit,.:r:� s t o f J conor::y. Tho comb in c t i�n of o 60 x 80- t"'oot geto
1:1 i th a 400-�oot cr:� s t -;-a s scl ,1ctGd for study an 1 d � s i �s 'i'�0ro prcpm-cd.
Th,:: des i rm ro� th ,:: ?,rl : " ... �a. ,- side i s attachod (E:-c.hit i t 3) .
TABLE I
FR� CF.SST "TTI! sm�� GA� AT ?.\TD J F C1-!JJ-.i?�L
Di sch arc;0 or T-;:o Sp ill--·ays and Por;er Plon t for V6r ious Fix-:-:d
Cr�st L�n �ths w ith Ston Qy Gnt e s
Totnl Cnp�:! c i ty Sp il l�·: �y� Alonn 400 ,0Qt) Sc c. -Ft . a t El . 1232 .
Size Gt".t .J-Ft . · 50 X 80 55 X 80 , · 00 X 80 L�n�th Fixod Cr.-:st - Ft . 400 500 600 400 500 GOO 400 500 600' 700 Di s chor/7,"°" a t �l . 1�29 -Thousan ti S:3c . -Ft . 110 105 100 92 88 83 ?4 71 66 63 El. at -.vh i ch Di sch Ar.0:· ' i s r-4 t-- N N tO 0 � tO a) • • • . . . • •
\£.) � � L'- QJ u.; <.C QJ 75 ,000 Se c . - C\) C'l N � N N N N N C\, N N C\l N (',} N N N Ft. ,-; ,_. r-4 r-4 ,_. r-4 ,-.f ,-.f ,-.f . ,-.f
3
•
\
5 . A mo d el o f the Nevadc s o i l l-:my was bu i l t r:1 t Fo r t Co l l i ns
to e s c a le o f 1 to 60 . The per fornance o f th i s nod e l wo s d i s t i nc t ly
d i seppo i n t in .-;. The curvr; t urP. i n the chonn � l h elo,,, the �n te se ts up a
v:ave o n t he left s idP o r thP. s-pil l·,· ·ry a t t� 1 lo •,·,er cn n o f th � sp i l l
,roy cre st ; wh i ch 1 £ v·. ;ry n;rf' ntly rr n O'n i fi '::! d r y th13 c ro ss current formed
by t h .:! wat er pour i r.r.- o v0r the o pe n cre s t . I'h i s ·,vsva i s re flec ted b �i c k
0 n d f�r th n c ro ss t h e trans i t io n and sh ri f t , caus i ng ver y ro ugh sur fa ce
flow �na f i l l i n� t h s Fha ft comple t e ly � i th a haevy spr 9y .
6 . I t i s o bv ious t h at t h e � c t i 0 n o f t he cra ss current i s t fun c t ion o f t h 8 e �er ".';y o f t h e wa ter , wh i c h i n tu �n i � d eper.d'::?nt on the
d i fference i n e l � vP. t ion r e tween l n ke And c he nnel vrn ter t:ur fa c e s . A
d e cre � se i n t � i s 1rop c an be � c connl i shed o nly by r n i s i n� t he wa ter
surfa ce in the c h n nn�l , v,� i c h ·.rrou ld cu t do·,m tre c Anr- c i t y o f -+:he �a te ,
re qu i r i ng e i t �er s 1 �r"�r �� t e or � lon �er cre s t . I t n l so opne nred
t h � t no curvr-l t U're f1 1-:ouln be � 1 1owed in the c hann :1 1 . eloi:: t!"'.0 f.!'5 te ,
ne ce,s s i t o t i n� thr·rn ina the upper and o f t h-J c h �m1ul fur t hAr into the
s i d e o f t h,� cF.Jnyo n , ?'h i c h wou l d �re a tly incr d r- �: -3 th.=: ar.1ount o f' ex c a
vat io n a n d r d su l t in � s� srpor c urve �hov e th0 �� t£ . The f i nal r e sult
would be 9 ma tcr i � l incJ"eose i n co s t , thE a!""0unt d e pend i na on the re
qu ir ,1 d s i ze of t h e <?1 , t c , ·•·l1 i ch 9 lre aay nxc ·"' ·: k d !)r0 c e :knt .
? • Cl'J SC!' e, xer. i nP.t i o n o f the s i t ,J l"')ropo scd fo r tho Ar i zona
sni l lway c aus0d do ub t P E t� the noture o f th J ro c k and the advi sab il i ty
o f pl � c i ng the s p i l l·, : ro :r in t h i s loc a t ion 3 t t l: :.; top o f en E-i ll:t0 st ver
t i c al cl i ff ; a �out t 1:r. i ch ,;:a s la t 3r con f i rr.md by ��o lo�i cal i nves t i
ga t io n s e. nd by dr ill r. o l ,:. s . Tho up:,3r end o f the l arge drm� j ust
4
,.
•
above the d91'!'1 affords a better site but is not adopted to th is type of
spillwr.y on c ccount of the heavy approach cut to the gate which is
required • . Only e limited length of tree crest is economically avail
able , requiring a l�r�e �ete if the drop in w�ter surfsce from lake
to channel is mode sm�ll .
8 . In view of the F,bove , it wtts c\ec ided thet a conservat ive
pol�cy d ictated the chan�e to the drum gcte crest , which reou ires no
unprecedented s ize of gate , or sacrifice in re�uire�ents , ond is bet
ter �1 f:pted to the topogrephic condi tions &nd to the belanc in� of d is
cher�es as required ; 1 . e . , 31 , 500 second-feet uncontrolled d ischorge
vri th water surface at !U . 1229 , snd 200 ,000 second-feet maximum with
WPtor surface �t El . 1232 , for each spillway.
9 . Simultaneously with the Stoney gate experiments e t Fort
O:>llins , a modal o f a desi� for e drum gate crest was built at Mont
rose to e scol3 o f 1 to 20. A very lArge reduction in tho ost imeted
cost could b� mede ty incraAeing the velocitiaa toward tho lower ond
of the. chennal ; so as to hev� ea smell a tunn�l s�ction as possible
et the portal. Thv chennel floor , boginn�n� about 150 feet from the
lowor and o t th� orest , was cccordingly etoa�oned so e s to throw e
pert of tho trans it ion curvo into tho channal i tself. Thia model
showed tho sema d iseppointing feeturo es the Fort Collins Ston�y �ate
model ; nan�ly, that an..v considerable drop from lake to channel water
surface rosultod ·1n too greet oner,n, of cross flow , creet ing _ conditions
unsuited to a closvd section. While the structure wee not �acking in
capacity, the flow cond itions wore bad. So fer as flow in tho shaft
5
•
end tunnel ,vere co::cerned , FJ snt L.,factory condition was created by
choking the tunnel entrance to f9r� , at discharges exceeding about
150 ,000 second- feet, a submerged orifice , with a bell mouth entrance
and an eir duct below. At maximwn c apa c ity , conditions were feirly
setisfactory ; but et low diachar�ea flow in the channel itself was
rou�h. Nmnerous t�'J)es of baffles placed in the channel P.ffected
only minor improvement . This design was re iected end e model of e
new desi� built at Fort Ciollins.
10. In this new design the channel was modified to omit
the extra fall �iven to tho lower end of the channel floor in the
l�ontrose rJorhl. The n�w model had en oµen top : 'rom the lov;rer end
of th 3 s-p1 11Wl3:f crost to the lower end of the verticol transition
curve so that flo·n condit ions ':'round this cur .. ,e P.nd in the shaft
could be · ohserved r��u ily. Tho vortical curvo b��an at tho eleva
tion of th� c� �nn0l floor .
11. NWlero�i s dif:'\.?rcnt sat-u-,s wor ·J made by neans of fr>lse
work nla c\�d in t11 h:. model , the se experiments coverin_c;, a Perio d of sev
eral weeks. Ba ffles off acted only :minor improvam�nt. It rrns evident ,
both from this model end thet et Montrose , thnt rfoep water in the chan
nel was by f,�r tbs r:10Et pr �ctical meens of nroducing BI!looth flov,.
Since the �ater must pass through the critical depth et th0 beginning
of the vorti cal tr�nsit ion curve , it ep�o ared nucessary to make the
wot�r surf�co �levct ion at critieol danth co inci de w ith an elevation
which would �i ve e sntisfactory dopth of wnt0r at tht� lowor end of the
.. channel ; foun1 by experir.iont to ba about 95 fnet.
6
,.:
-�
12 . Thia cnn be � c complished by a r ise in the bot ton dcwn
streem o r the end of the e pi'.'..lw'3y cre st , by s contract ion of the s ides·,
or by e combination of the t"t10 , By me ans · o r ax� ar i!?1er.t ·i.ng with numar
ous comb inat ions the �1e thod err.bo died in t he deai� no,., p� ,;,c sed was
evolved ; consist ing or e weiT acro ss the lower end o r the chenne l � with .i
e moderete contract ion on the crest side .
13 . '!rom e��erimsnt s it was �lso found that some dista�ce
between the lower end of the spillway crest end the poi nt o f cr i t ical
depth was ne cess�ry for smooth flo w ; the d i st ance ( SO feet ) shown on
the design now ,ro� sed was found to be best . Less d i stAnce wos not
eff�ctive , and mor'3 shov:�rl e it her no impro ver.1ent or a detor iorat ion .
14. Bc.ffle e · a lon1s tho bottom o f the chenn3l , wh ile not con
s idered esse!'lt i al , st ill e ffl!ct enou�h imprJvement ·b be though t .,,e ll
worth wh ile . The t�.rp-:: sho•rn ha s so fer .r.?: iven th � be st results of
r.1eny tr ied ; .lxparimc nts with otr.ar t y-p,·) s ar . . ' s t i ll i n pro m- .ms .
1 5 . Th e curve o f th� tran s i t ion ''IP. a a lso the sub 1 oct o f
consid9rabl·J st::t�y. Th �) m,1 thod ofton or.19loyod of usinr- f. pcrebo l a
who so o�motion is ·k.ri ":e1 rrorn the r1ean vo b c i t :r of th0 we tdr and the
acc 0lerat ion du� to ��ev ity � ives a curve much too sherp to ba sui t
able . Th i s wi:ts ar. t ic ip!: t od , and tho first du s i .:ns sut st i tuted for the
m� an ve lo c ity in thi s r�ethod tho tot a l ener gy o f the w1-:tur ( a epth plus
v�lo c ity he ad ) convertod into velo c i ty. �ven th i s gDve too abrupt · e
curve . Tha curvo usGd wns det�n-: inod 'by· cxp0r i!'1e nt in.:; t ill Fl sr,t is-
fa ctory con� ition �6S o btc inad .
• \
15 . Th.a d0rthe in the £ haft end tt1-"1ncl o :' t!l(� ::x, ,1 --.:ls cho;)<'!k
the computud depths very clos-1ly. The ...,r tar sur f() C� o k vF.r!: ions in the
s ide channel a!"a con ds�e�tly lo":'Ter th an t!los , ) r.:c! .. pll� •:': ; ) hy r:i s.�- ·· L :
amount I th'3 d iff..3rencc. b ,� inl'." due pr i::c i;,al:!.y to ':! l�ck -of ,, �aa:.11P.ni;
between the o bs�rvcd end the comput ed �et�r sur fbc�s noar �ho co�trol
sect ion at tho lo�cr end of t�o ch&nnel . This d i ffGronc� probably is
duo to tha assumpt ion of a uni fom ( mean ) ��lo c i �y o v�r the �nt ire
w:)ttod sect ion ; an assumption v:hich , e l-;:� ys in •;rror , nrob�bl�' is much
mor� th�n usu�lly so in thi s part i culPr case .
OOMCLUSI01'TS
17 . From thd result s o f tho struc tur �l de s i gn stud i�s 6nd
mod el t0sts , it is co ncluded :
( a ) That t h .; t�,"pe of sry illwe:1 shown in SD : r i fi c �tiona !To . 519 i s
not a s well ejaptcd to tho co �d it io�s At Hoo�er Dr.� P. S e drur1 7,ot e
crr:- st o f a d.Jsi� s imilor t.o the on ·: s ho·..,� in Exhibi t 1 nt t n ch :1d .
( b ) ThAt thi:3 coribin� t i on o f � Ston , :r ��t :-: : nd unc,;> n�r� llc d crost
produc�s uns'lt isfe ctory hy� 1· i:,:. l1c co nd i tions.
( c ) Tha t t:1e drop from �ho rt1sorYo i:.· � .. -, �., t �;r surft:. co to thd water
surf�c\, in th:J char_11cl shoul1 b 1:.1 t�e min irn.1� th e t cond it ions will
p�rmit . ,'
(d ) That an offs,.; t in the che!ln·.) l a t t h : -�rd o f t h:: cro s t i s
desirebld t o provide e sr t is ��ctory co nd i t ion � f flo� o n that s ido
of the ch�nnal at thet point .
8
( e ) Th - -· t i t is ·.' s s .- � t 1. 0l to nl �cc t l: � l:- �<2:inni�r- o f t'ic vcrt :
cel curv:1 '':' •)11 bolo· ... t:, ,j �,-:1,1 o r"' th � S "'ill,w:t cros�.
{ f) Th <:> ¼: P. -�r -i r · 1· � 1- .,,_, .,, ct 1· ,..ri11·, n �rn-., t � c:· 1 f'� ,-. -. ·· ·c�· , c-s t h•"' ·� ..I ... ., • ; • .. • t... - • J �' \ � • .., • - - --· ,.; .... � - ,_, � ......
channJl a4; t �1 3 1-. :...:f!inn:!.n?" o f th J v.:!rticr:l cur-T.� i s r. :; ccss , r�.r to co n-
· trol the d•J?t� o f ":r � t.r �t th ,3 lo·;,.,:;r end o f' th .: cha:-�: ::; l f•ni p�ovidc
smoo th no�-· in tho trr r. sition �nd uptJer rc ricP•1 s o f t:·: c ! incli!l-.; d shr, ft.
( '5 ) Thnt the curve rrorr. th') ch!3nn, ;l to the ir_:::1 1� .-:ic sl: aft must
be flatter then thuorc t icel considcra tior..s · ·ould :. ictet ,� in o::--dor to
provide set i.sf�ctor�r co ndi t icn of flo·;; in t�10 incline:c. .she ft end ver
t ical bend At tli.::: hotto� of th :. sh aft .
(h ) Th � i t , TThiltJ th0 olJovo conditions ··· 1 11 -pro due� r-. fl C t i.sf�ctory
co:-idition o f flo··· , r a ffln c in the ch ar.nel nroi:luce a ·. ·orthr·'!'lill� ir.i
provomant .
9
( I
r :I
I (
1/'-···:-··r'-\
\ ··-.·�-"···, .,__
Bock(1/l /0 i � 1?37.?,.··
� ,:., ,_
L= Ur----1U�- -O-
EmNatt to E1tv //75.0
� ... -\,"" _,,"' ' ,
Elev 1?3? Q•?OQOOOs r Elev 1?79 Q• 31,500 s f
Elev /175
PLAN
.JIS.
., ... _,__ ---.. lff ..
-----_lff_
.-'fl.
JJl.
-ffl-
'A
of linino · fl l'l37.0
,---------------,.-_ ... ,
a..,, I
--- ------
i,c;J- 60' • 36' .:. 39' � • 1,( •
SECTION ON � - i.t .
Horrzonfa/ Bend
�Cl:
• J?' ,
• 26··
• 1.4.9' • . ,a,·
81.1'
Elev. 6.32.865 __5•. 003296
·o .,,
5111/l·.1."J,· Ptuq
� fi [
- 60. s· -I,()' -
Sl!CTION A·A
·o,
SECTION l!-1!
Elev 1737
·...,
,:_Q.· 1.'\?
Elev 1175 �
'.'3
• 567' • Sl!CTION F·F
J, ,,p 1 • r- . Q, J i
[/ 1110
5 6 1e s · - i.o· -
Sl!CTION l!J·tJ
778 ·l8<i-
Q> r
•• r
� }' ' " . (,
� -:
· · 56' SECTION C · C
-.. r
r
,,
Sl!CTION O·O
C, '
� o � ..:t
� \3tJ · ® ® <0 N t:11..: '.:1 rj:,'i>-;... si,�;._ � ..;i .._ , , :::, /10311. fl 9114
E/10575 \:If ®·Bl
100
!,O
SECTION G-6 :Sl!CTION H·H
.,,._ 100· -11·- 100· _,,.. Etev 771.l, m
Elev tl}-7.0
fl ffl fil II
Sl!CTION J·J
100·
""' Sl!CTION INC RCTION L-C.
', ,
,,--------' ' '
FRONT ELl!!.VATION - .J .... .... .... ,,/ '
I
... .... ,.,,1
0 IO l00 M 1C0
Sccle ·,n feel
:j·
0 10
',J
OC�l!N"T OIi' ,,.,.. IN"T'Sltt�
euRaAAJ 01" ,_CLAUATtON
eov�O�R CANYON PRO��CT
HO OVER DAM GENERAL PL4f'I AND Sl!CTIONS
ARIZONA SPl�Y
�� .J. a * .,..,.,..c•o C._M. c,.,ac.#r,O
-� ,._COllifWaNOCO -
C>a'NVW' ... C"OLO.
� )( H I BIT I
�
l2tJD•. IZU-.
CLJJDO<r·\
Cl.I/Ill.ft"·,
C/.l�O·· .•
.··vround surface on ( '--y··
PL AN
\_ Ar . -_''--A-�-� - -Ll-.. -n:Zo�4 g
A
BI� C
r> >·1-�
e-o ,-- - - r:,,.
I I
-----............�
1o· M,n 24.A.e
Ct 124'.0··., 0. 200.ooo c r s £L 1231. o···,-_ ... -�
Q•J/,500 C t• S r/. /119.0 · ·�/./20,. 4·· .•
Concrete ptuq r - - - - - - --- ---11----
: · ' -.t , ,
... l-4 � -�
0'F' _.,.
0 ,O· M,n. � 24" Ave. ··.
\ "f.··c, 111;0.o ··
- • -1 I I + ·
---r--1ZJJ.z·
111' • JB..,'j .. � I � 64 7' •
EL 1275.0 · .•
SEC'TION A-A
SE:C TION C - C SE:CTION O - O SECTION E -E
;JJ, ,�fi----
POR-rAL SECTION
I' ··· ·�···· ···--! : . : . .a,rl,. . ·····m; .. : - i . . .l, • ·_:,..
. . . · H'llin.
,; .
-� ·� ... .. LL. . .�.�, . . � · ·Jl.7'· �
S£CTION ,_,,.
·B C
- � � -SECTION ON C.
: . . . 100 ' _,,; ,uo ' •II � ,<JV'
� � ""'' '"""' �
I 1,,!cJ <.rt!Sf
I I /Ill I, r 11205 .,
Q - ::i
801 tom 111' , l"mn,·1
� � .... , , ,· · ,
FRONT ELEVATION
.,, ;
� :J
OIi - )6 ' - J9' - 4/ '
IVV'
.F:1
· , 11.·:, .1 .
. ! I ::. . ,.., ·rt·
("i
..., ... ,
-�-<,..(' X· .. 1,1� .. . .......<. � • ]7' • " [t /000.0 ,
• ?6' -
"'
·:- '+",/\, .. 1 1 984.5 \
-f-�� �"'-'
' � ,, "� � <:-. ,,
--;.i T '(
�. "'q,�
ti !IOU 0
(JJj'
l f t'JVvV
.,,. ·�.\; ' "-·'
"-.
71.0:
. �-,a,, '
. · � J'O·Mm
o • . · � · - - 4t.O•Avt.
;:: � � � � �· • • '. : ,.-"[/ 1083.0
,,, o· • SECTION G - G
,., ""'
� 67, lf
�
· &1· · · 47' :
. <;}. I\ <:> • • � • J'O'M,n. �"< � :, '-'O'A.., .
:S! o. , , . , "(/ /057.5
· .ua· •
SE:CTION 1-1-1-1
• tc •• .�. ,. , . I :•1 '�
e:, ..... ' """ "� ·"' "__."- t L ;. ,,, , , . .. ,
'�
· -·-� -� -.a...;· .. �===-===9
:i:
'
.
')1'· 1 1, 1
\,-;.,.,.,.(.�,-, f ,..
· ·, • r ·, •t/
-r-r r '"\-.. ,,.--,""'7
ltt'. 1J
�...,:., ..
0 .. -� ·2 "• Av• ,..., ·.f/./OJJ.4
SECTION J - J
1 1
e z••' """ . ,, .. ,..,. :!�.972.4
0 4•tlit' ·�--·:r�m,
SECTION K - K S£C'TION L -L.
ocµAR�MFN T or THC INT«,:,,�
auu�Au or R�CLA4oMTION
BOuLD�A CANYON PROJECT
HOOVE/:1 DAM GENERAL PLAN ANO S£CTIONS
\ NEVADA SPILLWAY
,_,.,.�io ,. '" t. c,.,.r"'"
.3,v•..,rrco IH'CO-...WIWJCO ··�1:0
'-tN,tll • .:Ot.Q. O�· I � 11J1
E X H \ 6\T 2.
t.5-D-AJC)
<-.. _
•
. �----. .
l •, I
' I ' I,
' •,
/
'ir . . ' '
. ....
t�
t I
• I
' .
' � � I '
.... . ..
·-.. ,.•.t.-�
. .,,
'\ ..
......
.... t � � '--
. ··1 � �
.. .
� "" __
._
..
I -
•
r-�
.••.
. -::10
4!.
:·
::�
, ... :__ I .
,. .,: . .
C •
.
� �
," �
·" \ •
-{ �
' '· --
"' .,.
. ,
;, . ' � .. ; : . .. �-
'-----------
.; I
�·
�
A
• ..,
If
•
t , ...
/ ·1· ·-··.
' r ,
..
/:_,
,.
,'
\
' ....
\ \ .,
;
I
I t �-,, I
� < ·•
� . . .
<;_i_
�
i .,,.�
' I
I
I
I I
e; ·" . ..;
1 ' i I •.
I'. I I I I I \
, ... ' . ' J
' .
\, l
' .
... t ·H
-
h I
\\
. ' .
'.
/ !
-'.;
-:, '. : .
: ... ', ...
, .... \
,. . .. I• ... )
·.
<
.... -I � I • I
. It<) I
t-I
[Q
T
X
LL
'-1
.·-i
..
r-------Varies from ,
/2.5 ' to 9. 7
Varies from
�
,· - · . 4 ' to I I ' · · · - - -
- . .... , I -'· . -
er, ' · - , >( '
� I
PLAN
"ts '"ts C: C: a., cu
L.. 'cu Q)
& � :::, �
<f
. , , , . ,... 9 t# • , ' I
I.
� S '� A t upsfreom end of channel. � lz' �At downstream end of channel.
TYPICAL Cl?OSS - SECTION
'J - \.)
C)EPARrM�NT or THC llflflllOR BUR�AU OF REC L AMA TION
BOUL DER CANYON PROJECT - HOOVER DA M
CHA NNEL BAFFLES ANO SILL FO/1 DRUM GA TE SPILL WAYS
DRAWN. 11..-kP. _ . . . 3U8 ·t" 'T Tr n Tl?ACCD ()( B . . . 'fff"Olfl-,fE "'J."'f:D . O�f"rl<CD . • . AP,._.,,.,, , � ·�p
[)en�r . - �.,,"" (\'-' f; _ •a ? 1 14,-D-1446 E X H \ B 1 i 4
43-A-0 . Set-up . 43-A-5 , Flow 40, 000 c . f . s .
43-A-3 , Flow 120, 000 c . f . s . 43-A-l . Flow 200, 000 c . f . s .
Model of Design Shown by Exhibits 1 and 2 . (Fort Collins - Scale l : 60 ) PLATE 1 .
l.4
44-A-0 . Set-up�
44-A-3 . Flow l20,000 c . f . s .
44-A-5. Flow 40, 000 c . f . s .
44-A-l. Flow 200 , 000 o . f . s .
Model .of Design Shown by Exhibits 1 and 2 . Modified by Baffles in Channel
(Fort Collins - Scale 1 :60 )
15
PLATE 2 .
.":\
• •
. .. �
-�
'
.\
TABLE II
IDOVER DAM
00 ST· AN!> QUA�JTITY ?.STI!-fA 1'E
SI'l! � SPILLWAYS
nHIBITS 1 Alm 2 o
• • �Olnto· :U. S. =�--�}!evef!� ____ : Arizor.� !'c>. : Item :Cost :Cost · : Q.uant iiY� ·CA:>st :�;r.ti tz : --Coct
: : 12 · :Ezeevrtion,open cut : )!.60 13 :Excavation, tunnel : 8.20 39 :Drilling & grouting:
. . . "' • ·I -: :
. : . . 305 , 555 : ) ,. : 51 , 959 : : :
: for enchor bers z 1.00 : -- . : 9 ,490.: 56 :Ooncret� crest 1llo35 : 3 065 : 21,660 : 58 :Concrete lining :10.00 : 3 .65 : 12,016 :
. 56 · :Cona.rct� ·dPm ·:l0o0C : 3.65 _: 810 : ';fl : � - �l lini�:l0 o00 : 4.30 : 10 ,�l : 73 :Beintorc� be�s :Oo007� : 0.03 :2 , 116�000 : 74 :l:D�� bars · :0�02 : 0.03 : 61. 100: - :Drum gatoa :
• . . . . . . . . . . . .
. .
'194 ) 443 : 426 ,064 :
:
282 ,650: 66 ,844 : . .
9 ,430 : 7 ,�46 : 324 ,900 : 20 ,550 : 164 ,019 : 8 ,8Al ; ll..05� : l� ,558 :
15411883 : 13 , 120 :. 79 .350.: 2 , 353 , 678 : 3.,055: 51 ,450 :
277 , 200-:
. . . .
' '134 ,890
548 ,121
7 ,946 308 ,400 121 ,226 185,06'1 18'1 , Glo 88,263
2 ,5'12 27'7 ,200
'IOTA!. FIELD <DST . . . . . . :� ,244., 460: : � , 461 , 301 : : !
•
D�TA!T� R� RT
1 8. Geoloficr. l ex�·;1 ir.et i.ons. Th� sp i l l·:. �:, s tt e s were exsm
i ned by Dr. ?. t . Rr; nsorna , consult ing �eol0 ,;i £�. Of tr.e Keir1;1dn si te,
Dr. Ransone sai1 :
" The s"l".li J.l -;1c:, ::- on the }Tev-r.Jds s id e 11re sen� s no r;r-;o lop i cal d i f
f i cul t i �s w�:ste:ver ar.d �·:ill b•a in har1 , �t ro::11! ro e :-: , p:rri ct i cally
e ll in lat ite flo " �re ccia ."
�1th re gard to the loc at ion on the Ar i zona si d ,J , shown in
�hib i t 5 , Dr. R�nsome eeys, in h is report o f �ob�u5ry 14 , 1931 :
" 1'ho �dolo�y w�s m,.1p-pad in a tseneral '?'r,y (Exh ib i t 5 ) on the ·
to po�cphy ontl eo�e sect ions wore M� d � (Exhih i t 8 ) . Th� spi llwcy
w ill cr0 es two fm:lt s , r.ut th0se , l i ku ot!'le:.r rf'. �11 t s in t�o c� nyon ,
h evo lon� sin e,� ce; as-.;d to move , contA in nu soft o:ougd , and should
c auso no t rouble . The .v.enorn l d ip of th\3 t rc::cc i f.:B !ind o r some
sud imontery beds r-sso c l ,,ted ,1 1th th,.m is .southc�storl:,. At the
south t)nd of th� S'!) ill,:-,r.y th-J d ip is from 15° to 20° . Nof:'r the
north ��d 1 t i a r·bout 400 ."
In hi o report o f 1 'nr ch 3:1 , l��>l , ho tJny� :
" Th·u 1"'�lor.: iccl etructuro is m-..ich r::Ol'(:- oornplex thr,n I ha d ·
,:int i cip"1t .: d . F�ul � � e �o nuu..:lrous Jln d in mr:: ny plf; ces d i ff i cul t
to truco owin.;,; to thr.: t opogrtrihic cond i t iona en� t ho 1 ,J c!� o f
contrr.st b�tv:-0� n th·; VArious rocks involv�d . Fortunetoly t he
faults er� ell 011 and conta in no so ft gougo . The or i �innl
crushed rock elonF. thorn hes boon cume n.tod to ro ck thc:t is prac-
17
- · ....,.
l"1 )(
-1 (It
•
� " �"'"'" ------
Note :- Geoloq y from ske tches by Dr F L. Ransome with report oF February /4, 193/.
DEPARTMENT OF" THE INT�RIOR BUREAU OF R£CLA/IIIATION
BOUL.OEt::l CANYON PRO.JE:CT
HOOVER OAM GEOLOGY AT ORIGINAL ARIZONA SPILLWAY SITE
DRAWN: H.L..0. SUBMITTED :
TRA.C�O: PM.W R£'COMMENDED:
CHECKED: APPROVED:
0£NV£A . COLO OCT. 19, 193I
EXHIBIT 6
£.' . . ' /50
£/. l JtYJ
C- / I f:;() � . 1.._,,
.1
� 50 'x 8J' s•,ney � r;-�2 :... ':fyou,1._ - -
� t. (/) 0 c- Q_ D (\) Lt:. n-t+I
A NDES/ TE OR
LA T/ TE
PL O W B R£CCIA
BASA LT ·
� , '-"'
,::-- ' ! � ,., ,, - .,, .,,
c:- · · � I"'.., _, ..,· ..I
:'2 50
250
. : 20 �
, - I"\ --
. · 5 k e"-: ':e c by I ,-.
r"' � I ::;,...,.,� ,,.. ......,e
- ' · - · , .,, , - 'i...11 '
' .'5J
. "' .' .'51}
S E. CT/ ON A-A
�er�e ... ol dip "·
� · .' 25�
� - · : "I ,.-, - , .... .J >w/
ti ,
l {') �-lf 1 �-(__ 0 t-i. Q ct �
BA SA L T . . ' (lJ
-h
C'.> t!:J co )(' >-...._ ' ' . :J C ) �- 0
12 Q()
' \(') C. :;:.... BRECCA� " � � �
� -
,' /50 '- 0 �. ' .:.:>� '"' v . .L o_.,
JL ..........,s�e�
� _s.<1 ��-s � .,s "- 8y
€-'��-<t
<.N, . · t? ... -v . ��., / .,(_ .... �·v · "?
FL O W 8 R£CCIA "'- -�-- "= " · ·1 . �
"' .r "r")f .... ,-f r:: '-� �,.1--"..1 , ._, ._. • ..,1 "" _, /1'{ C - 4 _ '.,I by F.!... .R
S E C TI O N B-B
Ge ,..,2 re: /
' E.'. ' 'J5J
"C ANDES/Tc OR LAT/TE �
FL OW BRECCIA � • • • • - • • I E:
0 � 'O > t::'
f � Q b,I
V) '--
>a,
�-� \/) · ::::s
BASAL T .
- 0 (:') >-
b -0: � - tl \.-'\\ C: )( -0 � - - <:'> * - - - -- -
-t! Q> '° -e' L o (,jl ts � :t:: �\._..,
"" :·Acftra I �ontacf - - J Bcrsa I�
�. .. El. 1041. 6 l Bre cc,a
SECT/ ON C·C
No te : Geoloqy f'ro m repor fs by F L . Ran som, Fe brua ry Iii-, 1931, and Ma rch 3 0, /931.
::)�PA RT"'VIENT OF THE INTl! RTOR
s u q E 4 U OF R l! C L A MATION
For locaft'on of c .r-oss - sec tions , see Exh ,.b i f 5 .
BOUL D E R CANYON PROJ ECT HO O V E R DAM
GEOL O G Y Ai ARIZONA SPILLWAY
��A'N N " R L Q. SLJBM IT'T'�:::, · . - • . . . . . -rqA C E.c' : E. WO- LDBREC OMMCNDED: . .
'= � E ': 1-< � 0 : A PPR0Vl£ D : . . . . . .
C' 6 "w vEt:I. COL O. OCT: lft, 193' 145•lr.1459
E X H I B I T 6
,'
f
tic�lly es hard �e t�e unfrectured rock o f tho feult w�lls . No
fault w�s aeon t�ot is likel� to �ivc any trouble in connection
with d�m , spill�cys or tyn�6la ." , 1
"Bas-�lt is more ebundent thon had b':3 .lD supposod . This rock
is plainly intruE-ive end is likely to be found almost anywhere
in �rilling . It has b�an injoctod along faults , ��d in places
forms 1rr3gular bodies of conaidoroble size ."
"Tho r.?�in c 1.!estion with referonc9 to the Ar izonr spillwey
is whcth·3r t!lo roc 't "'hich � 111 form the 11ost side of tho spill
�ay �111 be strong anough to �ithst�nd the pr3ssur& of a fUll
res.)rvo ir ep:') inst en empt!' spill\'7ay. Concerning tho rock �hioh
in rny r1.�-port o f February 14 I cell,)d • coerso andcsite or lnt ite
breccin, ' I hevo no mis�ivings . The mctarial ie strong �nd the
bednin� -;>l�nus , '31 though they qip into th:J spillr.ey , aro of such
charcc tcr as to r�ndor slipuin� along thoM highly improbstlo .
Tha r.iost r\oubtful f'8r.:tur-� of the ...-,u ir rim is th·� ""JT•::s2nC{; of tho
basalt. "lh0tl".er thr: urroor surface of this bas�lt 1S t"?Vlm and
dips in �em�rel confornity 1:1 ith th�-=- ovorlyin� coarse br�ccia is
not o t pr.-Jsent ,k tcrminPblc. If this cont ect is a Br.10oth plane
and em�r�-3s in tho spill�r:-Ay a short dist�nco ebovo th.J bottom
of t�., tr :mch , t!".:-1r;:; !'light be more de:-iger of the �hole r.iass of
the ..-:oir rim slip!)in� into tho spill,:;ey along this contact then
�long th� visible t �dding planos in tho coarse breccia ."
In a l�tt�r d6tod June 25 , 1931 , Dr. Bensome says :
20
•
(
" I should l ike to see the contact es deter.Mined by hole No .
1 plotted o n section C-C (Exhibit 6 ) o f my ori�inel rel)Ort . The
easterl�, inclinet io.,_ o r the �ock V'OUld have to be steep , cert9inly
over 45 degrees , to erouse any epprehe�s ion of a sliding of the
rock forming the spillwry r.all into the spillway cut ."
It w ill be noted on section C-C , that i f t�e contact is e strei�t
line from the point or contRct in the . drill hole to the visible con
tact .on the face of the cliff , the angle is ebout 45 degrees.
The construct ion en�ineer was then not ified to consult with
Dr . Hansome concerning the present locat ion of the spillway. In tel
e�am of 7une 29 , 1931 , he advised that this site would be in volcanic
breccie upstrea� ana flow breccia �ownstrearn of e fault in the drew.
This fault crosses the s�illwey near the lower end . Dr. Ransome stated
that if the snillwcy were moved about 150 feet upstream from its pres
ent locat ion , the crossin� of the fault would be avoided ; ·that he did
not regard the presence of the fault es e serious ob 1eotion, but would
prefer to avo id i t i f this d id not entail dec i�ed disedvanta�s in
other respects ; th�t no greet exponse should be incurred to avoid this
fault .
Sines heavy ex�ense would be involved 1n evoidi� this taUlt ,
and s ince , if the spillway were placed as sug�estad by Dr. Ransome ,
the fault would st ill be crossed by tho shaft , the present locet ion
wee adopted .
81 I,
\
(
. .
\_
•
Det� iled lo�s of two holes sre sho"!'Il on the following
pr�'?;eS ; the locstions of the holos are sho'1n on Exhibit 5. Tha
crest elevation of the spillwey was st elevation 1221 . 3 end the
bottom of th� chan�el from alevation 1099 to elevntion 1141. The
"remerks" in t!la lo� concerning the rock ovar thi s rangu ere not
such as to inspira confidence .
22
)
PLACK CAX'it>N D (HOOVER ) DMrSIT'.l:
Hole #2 , Arizona Spill .. ''3 Y.
P. &. w. Go-Ordinet�s, N. 2� , 963 , ry_ 40 , 164.
�10·.pation at COlla� , 1265. 0
: Ssa no t f!d !)RII.LING 1"::00hD : : for core di�
ELEVATION : D:-W7.: F::£:Y1 : Clnssi -z"i- : llr.'Jte::- Ft��ARKS : O')f.I, .. ;r - ..:i .�·�·r : cation. = ��7:r--�--�
---,�,---------
From : To :From : �
1265.0 : 1228. J : C 1228.0 : 121?. 0 : 3?
3? 48
121?. 0 : 1184. Q : 48 : 81 1184. 0 : ll?O.O : 81 : 95 1170. 0 : 1151. 5 : 95 : llZ. 5 . . . . . . 1151 . 5 : 1124. 0 : 113. 5 : 141. 0 1124. 0 : 1110. 0 :141.0 : 155. 0
1110.0 : 1098. 0 : lBG. 0 :1�7. 0 1 q99. 0 : 1088 • 5 : 1 t) 7 • '.J : 1? 6 • 5 1088. 5 : 10?3. J : 176. � : 1�2.0 1O?3. O : 1013. O : 1J2. O : 232.0 1013. 0 : 1008. 0 : 252. 0 :23?. 0
Brec�ie "
" tt
tt
" "
" " " "
PasAlt
Tot tJl c·:, r-:: r ··:. c'J �,ery
NO�S :-
2? . f• : ?4 . 3 : 9. 5 : P6. 4 :Brokcm t· soEimy·. Lost w�tdr
: nt 42 foe t. Ccmo�ted hole :& lost water ogoin at 4? : feet.
23. 5 : 71. 2 : 9 . 5 : 07 .8 :Proken. Lost water at 109. · 7. 5 : 4O. 5 : Cerr.ent�n hole & lost it
= ��nir. nt 113. 5. 14. C : �O. ? :�e irly solid. 4. 5 : 02. l : Soft & bro �en. Lost water
: �t 146 ft. c��ented hole : and recovJr�d wat �r.
5. 5 : 4'). e : Fairly solid. 3. 5 : 36. 8 : Soft and b rokon. 7 . c : 45 . 2 :
lJ. O : 31. 7 : Soft & bMk�n. 3.0 : 100. J : C�ntact et 252. 0. Tight
: seer.l. !To loss of water.
: 1Z5.0 : �,;> 0 . '-" •.J • • •
Th is hole was dr illo i with "r-x" e �·ui�nent to depth 60 fee t in the endeavor to se ·��ir� r.ioru core , an1 W'ls cas3d w 1th "E" casing to 6Ofoot depth. BQlo� th� rJ-foot de?th drillin� we s carried on with �E" equipment. Sizu o r cora 15/18" dieme tor.
Cor-:!S � :;re exar.iined by Dr. F. !,. R'1-nsom:3 t'ind Fie ld �ru�ine\lr Lowry on June �5 , Hi�l. Contact between braccia and basalt was determined by Dr. RAnsome a fter '!)CrsonAl e3xnminsti,:>n.
23
PLAC�: CA: ryo : 1 - D ( HDQ"lER ) ::::):V ·3��
P . ;.1. r-,, . Co -O rti iriates , N. 30 , 272 , W. 49 , 012 . Ho le #1 , Ar i zo na Sp i l lw�y . El� v � t 1 Jn a t �o l l ar , 12?9 . 6 .
fXi ?.E 1�)71G" � DR ILLING R�CO ?:) : D":.'Yr..:�r{
EL�VATIO N : D�?r: ��F.' : Sl e s s i fi - : .¼::m ·.'-.. Y: P.:S: :.�F. ;-:s : OJ LL;B-?�� : c e t io�
�F .... r_o_m--:-... T�o--: Fro;11 ]'o
1 2?9 . ei : 1n32 . f) : n
1232 . 6 = 1208 . F : 47 12os . n : 11 9 4 . r, : ? l
4? :.t.n 1es i te : t re c c i �
? l : - H t to --Rb "
1 194 . f : llBl . 6 : 85 : 98 : �re �c i � 1181 . 6 : 11 ? 9 . o : 98 : l DO " 1 1 ?9 . � : l l6G . l : 1O0 : 1 13 . f : " 1166 . 1 : 1151 . � : 1 13 . 5 : 129 "
1 151 . 6 : 1 148 . B : 1�2 : 17 J
1 1 4-0 . f- : 113:� . o : 13 3 : 14,';
11� 3 . 6 : 1 12 9 . � : 1 4- � : 15 1 112f2 J, : l09 r', . l : l ;, 1 : le, : . ;: : 109 6 . 1 : l08'J . fi : 1�::: . ;i : 19() . 0 : 1oe;? . r-. : 100;� . ,: : 1 90 : ? 1(, 10f3 . f : 10 58 . � : 8 1 6 : 32 ? 1052 . � : 1041 . 5 : 22 7 • "> .. �J . -�·. · · ·�'
"
"
" " " " " "
l04 l . 6 : 1C 3 1 . 6 : 2�2 . "'.) . ;) - - �· ·J : (�} · 5: "
: l · :� s r. l ""� 102 1 . r : 1022 . G : 2 48 = ��7 : - � i � ta - -
:r'e e t :
2?, . O : 4C . 8 : So ft. .0• bro ken eore gri nds : up .
19 . 0 : n . 1 l(J . 5 : ? �5 . 0 = So !'t & hro � :en ver t i ca l
: '1 /8'' D i s . core : s 3L=-:- s . 7 . o : 53 .8 : So l i .j hu t ½ u i te so ft . D . 5 : 2 �1 . O : Hnr1 hut bro lrnn .
: 12 . 1? : 3:J . l : ttri rd ··n:1 so l. i d fS . O : 3,1 . 5 : !):) :'t �- · sef:i : r; . Lo st w ri t er
: l?.: . :s to 1 2�� . Hr� ,, n l i t t le : re t u:-n �rt 12 ? . F! .. 0!". 1 1 ? to : 1� ·1 so ft t re c c ir- 0 f �reen: i �h co lo� . Re co vered 5 : i �ct�s o f core .
3 . 75 : �4 . 1 :F� ! � retu�n �·m t er 222 to
- ( I '-c • \ .,;
: 1;�CJ . Le s t w � t e r �:t 13C . No :o-:,en t-;e,,.! � ev i r� �n t .
5? . l : SJ f � � n 1 �ro k�n but �e t t i n� : h : ;� -·:.ar . r-.ro cl: nnse i n forr.:o -: t i -·m .
1 . · ! � : 28 . � : F:; : r l : · sv l F . F, . o � 49 .. 2 : S:> ::'t · :nd 1-' ro ken .
,.., • 5 : l(f) � �! • :;f.) l i 1 . 12 .. o ; 4,�, . �� : .::., !' t ,ma bro �=�m .
J . 0 : e 1 . s : S:)� i i . 7 , . • . •' .
(!, . j �
n� _, t.
� - , ' n .. • �
. ' . :.> : f : l
: 3<? ":· . �.r . : ·r. te!' i ,.; l i s somewha t : � · : �· ke -:- in co la !' b·1 t s ame � � � - r � cter es aho�e . : 3') .:"' t r .r.� b ro ��n .
1'o 4; ·1 l c0 :-e ::·e c ·_; ·.�e: · :r : 14-'; ,'§7�: f 7 . 5
ND �G : -!io le was c �0.�r t�a :°"?·or'1 100 fee t t o 14!1 f-ee t o n � c count o f lo s in�
wr. t er . No '.''a t or lo st r� ft P.:r- d r i l l i n r, out c emen t .
ron t a c t h � t·'l ..... ('n t l1 � 1' re c c i n �nd th·.) l · o s nl t ·,7P t. N'B cheii At a dc..,th o f 23G fee t r 1 0.l0 ·11 t '1'.J c·o l l-� ; J' . Co nt a c t id ent i f i an � d rl r 'Jth detr;?r:� inod by· 1,!e s s rs . Yo unt; f, �� S-: :1e le . Th i s ho le w� s dr i lled -.v i � ?1 "E" e q ui pr�ent .
24 •
1 J • TT s c o f r-r. : � � • ! t t s no t "1 r a c t i c � b 1 c , ._ .. i t : o , r'; tr. e use n r .n:�· t .� s , to .,,r,J ·: i. :L 1
:1 · : · ·1 · . : � t t ncr-o !--. P. ,; i n c � i ri ''l l� i "':,:, re ,-. · 1 i r : ri ( 10 1 , 5�).C, sc � -
o �·i - !'c(! t ) ·.·: i �, :-- � :-;l : .• +. � t'. r · ,. - foo t r i G(' �!"'. · ·: � · : .;:?' :J ' "r �.'r c � a l �.:H:o:: 1J l : · .
2 . : . 3to � �::: r:· � -� " " i t �1 � :d ,_; (� � . !1�·. - -; l . ��c f"rJl lo·· i n ·� t : . . r lv
thor; s ·1nr lou 3 C J!"'.l' i :· !_ : 10 ·;1 f.' , r l l o f '.': ; 1 t c : 1 :_---r ; ·J i 'i .:. t, � .t.: :-c ,., u i�cd c n pn c i t y
,,1 th ·•:f: t ·.Jr s · r -·· f r;c0 • t ,:. l · .. ·n• + . .:.o n 1 2.:2 .
T.:�9LE I II
:.>c s � .. � � :� �·c 1 · S i · 1 �: Cr. �n�cl · - - i +:L "H.:) '10,: .' G �· t c .
: lC:lt;th. :-1--;�.n 1· ' '. �T - ;[! ti.:_ Up 8 f ' · -, .:_ 2_ J. ;r: :. n . .; - P ' · � , ' S rlo .,.. S i ze : Fi x -� 1 : Cr ·�. s t : 1-· t -.: : ··· . s . ot 12:�2 Q ry_ S . �! t v . for Got c : 2r � t :El ·; . : Si l l "
'( Q : f'or . . • � . ..... . . Q. ...,. r<· :·).,.>0 : :S :!. ' V • : ''; ' t J : � r � St !
5Ox8C : -�(JO : � �:i_ ; . 0 : :!.1 : · :1 . ··. : 1�50C :) : " �1000 : �C'C : 12 � �- . · i : l l -� :) • � : 122<;00 : 78CJCO : t)00 : 1:�� 1 . -· : 2. L l . f : 12YJGU : SO,-)CJO :
r.-�,�eo : 1iJ· o : rn�(·· . � : 1 � -i o . 2 : 1�5co0 : f, .--sooo : '.J08 : 1 �·? 1 . �� : 1 : .-: 1 . r· : 1:--20 110 : r-8000 : 007 : 1�2 2 . 5 : 1 1�� - � = l� �coo : �oooa : . . . . . .
r oxec : ( 1 ) � :J _; : B�l . �� : 1 !. � 1 . � · : 1.. - � : >000 : � > ;-3000 : J)J : 1 ·�� � . ;) : l :'..· :� • .-:: : ".. :-1 )()0 : ::-i90(J0 : f/., :J : lW? � • . ; : 1 L:5 . -� : :: . £>J00 : filOOrJ : 7UO : 1�2 .� . � : lh- , . 1 : lY' ·..,co : t�3.)CO :
( 1 ) Sho· :n -:>n �:v:\.- 1 · , i t , .
12� ()
EOJ ::-' : > l , :1Q J :J 1: 10')�)0
�8 -)f) :') qq, _·, r1 ··, :\-:; J.· , )
7 : ·XJ J '7l j: 1 J 1 ', 1 ' ):J =; . · 0'91 ·· , ,-;
1�2 ,; . 1 l"2r . • ? 122 7 . 2
l '1. ?, ? - � 1� 2 7 . r; 1�2P . O
l .. , r, � •:; � • • t...
l��? ') . f 1..,2 ,? . [ 122 J . C
-�11 - �'J . · .: · :.!:r ..... io: : .., . ,. , : fi O �- y 8G- fa J t • 1 ·· t .) 'i: i t. � . . ; :)J - foo t fixed
c r-3 st · r: ::-, E ; � :; ,-:> � ·�: 1 fr.: :-· s �; : . . � :i -:nc� d ·.; s i c-:ns ·::0� · :J :•r.:, :· !':rcd {:Sxl-: i b i t 3 ) .
F'J r c co n.)r i � !" .; '='. S :J "."' S �� - -� t J ..., ) :' t?--. : : "':f, t · · · · 1 .s :Jl '"' c c. d c-. t t ! • -.,:; e h:vn t i o n
o f t h -� f i:-: 0 1 cr :: s t . l.� s · . • r-1 i::1� tha-+; t : tG 7 "' t , : ·:· J u l 5. r -. �r L in (! lo se rl un t i l
t hC? �"1 n to'!" s · :r r·1 c ,:. 1·::- �a.! ,...· u:l ·:� 1 : , va t io n 122� , t �� -:- c i s c h: i r�e o ·l . 'r � u ch u:1-
co:itro ll ,d. cr...-! st ·_70ulf b, , 3 7 , 000 st.: co nd- fe•.:.1 t: • .At !:: ... x irnn� l.! �''V.: c i t :V ,
25
w i th o;a te full:, r r:i i E"e<i , tre '.'! i s ch er �e t hrou r,,h each ,sr- t e wo 1.! l i he
145 , 000 se co n d- fe�t n r � 0ver e n ch fixe1 cr� s t 35 , 000 second - fee t .
The WG t er WB S '_\ S S i.l!"'':' �, to .-:·o t:1;'0 U ... h t �:e '""." "' �e "" t �. :1e r)e �th corre spond -
i n g to m ax i mum d i s ch ,:,rp-� . 'I'h i s rel'.' u ire s t! �o n !=' :. .for � � l e drop i n wa ter
sur face bet··,e --:.n t �1 '� : r 1:e t1'!'!d. t he ;?r. te , re su:: : :-.� i n c lvw ·.·m t er sur-
fnce i n t � � c� �:i :;a :. , r:1--:. i ch :-- e s� 1 l t � in co � s : d e r n t le ':?r. e:'r:y o f era s �
flov: o r tL e ·;m t. e r en te;r- ina 'J Yer the f ixe<l cres t . 1. ]� i -�e� \�· ,.., � e r
su:rf8ce ,) i t � e:r · ,0 ·11 :� r·< d llC' ') t :,e 1 i s chor £1'.c t \.. r·o �r,:h t h(· F?r> ta , o :" •:1ould
depend on rdc0v �ry o ; o �o n r i j ora�le part � r th3 ve loc i t y hc � <l in
t'1o s i d e c h rmn0l . 1'. h i t".' : n . r r.cn t f3 "'.'3 o f r . : ,�ov .-;ry �,•.1 ou 1a 'be rix ,.�r.s ivc
o n a c � '.)U� t ':i �· -+:. :>-�- r. i ·: . ·,, .. l·:. d ::, rmr� t h :� '"' !'O '!°' r,"r l-.; .: f: .. :. c t of t�e i n fl'JW
0 ·1 ·: ·r t h· f L'. •; ·� e r . 0t . A r·ur! , ... c ,:-d r:H s chorr.:0 t:1 :1o u�h t !-• ..:.: ge t t.: ···(mld
r ,J o u i r...: ,._; i t l1 .r ;.. ' l · :r -d· �rrt � , ·,·:'1 i ch e lr, · " rl :r r:-;:-- . .; o tly 2 x c . u dod nre.ce -
d en t i n s i ze ; o :r � l , n£-�r � re st .. , , , i ch -rm t: l ,i o:r0 r. t J. y i n c�"e sse the
,:, 11nP. t i t y o f P.X c �v:.:i t io r: rP-· u i red o n a c co u:: t ') ; t h e unfr,vo rd' l� to:,o o:-
J" ::! ".lhy , -·� � i +: "'ri � t � 1 0 1 : ,...� � i ::. · � ·, i sn �' l e to �m·ve t l : -. c · · · r.�vu t:o f i � t�t e
�r-, 11n4 cor. t ·rn .:-- 2 ; " v: ev, c·a "1 l ° i !"�:e .j by t �� ·- .o :1 � i t 1."! S t s .
,., ., "" -'- . � .. :,.� ·. ·� l "t ':? � +: f) • .\ mo iel o f ti·. i :.. -i f; � � .::n t :) u s c o lo o f
1 : f>O .. , r . r:: r. ·1 i : t r � .� -t i• :-- t. r� .� , .. , For t Co ll i '.'1 s . 'I'; �e � ro. -.� i t io :i , 1 0 ,·;n to
th n. �o i ;l t ._,. · ' •J r 9 i t r:) i ·� 'J :1 t : ; e �jC -foo t si : · · ft .. , �I �-: 0 r 1 t•:;J i �. ft t �a '.'.'OO ·:� .
T' --:- s � 1 r: f t �1 :l:, - - t · · t ... IQ i r: t , t : 1� ver t i c �11 1 :t:�r . .i , � "1c1 t t e t un:1el below
t-, .�:re o f t :' ': � s, --· r-:-·1 � T\ TD l i n . !t 'i.' r- s fo 1mri t h · : t · · i":�. vc � ·c :"r·:o 1 o n the
r i "".h t S i 'k '>f t �1 � e> · .... :, ·· l '� t: the c u!"vc l1 .�· lm·1 t :' •.! --:o c ·� , �.,J 1 i ,'!h . . .,r· s ro-
fl.J c t �d h n e ·-: rn � :;"'0:r- th :. �ro ss t he c lvmnel s tr i i: i nr.: t� e r i rr:ht s i rl o
B l7ni n n t � 'li J po!"t 1 · � . v1 .-� · "s o r- tl1t• mo da l o � ,i i t s ':1c'."" fo � ·i') nnce e r•-1
26
Model of Design Shown in Exhibit 3 . (Fort Collins - Scale 1 : 60)
27
PLATE 3 .
Discharge 110, 000 sec . -ft. Discharge 110, 000 sec . -ft .
Discharge 160, 000 sec . -ft . Discharge 160, 000 sec . -ft .
Performance of Design Shown in Exhibit 3 . (Fort Collins - Scale 1 : 60) PLATE 4 .
28
Discharge 200, 000 sec . -ft.
Discharge 200, 000 sec . -ft .
Performance of Design Shown in Exhibit 3 . (Fort Collins - Scale 1 : 60)
29
PLATE 5 .
Q = 55, 000 Over Crest Only. Q = 60, 000 Under Gate Only.
Q = 190, 000 Flow Through Gate Only .
Perform9.nce of Design Shown in Exhibit 3 . Abnornal Conditions of Discharge . PLATE 6 .
30
'
•
. shown on Pletes 3 to 6 . Tho effe ct ot the curve below tr.e �ete end
o f the we ter coming over "the open r::rest co:n'Jincd "to !'orn rough flow
i n transi t ion an� sl:-.f ft . At max i�um ce�� c i ty the e hoft appeared
completely chok�1 he low the portal ; although a rer1cvab le se ct ion had
been le ft in the cro�?n o f the trene i tion fo:!9 i)°'J servat ion purposes ,
1 t proved use less 9 S tte splt. sh t'h:-ough 1 t ·,1hen opened ..,,as suffic ient
to drench an obser".."er c.;nd 11 ttle could ba seen . The r..ort ion o f the
sbe ft belol7 the end o : the trans i t ion was romo .. _ .. ed ; 1 t t>m a then epper
ent the t th3 trans it ion �ns really . runnin� ot about its des i�ed
de}lth , and that th'..: 1::'ppc r,ra!'lce o f choking W P. S dU•3 to P heavy spray.
Pl111t.: 7 shows t ho r.pl),, ercnc0 o f the .1 et , an� , for co?!!par ison , the e11-
pe13rence nh�n the entire flov: '.vas forcod thTough the· e.ato nlono . In
th\lse vfo1;1s i t i s not . p0F s ihl11 to d i stfn � i sh st'rey from ·:,atur . Tho
t\3ndency to �rarrl s">irel flow , �hich i s due to tre off,"' ct o f the �1n tor
entering ovor the fixed crost , i s ob sent in the lt ttcr c � s� . It was
impo s s ible to r,1eesv.re '.7Btor surface s bulo'R th - :: p0rtr- l , tut v i su.,l
observet ions f: t - the lov.,er end o f the tr�m s i tiun , At the varti cal bend ,
en� at t�o outlot end of tho tunnel 1nd ic '3 ted th�t �n ever r; �e water
· surface lJ t t·has� po ints 7-Ould r-groo vor:,." clo s r:; ly ,., 1th the t computed .
Thu t osts i nd icate th et thu cornb inat io !l o f e smel l Stoney
gatG �1th ,., · fixed cr·:.et is no t e d,J s irsble t:,pe of spill-::-�e:r o The in
flow over t:10 fixod crest cm1ses lo sses end d i sturbAncc out o f pro ..
port ion to it s �a � itude . !t i s preforablo to roly on tho Stoney
. gate ,:,lone ; in t h·J prose:nt cese , ho·,-,evor , th is ·:,ould _ _ rec,uiro ri gr.te
about 60 by 100 foc� t .
31
' I
Designed Conditions . Discharge through gate
145, 000 sec . -ft . Discharge over crest
55, 000 sec . -ft .
Discharge 200, 000 sec . -ft . Through gate only.
Model of Design Shown on Exhibit 3 . Appearance of Jet at Lower End of Transition .
(Fort Collins - Scale l : 60 )
32
PLATE 7 .
• . .
,
22 . Drui,:i gE.te Et1 i!lwoys. The drum '.';ate cre s-t e-:,r,e �rs to
be best su i ted to t 1 :.e co ndi tions nt Hoover Dar.1 ; bec euse i t c r:n be
pl aced on th ·J s t ea, i:.t de o o f tie canyon ,1,i th the cr..rmnel pnrallel
to the �enera l l i rectlon c f the con tour s an : i the river , t.nii , for the
length chosen , c cn t-e r :ado straigh� w ith t� r.10 � 3rP.t� r�mount of exc ava-
t ion o
The ��� t es '" i ll P- ct as rm unco:nt1·C> l! e -l crest u� to tho dis
charge of 75 , 000 s,:1con r. - fcet in th,J r iver ( C3 , 00Q ov.:,r both spi ll
ways) o Th is d i s ch?or:i,3 -r: ill be re�ched �t e l�V9t ion i�23 f: n·� t:he
head pn the gat � cre st w ill bi ? . 6 fdet o At t his sto;,:�e , th:;; gate s
wo uld he :rin lt) ',7:?ri r.� � i : : d t h a /a1 � char�e woulj incr 1eso to e:.i bout
335 , 000 s0 co "1d -"!'G0 '!; �-!\ :an th-? qste s wi:?ro co�pl,J tcly lowered , w ith
on ly enou.-�h r i s ..... in ·:· :� t er surface to �ro"lia� hea1 for euto�a t i c
op3rat ion ( to �bout ': le vo�ion 122� o 5) or w i � h !10 :r i se in ''7C'1t :·;r sur-
fa ce i f 0'!)9r� t0d menu� :l.1:r o :'he incroa �n t� th.J r�C"U ire<.1 d ischer�c
of 400 , 000 sa co�d-fc�t woul � then be accorn�lish01 by � r i s0 in th0
WF t'3r sur f�c -� to 'c l•:.:vP. "t ion 1 �32 o
23 . The; -.: e s i.r-"?1 p�oposed c�nt8E•·.l:: t 0 s the use of foll!' 16
by 1OO-fo.-; t .-;�� t .., s for N3 ch s":lillway , �i th tl-J.(. u�ual n rrsngt:-.i·1\mts fo r
� i ther �utor.:at i c o::.· :;, '..- :-·mel controlo Th..Jsa �a t 3s �re th ; s -".1tJe s ize
os t hose to b.J u�--Jd fi::>r t�iu 1 �Adden Demo Th,:y GXC.;ed t hd �r-itds used
i n suv,.rP : si)i ll:·: � �TE: 1iuil t by the bureau . r·nd by pri vate companies
by only 18 inch,J s i n hr.:, i .q:ht o The leml';th i s gr 3 �Jkr than h'ls hereto-
foro be,on used , tut � s t h�.: �:::i tas nre h in,1od �' t short int·�rvols this ,
is of no con s::�,.. '. K.n c�: . Tho long gate rcsul t s in cons ic'er!!blt�· economy ,
33
•
( )
due to savin� i:i. steel in t:�e ands e:id the use or fewer piers , es
well as minimizinr:; the de��er of clog�in'J: b!" drift . Closely spaced
piers reduce the di sch_r.r�c for e �iven n�t length and increese the
totel lent;th or channal recuired by oore than the thickness of the
add it ional piers . '!'ho len�th o� c�annel selected is the lon��st
well ade�ted to the topo�ra�hy.
24. :'he cr-�st is desi&.r.1od to hevo � r.:ax imum s!idi� co
officiont o f .65, r>ssur1inll , 1Nith no hac�twr- ter , full uplift ov'3r
two-th ir1s o f tho b�s� et h�el , decreesin� to zero a� e po int 5 feet
from the- toe , �Yl-idrc- d:?"a intig,; v,111 be prov11t,d ; or , ess\.u :in� backwAt\3r ,
full upl ift ')V,'3r t-.-:o -th irds of the base et both lNel encl too . Anel
yses of the s�ct fon eri.: sho -:;n by �hir-1 ts 7 and 8 . !n no cas:i ·rill
tha founJ rl t ion ho h in:hor tMn eluvotion 1175 ; �his 1e thE; minimum
section. On tho Ncvad� s i1 .:' , tho slope of tho u-ps"tr-:em f�co inter
sects th,:, �round surfrico · ,- t �bout clovflt ion 1138 P.t the lor,, 1 st l)Oint ;
the bottom of th0 Ch$nnul i s Pbout orw foot hi�er . �is i e tha max
imum hoi �t of th:. cr.-� st .
25 . �teils of thl) we ir crost , p1'3rs ond control mechanism
ero shown b.r �hibits 9 , 10 en� 11 .
26 . It he s been sug�osted· that tha ncc id_antel dropping of .r
one of t1h:i s .1 g�t\Js vzould r.iateriell:, inQr1.>es:.i th� flo,r, in tho riV•:>r . ·
Tho mP-ximtnn 1ncrc.asc. duo to acc idental dropping of one getii would
be about 30 ; 000 socond-fdot et e timo whon tho totel r 1vor discharge
WPS 75 ,ono socond-feot ; that is , the riv�r �ischarg� would increnso
from 75 , 000 to 105·,ooo seoond-f\lot .
34 '1
•
w (11
r'1 X :c (IJ -..J
..
-==--,,,..,,==..,,,,,,,,,...,,..,....,.,,....,--� · W. S . E L . 1 2 3 2 . 0 r---- --- --- - - -- -- - ·- - - - - --- - 7 L_� � � � � '=: � "!' . -� � C �- ._,
E L 1 2 2 1 .4
. w N O I W I TH
: � � B��K w
7_�_TER i BACK��:r ��--
L_ _!>�
�
u �-� § -� � F: -z9 · �t::'_C_!:i _ _ �
u, Z w . I Z z w J o .-. : ..J o U.1 Q � - I � a N � ' u ;: :J ; � a:o 1 u i= => (!) C[
E L . 1 20 5 . 4 - i - c{ CI) ; - I - 4 (/) � 0 a: a: t- O (/) I C t- � 0 (() 0 r-! o w · C: z L,L _ u cr 2 w _ u
I J: I-ill::) � ' ..J d; lJJ ::) ([ _J ({
' < > o a. ; (l) LJ. > o Cl (/) LL ! � Li.. ' I LL 1--- -- -�- --- ' --- • -- - - -
2 4.7 i 2 7 . 2 .650 ........,_____ _ • - - - ---- - - � -- --- --- -- - - - -- - - - -
I
� 40 . 8 __ � 42 . 9_i:_5 0 2 __ l 3 9.7 _L.48 9 _
0 M I N f M U M S E C T f-0-�--
t\1 AX I M U M S E C: T I O N
UPL I FT : - N O BAC K WATE R ·- E L . 1 1 7 5 - � O F H EAD AT H E E L TO Z E R O AT D AAI N S F E ET I N S I D E O F TO E . EL.- 1 1 3 0 - i O F H E A D AT H EE L TO Z E R O AT TOE .
W I TH B A C K WATE R - � OF H EA D AT_ H EE L AN D AT TO E .
0
E L . 1 1 3 8 . 0
r- - - - - - - - -� I DOWN STR E A M �Las. P E R ·sQ. 1NcH 1 r----- - - -- r - - - --- --;-·-----'
N O f 1 BACK· · W T H
WATER BACKWATE R
:z Li.I J o o: � - ::l u � er. ;:: 0 <.n Ct z w w ::> ;f > o '"'-
2 1 . 6
- , - --- _ .J
� LU J:Z lJ.J
... o: � Ci'. � a: Z W -' u 1- =>
0 � cn - c:r <r, l'J d: (/J I- Q '}) - > UJ 0: z W ct > cr w ::J cr o Cl :..- 0 Cl , :t LL
5 7. 8 13 .9 I 6 0. 6 1
- • - - _ _ _ ___ l • · · - - -- -- -�
O E P A � T M E N T" O F' T H E 1 N T L R I O R B U A EA U O f' � E C L A M A T I O N
B O U LD E R C A N Y O N P R OJ E C T
H O O V E R D A M A NALY S I S OF S P I LLWAY C R E ST
G A T E R A I S E D
O A A W N : cv.- i....R s ..: e M I T TE D : T f.l A C E O : A t. :. R E C O M M E N D E D :
CH E C K E D APPROV E D :
D E NV E R , COLO., O C T. 8 19)1 145· 0· 1 453
w en
f'1 X J:
CD --I
I
CD
� . -=:-====:-===-====- W S. E L . 1 2 J 2. 0 r---:-:·----- - --- -- . - - -· ----- ---, U P S T R EA M FA C E DOW N STR E AM
LBS . PEA SQ. I NCH 1-- P O U N OS P E R S Q . I N C H -- · -"1 W. S . E L . 1 2 23 . 1 =
: · - --� ,---- �--- - -· . - -- 7 I a: N O W I T H I I N O
I BACK- ! W I TH
' .J � BACKWAT ER· BAC�WATER '. WATER 1 BACK WATER
1-
� 00 ----; 1- w I z u; 1 z ' . z a J 0 c: · J o � · I a u c:x: - :J i \D a : j ;: ::J "' a: I r . � t- m i � o , - ex: � � o I a (! ,-- � (/) , o G I >- o Jl • o r r w C! w ' - ' CC z w · _ u I .J I- Z a / J c:{ LU I -J <l, I I � w :J . U) u.. 1 ::i e! 1 m u. I � > o o. 1 > o o. ,
� I +--'=---t----� ! ; i
� "' I J w · 2 ..J O a: i ((
Cl: tt i ..J O �
<( - ::l I- :J ' c( -U � (J) I, :Z U! (I) u != � - - 0 .... - -� o U> I N c:r: C/l ,- o C/l a: z lAl - w a: 2 UJ
I W ::> Ct 1 CI � a: LLJ ::> C: l > o Cl l o Cl 1 > o O. L!. :r . L1.
,_l,4.1 , 2 4.7 1 , 1 � o "' 1 ,
.6 1 6 � 28.� �' -� �---- _ _ _ __ rv�� M � � -- � E �!:EN E l . 1 1 7 5 ! 1 6 . 9 2 � 22� i I � I
I I I
: I : i / 4 0. 8 � 45. 3 .4 6 5 l 5 8 . 4 l .0 7 9 j l�A X�!� lJ l\.1 _ S E C T I O N E L . 1 1 3 8 \ '. 52 . 8 : 3 6. 9 i 58 . 2
U PL I FT :- N O B AC KWATEH - E L . 1 1 75 - � O F H EA D AT H E E L TO Z E R O AT OAA Y N S FE E T I N S I D E O F TO f. E L . 1 1 38 -� O f H EAD AT H EEL TO ZERO AT TOE .
W I T H B A C KWAT E R - g_ O f H EA D AT H E E L ANO AT TO E . . 3
t E PARTM E' t<J T O F TH E I N T E Q T O R t;j U A E � U O f" A E C L A IVI A T I C) N
G O U � O E R C A N Y O N P R O J C CT
H O O V E R D A M ANALY S IS O F S PI LLWAY CR E ST
G A.T E: LO W E:R E O
O�AW N �. i.. R !• U B M I T T't: C- · TR� C E U A f. •• , C "': � M P,!' E N C' f:' t"
C' � E C: K E C' · ,'\ P J.l � O V E t :
O E ,.. V F A, C O L. 0 . • 0CT. t;3 . 1931 145 ·0- )454
� \ .\·
.,- (.'
. ., ) 'I: '
/
.5cC TIO/Y A-A .
\\
�r _ ,. _, : - · !
r'-' I ·1
� 1
------------------�n�;,
_ _ _ _ _ j
' , .· ·· : , ,,,.
-.
.5 �
r
· -
... -·,
' "', I -' I
-· -\•,I!--• : ---
EL�VA TIO/'I.
-.r
-.,:
I ' A
1 0
t' , ., ft
oi �\ Jf
5ECT/OIY B-B.
:5f"_ �;or.
r -r- ),'-' r
- ..J
� 5 � � t _.:.._._- � �---_l_. ---1
:J.:c 'e J/ r,,.ef'.
;;1
- - ---
l)qA,\NH • • •
T»...:SO . ..
0,,t_Ota)_,
I ,._
1 :----
J '¥ i : ' --,t--+�.-=----::-r----+ .. -+----
.. ,,. ,. ' ' : ( '
' ' I : . : :
I : • I I • V .. . , · · H · · · ·'· � � ' t
I ' ',,, ! ..,. ___ _
�� El-�VATION
El•tlJOOO·t r , , ,,, ::::,,,
_:, ... ·· � r - c>
�· l o Q
.,-: -o.--:.r.L : : .;· -·v_. · 1 -. o ,_;i.
"
0
�f'r""'nl
,s-,1· \ 1
: '
IN° \ l i i
I' " .
) ' ; --� - - ,o--��·,_ · ,. c- • (I .
. •.
q
• • . • 6°0· V Et:,
11asoo·, rv· . . 16'�· · . � -··"�---71" ... ,. e n ,... - .. l
'K'· ···-;,- .___}; ____ · .l!:f/84 00 · • 1[
s,ol! l!Ll!VATto,.; r . ···, _.,,:
.-1- . . . • I
·,-<J (J
OJ "
Sl!!CTION D-D
.--.'oj� -s�· - -9�11· � 110·
S l!CTION A-A
0 i r
1
6 i· ! ,,_r,
"' ! -: ' ' :ti. I
'
4'-(,-'
' I l
ll r
. e t a a. !,
l l ... ...
� �i. ... :t'
�
�
· l 7
..... ,.,,iSiiit""' ....,,..4Wl4 SECTION l!-E
0 " ,, ,o
l!!ICAL.� 0" F'r:�T
,r-- n--. ' ' ' : l ' ' ' ' - � -'
- :
--- . -�·� s-e .-c, ,,11,-100 r1 \1'1 .
"' -f"'-- J r I '
) ---, A
B ,-'
cf"-
"'float wt/I
Trash rack
supf)ly /,nf
I
.............. . · -:·-. -� ·--·_r-·�-'-� (� . . ' . 0 ftoot ="-·
• · 4'·6"d·am ,? C' :'l
v
:� . . -Ladd,r
. n :0 , • I:,
[J • tll/}9 : .. ,-�
r
G
r . "() ,
11. Q
'0 "
!r3"
,,.,.
-p : ()
q �--f: 0
c,-.
<i I l"o 1 1!:?
r·· "
.a r I"{
.1,,1 · , ,) t • • - ·
Q .. f ..cl
'•
._j
{' f...
• r
s·6·
- ,
Sl!CTION G-G
••• ,_.->#'··"'
-----:- � Ape a��bo-;···
(· + .-
·, .. , '··
. .. ..;.,. . - �c - . " .. o) J '
lo .•
- :..--- - .1=···:-··-..... ,; ' � ...... __ -�-;-c-.. - .
SECTION C-C
-, s
5'.rfD,a ,v�// for sp,rw/ slr1irway
0
J�'6'
,- --· _, �
G A _ _,
--------
.,)
'r::;:::::::�: ;:;.:-.:
'-·-:l·· '
. .. . ........ } . ········-- ··--·' ,-, . .. .- . 1 >' r
4 � .w -.f. � � ,. i .f. ,1� •An.; ,1V • : � �
.(l· : ,<l I t-·�,._. -� , } f 'J ,! • I • 1 ':.. ...... • ""\. �
-f -- --··i·,
' ,5.J;,p.·y 'o - .y r r:,,-f--ol volVf., .... ._ • • . _
.;· C <'.\
TJ6�ECTION F"-F *""-7 � o•-...,::rrv•..,-- o, -..... ...,,...1:1.-o-t
9UQCAIJ o, RCX:L,t,,,JJAT',ON
90Ul.O�A CANYON IO�T
HOOVER DAM :SPILL WAY Ptl!� Ol!TAILS
�-.. ,, , .. "'•<fO ,._,. """
loi'NVCR.-C:0'-E )( H l B I T 1 0
45--Q-1432
,,
f
(J
I
L
r··Contraction JOint ------ - - - - - --- - . . ·- · - - - . . . . . . . . . . - - · . . . . · r · . · r- . - - -�:�;ain �rom i�s,de t � of drum qate-- - - - - - -------� r· - - - - - - - - -------;;;1rAn�hor-boffi�- - - - - - - - - - - - - - - - - -n, , , . . - · . . . . , . . . . j · . . . . . t . . . . . . . . . . - . . I • I • -· · · · · · · · · · · · · · 37 Spaces � /61 •49'- 4 .
� •630 f' IB"Crs. Outer row,, � - J!·(rcrs. Inner row
-------------!
I I I I I I I I . '
:,� 624 tJIBtrs Ouftrl"Olr • • 3�o· • Inner row'
Center of clrum qate h,nqe
PT £1. 1189.tsZ''t
- - -,1�
;11
-I , - ·, · · · · · · · · · A , BSO IIJ IZ"crs.- · , · ·· t.L • I - :.:J - i
,nnor �'l , n I # • , I
-- · · ··· - · - - - z7!. 9•. · • · - - - --- ·-• · · - · · · · . . - - · . . - . . - - - - - -- - - - - - - -,s! 5 •. - - - - - . . . . - . . - . . . . . . . . - · · - . - . - - - -�- - - - · - - - · - - - - - .z7!.9•. - - - - . - . - . - --..k- · - - · · · · · - · · - - · z1!.. 9• - · - - · · · · · · . ...
PART PLAN SECTIONAL. PLAN B·B
••• • • • --- - · · · · · · - · · ····---······ ······ · · - · ·· - - - - - • • • · · · · · · · ·Piers Ill' o• Crs.
j a•-!!<!S/'i
1\: i r.r��- ����� ---------• •• • · - · · - • ··- •• -- • • • • • - - -- - - • • • • · - - - - • • - • · · - - · · · 100' 0 • · · • ·
Vlrt. bars tl911•1Z-crs. -·-Out,,- row •CA-I· ·· --. t,,,.,. row •CA-Z l
I j_ i _ l _i _ i __ _ _ _ _ _ __ r- l-1".•�·�'�--:· , -, , .., _
Not, : All horizontal reinforcement to be broken at contraction Joints
, • 630 �nner row fl 3'·g9 Crs.\ • 6Zt,., : iOuter row � 18 Crs. : : � . : \ _..t· · · ·f ," Anchor bolts �!f Crs:i...:.'�.
f l / / 7� ( )('
£L£ VA TI ON A -A
)i.: � -•
... ,l' . . ,. u ·- o ._/.: " :�.
.. ::'? '-;---
�
.. '-·For detail for p,er-s
See Dwq. No.
: : ( � : i : ! : 111 " 'i Ill 1111 I I ' ,' \ \ . I I :--. , . i ' ' • �, .. . ' "-'------� :C....C..
C
... $>
15 · ...
. ii. 11 75.0D ··;, � ..,. -
MINIMUM SECTION
REINFORCEMENT FOR MINIMUM SECTION Note ; Reinforttmtnt for s«:hons other than minimum
to be determined after complrt,on of eJtCOvot,on
I � -,
ft§' Ill" 00
l . .
ELEVATION OF CONTRACTION JOINTS
•O I !\
Sea le of fePt 10 re
\o}J
0£PARTMENT' 0,. THE INT'ERIOR 8URCAU OF rf£CLAMAT'ION
BOULDER CA NYON PROJEC T
H O O V E R D A M SPILLWAY CREST O£TA l�S
o•• •flll' ' ' • •v_.,, ,. , , u , ,.,,1 c, • ' .J C V llCCO .. M C "'Cl"D 1,,·w1 < • I L.: ,. ._.�O\ I 1,
C ' l. "- 1.· 1 Q l'OLo ('C- r ,, • • •
E X H 1 8 1T 1 1 •s-o..,.,,
2? . How0": ·�r , w i th gates e s no� cl � s i ';net! , the!"e is no reason
to oxnoc t such ,m occ urr-:=mc,1 . Ace i dent8l 1ropp1n:� has , in the past ,
boen d ue r.: it ':·3r to fr. nu�� o:r seals , t"13 1lur\°J o f d rr in ho e�! , or clo E?
ging ot Br.lRll pi_�·:. s on -�h i ch d..:rpended t ho o,or q t lon � f tho 'balanced
valve which contro ls ?. utonat ic o � retion . �o s0als no w used are made
of met al , an--1 arc ::nt ir,�ly � i fforent from t hoa .1 ;1h i ch fe ilod . There
is no r.1oro r ,..:a son to an t i c ip?. to fa ilUTe of th'"1 -pr.:s1?nt S\.�a!.s �hen o f
tho �At o i t sol f . 'I'r. -� d es ign o f th.:. val vos hns br.::n chang-:d so th at
c loggi ng is impossiblf; . Pr-a st fe i luro o f dra in hos,; wr. s d11� to Abra
s ion o f t �c :10s ."; -;v i th th,; movtJrncnt of th e g13t ::, ; th is i s nov, wntchr�d
for when th .: .q;ot ,: i � -pl�c r :1 . ::7h i le though t unr. ::cessr::ry , e check
V':l lvc could ;'1 as �. ly re pl ".'1� •31 in t he =-'re in hos '1 l i no to Pr��vr,nt wa ter
from ,:nt0 :dnt:; t : , .: 9'f1 t-:· . Yis ib lo outl, ... ts ':'!i ll b :: T)rovirlDd for tho
dra in ho so , so th '!t an:r inc�r n se in d i sc!':e r �e cAn '3G n ily b{! seen .
28 . �vcn s rDuld �cc ide�tal d��r,in� occur , it will r.o no
t iced c l.Mo st in.stantl:;," ':! t t l-:.,) pow.Jr houst, . T'v1 inlu t s to t,h,� gate
chamb ·. rs 5:"J :'.. -=tr - ·J c::10ug� so th r. t t ho gn°t'3s c a:1 be r d ss,d i f the seals
ar\3 orn i ttod �:nt ira1:, ; in ccsc o f· tro1.1bl·� ·,:!.th th:-;; bJ;.llencod valve , it
can bo shut o f f �nd t �o �mar��ncy valvb u� �d ; f n i in th� case of
fa i lure o f the ho so , tc::ipor,:..ry repe irs c en be :::adc in e Vi.. rY sh:>rt
t im1:1 . Th � gat13 coulc: , ther,:!forc , be rFJi sc1 agn in so �ui ckly that
po int
i sch �r�o ?0uld � lmost hava . d i sap?e crod by the t ime s
it co uld c €uso d or.iage had bcr'.n roach3� .
40
•
8·3 . ':'he c'!"est ce - :; c :ty h es h..-Jen co:;iputed fr or· Francis '
forr.:ul:- , usin(.,. G C·'Je f n c ir n t 0 r 3 . f:. 5 :!'or f..'.'e.a;es lo·:•ered "!'ld ;3 . ?b for
ga tes rtd :ied. . T�-� r-e �'J e f i'ic :.ents check th'9 :,o del experiments. I n
order to :-ed: : ce t �o d :-o p in water sur frice Yt €·r t :. :e , .. .-e i 1·, the d:an
·uel h �s bee n ·� f3 .r:>i ''T.e�l so t 1r.:. t D consid e1· �L l ·� -:, �, r t o f tr� e c-:--est is
submerP.:e-i ; th is r! ,Jc ;•ee t e s t:1 e coeff'i c ien t o f r1 :� s ,..! · . r· � - ;e : 1 f the crest
by . 06 r c r:; :::,r·1 in r� t.-; t :�sts r-+-: '?'ort Collin s . '!'he m:13 :·J ls hoth �t Fort
Coll ins �ma ut : 'o !1tr')�C h r:V(! s?10,.tm thr-: s A !r10 s, :t·; 1 1 eff'c et on a i schr.r�e
an 1 in t�is t � :w r. ;-:r ;�0 ·:1 it:1 cxpcr i�c n ts t::r Sox �t t h , · Un i v\�r s ity of
Wiscon � ii (BDl l0tin #� 7 � .
30 , ·Th,"3 f' b·st drur: gr::tu d esir;n ·:rh ich ·:1r. s ;-,ruTH.n·od on thd
br�sis o f r. in i:"'.'.Jm -'.'.!0 ::: t i !: s!lov,n by 3xhibit 1� . In or:-!er to ro :l u c t:
th,:: s iz,:: o f : 1;n"' 1 1 1 · (: :- u i Y-ed, t :1._� t,rnns i t ion cu rve wr.i s h(:J:!'.Un in tho
chnn nGl, r �;H,ill t i n g- in t l-io �: : rkcrl inc:·� P. ::; o in slopr:. .i nst ,:i hovo thn
JX)rtal s'ho�r:n on tho drr: ·0inr!.
31. r o dnl +. ·1 :.-; -t:.u . A conpl···to d o :,cript ion of �il l JTJ0 dl°? l
t:·:st� r , �: 'l . :; ·:rr.:, ul�1 'b .:., _,,, .. ry 1 ; :: "'thy ; as most o f 'the rcsu U; r. •.1 : -ru of
in•Hr· : c t V t1 l u � , s ; 1 •·r i nr· o r: l:1 n s st0ppin'-".- s tr; n ) £ , r,;nl:t the Sll lient
fe r, t ur·:-:s "l' i P. h�: �i.vun in � 1 • 1:,; f'ollo· . ., im-, br :t.· f r� i sc uGsion.
32 . A r.-10 d · � l to , ; s c nle of 1 : 20 '.J f t:10 cksi £7n shO'!:ll by
Exh ibit 12 ··n · s bui lt · t r :c nt::··Js� . The 0:-: coss hra drop from lake to
ch'3n n ..: l ,,,r- t �r a, 1 r r� cc r ,.Js� �lt: ,Jd in � lc1rr-,;0 -mer!zy of cross flo·., ,
which th •= ,,·: �t 0r r.r :: .::;r.1 in th0 chenn0l , . on r. cco:.mt of i ts h i�h veloc
ity and consc0 :1t.Jnt s"': fJ llo':! d e . pth , was too snr.1 11 to d i ssipate sat i s-
41
I 1.
•, I
·"
-•
. r
r • •
r ,
, • . ---:;.
... --J,; . .
. .
., }-" "'J :
_ ., "
..
,-<)
�
. .
)
. �
;.: ... � �
f
t '
....
,. ••
� -.�
, '•:t,-} �' J __,
... "[\
... �,. •
� •
�· <'•: : • ·: \ -l ' • . .
. . -,? : .•
• r,1 . �
. .. --
<!
• •
••
' • -I
'. '. : '. ' ; : ; i> _ _ -_· 1 .
----
. ·,. ,
. .,,
7 11/-�
I .. -:- · '
. .
. .,_,
d
.L
. . I I :
factor i ly . :.'hi r: :rfl sult e� in o h i �h · 'Have on t h e r i (·ht s i ne o f the cli.cn-
n0 l . �"-s.. -� 1..1 c i �- �d S".')ir�1l r .o t ion •:.1 ::: s set up , c � 1 u s i n_Q' co n sild errihl':) commo -
t ion in the tr ::inc i t �on s ,� c t io n bel(1w the c 'r-tt::!lne l :m r.'! r· l so in the vcr-
t i c � l tiena. wl: . .:-"!r � tl-- �\ s �:r: ft jo i ns the t unne l . Sc vo:ro f pl r: �3 h i n� o c
curred· 1J t t�k v .::rt i c c l bun� r• t 120· , QOO so r?ond-fe�t , 1; nd r-.• t 200 , 000
se co nd - foo t t �,.3 flow V!, s i.ro1·y d ist u.,--:- bcd throu�h the who le t unnel ,
rc sul t i n:7. , n:! � 1· t he. ontlo t :-_md , in v ibrn t i'J n ··rh i t"!h to o k the form
0 f b l0\7S , O !' th1.:..·•nn�: , ;• ,: no�t �.�d nt 9 bout 10 -s�-:i co n d i.ntt:'rVf1 l s , f'!nrl \'7h i ch ,
i n thG p�o +.o trh-: , na .;o ubt ·::o u.ld bo very o b 5 o c t ionF.!r.l o . Plrt1.1 8 shows
cond i t ioas in th � chr .. n!"! ·· l .
3�-S . I:i. ·:i :rd c :r t0 i n crc nse tho d ·:: �Jth o r ,_\_r,�: t i··r , so n E h � t t Jr
to d i ss i n 1·i t -� t i: :: ··:rr.e :r r:y o f c:ro s s f l-:>i.'Js , o fr. ls .:: - floor wri s � lncc, d in
t� -. c i1 ,-;n--· "' l --- �· -- - . ; .. .... ,· n t 1• •• r] " .,, · ,... { "-rrl-1 ' -,... · t l ? ) · 1· n ,... t l" ·· floor . t , , , , .• • lv , · . . � .:.� _ . . ) : ,. J t .L !' u ,, l . .,� ...;.i . . . 1 1 , , l ,., , !'f'. 1 S : : •'-'
19 fe0 t �-i t s t ·:: t t ·:m �1+ C�C . Sor.e ir.rprove:.1r: !1t ·:· �i s -::. f:f'e � t f:cl b:,r t:1 i s . A
cu:·vc� -1 b '1 f fL. in t: •..:. f'o '!'!� 1') f n c0 ·J in !! ·�· t:! P ?.1 1 ·=. c- :: a r lo r l! th.-:: !' i Sh t s i �c
o f tli ,:: e 1 : r : n--1 :; l , t:, r•. · ,j 11 c ··· : 1·:c h ..: ir-h t o f t·: . · ·•i ·> �,:::- i : l0 n r-; t 1v.: 1: si o. J .
Th i s ir.-:u·: ·0 11.:::d co n � i t t o n t; con s i ier[1 h ly , tot�� i !'l t : : i:! chi.-nn,)l :�nn in the
sh�ft �ni t unn � l .
:34 . �:;u pcr :•· .· . t , - 1 • r�;1,rl f:! h i .:.-h-�:r· ··.•:r- t -:r s1 1 r f..- Cd in the chEnn.:;l
s:..; - 1r:1.3 1 n -.;c : � s ':ry . T:-.r s 11 co u lrt bn -pro 1.u --:: J1 bv- r •::!o ntr e c t ion t: t the
lo . . �•Jr end o r· t�.•:: c he �r.01 . pr�rtly bc� c ousc t h'3 l "'= r r--� si zc of tr -::i rio!"l ol
rr.nd'3 mov i nn; t�·J p:.rt:::: --1 U ''f i e1; l t , e :-id -port l:T be c r: · �se i t ·t�fr n t ho u�ht
S1JbT:'!-1Tt;""0d flo ·-·, ":''OUlC !" �:. ·/ \; r: r.:ar°l<ed e ffe ct in :J�O o th i n r.i: out S'.JJ' fP. C O
irrcgu l :.�r i t i . .? S , , t:·.� COTi trect i o n ".'85 forr:�ed c:r b lo ck ing o f f O S ,Jg-
mo!' t n l s,.� c t ion ct th\: c:·own o f the arch ; a b ;3 l l -?11o uth cnt:r :mco P�: s
43
+="" +=""
\ r, , . I. ·:._·�
12-AC-l . No discharge . 12-D-l . 50, 000 Sec . -Ft . Di�charge � -
12-A-l . 100, 000 Sec . -Ft. Discharge . 12-C-l . 200, 000 Sec . -Ft . Discharge .
First Drum Gate Model (Exhibit 12) (Montrose - Scale 1 : 20) This design had too great a drop of the water between the reservoir and channel levels. PLATE 8 .
& ll!'7 ,.
/
X-6�. No Discharge . 9-C-l . 100, 000 Sec . -Ft . Discharge .
X-59 , 180,000 Sec . -Ft . Discharge . 9-A-l. 200,000 Sec. -Ft. Discharge .
Model of Design Shown by Exhibit 12 . Modified by Raised Floor, Coping Baffle, Bell Mouth and Orifice .
The best results obtained with this design were with this set-up . PLATE 9 .
.. .
also pro v i r� ·:?d. ( Se,�: ::::.v. l� H- i t 1 2 . ) A sne l le::· con tra c t i on th�n that
sho,m ·.-,�1s t r ied but d id no t g ive 8S EsQo i :result s. At dischr?rgos over
nbout 1 ? 5, 00J so co nd- fc,-:. t t · "i 0 con t:ract io!l acted as e submer�ed orifice ,
produc i ng deer, ".ff. t c:r i n t�c ch anne l and 3 V.':"'t i "'1� the vrnte:- do 7/l1 the
sha ft "'; it ri r: n�t :J py,or surfnco •
35. rh CJ :re sults in the ch annt: l ·:· i th t ho mod i fi c 8t ions de
scrired a bov e , 1 . c . , r aist:d floor, bJJffle !.md segriente l ori fice Yrith
bell-mo uth e-, t rt:\ncc , '3rC sho·:m on Pla te 9. Th is comb inat ion produced ,
on the ,vho lo, t�c �)est r e sults ob t 1-:1 ined . SeverE l oth e r modi fications
in wh ich b P- f fl , �s of -� j ff.:?rcnt forM s we-re subst i t u tcd for the coping
wor0 tr i o� � i th �nrying d0gr�es of success .
36 . ''Ih ilc th0 � rr�ngon: :mt desc:r i b,J 1 r.,ro duc i:·d SP t i sfr.ct0ry
cond i t i ons 3 t lo ·,·i o r.a h i�h st aa;cs, over t}: 3 int ,.;rrcdi E1 to r�ngc tho
flow i n t�t.! ·:! !-.::mn :.:l v:e s v . .- ry rou,;,h ; tmd ·.vh i h� this rouf.!hnc ss sm::?1od
no t to c ff0 c t �ho flo·:1 i � �� rt ft r,1 t un'"!-� l , i t ... �s 1<;. s i�: d �o hPv·· as
smooth flow as oossibln � � al l stn�es. As no further improvement seeme d
poss i ble w i th t h is dcs i "n, the model \rns cr."n �\}d to t he a �sit;n sho�n
b �r Exh i\.its 1 � ,d 2. O n account o f thr: lP. r <:;� size o f t ho moticl , con
sidarob le ti�a i � r� � u i rod �0 rneke th� a l t aret ions , �hi ch roquiro
b�i ld in � a nc'"� trr.nd t ion F.>nd moving t ha sh� ft , as '.9:cll es practi celly
rcbu il 1 in� t h0 sid ,: c ': t,nno l. Henco , altho ugh ' work we s b .1gun about
September 1 , 1931 , no t o sts of tho new d-1 ci� 9:tcept those ot Fort
Colli ns ·.·1 111 bo �-.vt i lll t.le pr ior to thJ board ' s v i s i t to ?,bntro so .
46
•
\
Cres l- Elev.
,,.. 1 , 205 * •
L_ J111 0 · -1
• El. !/61.8
. >/ i t on • 1-; � s - E l..'_ l f6 0 ........ =� ... = �Ot;;;· ��-- -- - -- - - -
.
, _ _ · --·- - , �- =?; j . - --
� . <.: -
I I t I :
. . . . . . ·" . we,r j... . � ·. section
l · � · <
r
/ 109 2
SECTI ON A - A
-· .
--- -�-G- -- � I I
-< - - - - - - - r O O. 0 - - - .,.. -< I I . 0 I
-
L>-S E.CTION ON ¢,
T
J I L _ _ ___ -I
I
I
I '
-<
'1./erfey of Parabola e'� lJ :.0027 -x2
1 7!.;. 6 '
I NC H ES - I . E>O M O D E L 0 5 1 0 1 5 20
I : : ,
,o 0 so 100
-
>-
2i -/ \- - -
T - -- - ---- --- - - . . - - -- - - - - - - - 7 - - -- --- - --- -- -- -- - - -- - - -- - -� - -I �El 1161.B__ I
--- -- - - - � c/; Channel :
-- - - . - -...- - - - -- - - --
P L A N
��-U9�� -� I I
------------------------------------------------ ---------,---- ·- -- ·- - - . ---- . ·- . · -- � - -- - - - - - -- - ------ --- -- --·-
I I - - ----- - ·- t-I
--� -, - -
>
' 14 ? Q
S ECTION B · B
TYPI CA L A TO C
<)
-- - - -- -- - --- - -- -
ct. Tunnel
- --- -- - - ---=---�
,,,--
47
--------- - --- ·-----
..... .
E f 1 0 3 3 6
I 8 6 . 6 >4
- --:-�-----
' Q::, " ·
(,,-; /-, -� i :", .... ... � �
- - 40.o·-S E C T I O N C - C - 69 0
1- - - -
. . I '
I
' - -·, .f ': ...., I • l°'l - � • 0 V) • ' I t..D 7)-, (
I • f")
E ' 9� � � . . _ ":: _ 't: . . t
4 33. 0 ' .. S E C TI O N D · D
><· · 54 5 · . . - >-1 - � . ..
0 . . -i · N
e - � - --� - . P- ??.5- �- -
SECTI ON G -G DEPARTMENT OF THe IWRRIOR
BUREAU 01' RCCL AMATION B O U LI)£� CA NYON PROJECT
H O O VE R DA M . DRUM GATE S PI L L WA Y
FO RT C O L L I N S M O D E L No. I
O � AWH /1. L_. � . SUBMITTED . . . . . T R A CED ll t,I. _ . RECOMtvfl!HDEO . c ,-4 e c 1<Eo <: . ../lL A P PRoveo .
D EI./Vl!I( COLO., 8 · '7· ' ''' 14S - 0 - 1'1�4
E X H I B I T 13
I . . ' ·1
r··
r,
3 7 . A n -··. v: c k [:; i. '.�n ., .. ,-, s pr:m�rGrl -f') J' s t u-i y r:· n(I i_s shr:, ·:rn i�
Exh ibit 12 . For t ,: t t e;r 0h st:;r,, ·:: tion of con i i t ion s in · the ver tical
tr 1ms it ion h :n�. �nd r.!1 : · ft , r:r.1 for '3af'o �-; r ; - ��:in � t 1 -f:t:;r'lt ion s, tho ..
section .. ,r- s mr. jc O ".'•.:n r.roun� the tronei t ::on r. -:i :1r1 •
38. In -:h-:. n �;·,v d ,;:: si ·91 , tt:u t�P.r.r. i t '!. ,rn 01;,rvo •.n. s om itte:.d
from t IW Cf. !Jlln 31 i � rc::lf r;p_,j V.'8 S b0!-;UD 4:) fo,.�t h elov: tht: lo•·rcr end
of th-:: spill•·; r y crc.:-::t ; thr: hc, ttom o f the ch'. rmol ·:ins lo·:1orod e t t ho
upper r:·nd , r --. sul ti �.r-: in � �;�mC"'!he � fli:: t�or grarlc.
3·3. A rnc.. cel (sc�lc 1:60) ·:ms rr. ·: d ·:> �+. For t C:, llins . '!'his
d :: sign sho··· ,Jd :-1·:r�-:c: r.l i?!'.provnr..�nt over the prr;v ious one, bu-t st ill
:·!�: s not t�oro u�hly �r t i s f 1: ct(JI·�r. Vi-:.�ws of this ;.1o dc�l �nrl of i t s :r�r-
fo::rr.:rncc r- r .) sh,)•·.•n t: �.r Plr:t(; F.i . 3r.p0rL�(? n c s ·:· - 1r .': �: :·, rh; on t h :: .jff\: ct
of Ch':nr:, in� tr. '.) ·1: H st�nr.,) b •Jt·:·ri, :n t!°l� en d o f th : spill· .. . r :;r cr ,..: st r.nd
thu b t;gia"'linn: o !"' t:--: r., tr!:r: s i t ion b :;nd ; .,�so �·:i th 1.-.: ,:·-pcr. i nr- tr, :: ,,., ,.· t ::r
in tlrn ch"' nn .:l by r;.c. � m: u f l!C"Jntr"· c t ions ; f0 �:. · �1 t:r r� i f; in :z t� .1 hr.> t tom
1.n ":-1 contr'! C t in � the f.. i � r;s b · · J �..-: th o nnd o f' ":11 ,·. sn ill· · -- �" c!' ! S t in ri i f-
f�r t nt ··:P1ount s.
40 . Cro � s ·:1�� irs, r;i,r;iil·::r �o th --·. t s:·10 · ::i on 3xhi �it s 1 �n 1
2 , in h •;: i;,:h �; s r r· r�:Ti l:.t· fror • . h.i to 40 fcc::t , . . :·.a ·_; f"f::.. -:: t E up to 20 .f :; Ot
\-�· id r. , •.- ·3r-. oxn �1· i.r: ::.- i:�t . . d · ·· i t'"' in d iff ·:r(�".'lt �u:r.b i r. ... t i ons . 'I'he: uff.�ct
of di ff �r-mt h�is:-�� ·.•:c i::-·:.:: f a sho·r:n in Pl � t J II. Whilt:.,; the B r�ic ·.v" ter .
surfr c_o nl.::v'": tior. c r -:1 r t:; -::: l:- t �. i :i-2 d " · t th{i 10·7;_:;r ·:: .... ,r: of t �.(; spillw'"·Y
cr:.:: s t by r contr: .ct ion i"1 S by ;. �eir, . t ho '1 :'1 ir h:-· s mor\: effect in
smo thin R; t h-J flo,,., . A flr: t slopo to th:.:: f�! c\3 o f the ·:· e;.ir i:r.ipr-,irod
48
,,
(
,,
I..
i ts e ffec t . T'h e offs13t , or shoul der , sho 1 ·•n on the drr-iv: i n� a t t he 101.·�er
end o f the s p i l l�ey cre s t i s very desir ab le , hec nu&e : • i thout i t t �ere
ex i s t s e " ho le" ·in the ··: � : er surf�ce at th 1 ·t 1oi:: t , ·::hi ch i s o b l i t er
A t e a by the o t'fse t . By me r.n s o r these stwl i e s , the d e s L-m pre sen ted
in Exh ibit s 1 �na 2 n:. s ar:r· j ved i t . Pln t e s 12 � nd 13 sho·:: n d e si 1t1
wi th lo ·� we i r 8n1 l�r�0 contr Ac tion . I n t h i s c � � c , t h e b� ffl e s ore
much m0re e ff� c t ive th nr. ·•,i th the h i .'sher ·,· , ,s ir . Th i � ,1 e s i .r::n , ·::hile
q u it e � ffoc t 1 ·,c ... · n cl Ror.e ·.vh r: t lo�·,cr in cos t , . . �. s not c o n s i dc�cd ,�u i te
n s �oo d � s t h � t s� 1 0 ·--n i.n ?:x h ib i t s 1 end 2 .
41 . I t i s, �e rh nns, n ft urol to i n� u ire ho � i t i s posLi h !e
to i ntro 11.1cc '": , :: i r ro: · :e �VJ f0e t h ir;h, �n1 r1 co�·1 trr.c t io n in " O d i t iori. ,
:-, cross r: c l-i r-: n-: -.:: 1 ,.� e r. i r.-�e,4 fo� � r: iven flo ·:r , · : j_ t �1o ut r: : 1y nc· c- --� s ;-: i t y o f
enln:rn:i;1� t�: 0 c h' ., nno l . T110r-:..1 ti re t··:o r c; � sons : r'' irst , r cc �� u sc i t i s
prrJct icr,t__. 10. t o subr.:,Jr'"'e t h,:. �1:1 ir t o ri ':'.r< v' t ·n· d 0 p t h t '>1 r · n "f' s t.' s tm"10ri ;
r-i:,d , s :..: ,�oni:l , h ,: � '!'. : c :-: t h :� lo s s in tlio c 1 1 �·:nn ·"' l '1 . ; c r..- · · � � s r ::; t h -:: d :pth
is i n C T' ,J !'.'! S ,: 1 . In ': 1:1 � i. t i rJ :-1 , i� npn1Jt1rs th • · t t�·1 · 1.• :::n··• '.)i.l t'.� d lO S f.'.CS r r,_.
SOF.ie'"r, r , t too �I' J 1'J t . Ex h i bit 14 tJ!10 '.'1 S ') L S ·)J"V : rl ·� nd conput ud \ !f'l t ·Jr
s1Jrf··. c0 s r,) !' t ', -�: r-Jc sir,;1 , .s'xJ · ·n hy �xh i t .i t s l .. _ ,.., ,1 2 .
42 . j, '.') � -�l t ,..: s t .s . I t i. s thou ��. t i n:: ·1 v i �� · - � · 1 r� to burden thi s
r:1.1m-:>r �nd'Jm .. . 1 th f;! cor -:-iL. t€. d e scri"11t ion o f ::i ll ,�x �°Jer ir' <"' "1tS m .·.�d 1·. . Tho
pho to ·�:r·) ph s sho '.'-' r; t'u·:1 ,J f t h0 rooro notl;·;•0r thy fu ,:· turr: s . I t is ur. for
tunP: t0 tli r. t c :-Jrr0c t ir.pr ·:: s z ions c o n no t bo '1 b � J"i ine'1 f rc,m t h 0sc photo
t;rt=: ph n . The n.c t b n ··. f t ?, , ; •:! ,., tor in th , � sh �ft , r ":t � or tl"i rin in t llo
c h ·in:1 ,-, l i t s._; l f, i s tl' •') c h h: f mnon s by -rrh i ch t h .;:; r,·: l '"! t i vc !"11 �r t t o f
d i ffar ,.;nt :1 , s i � s ·. �: s j url �e1 ; rmd it h 11s no t h oc.n f'0un11 po s s i b k to
49
U .. L1
,� :1 - I I ;: . !
f ._. _ ----+-------- -
_.
. i
--DI.StMlClt ALOltCiCEtfTER .UN£ or_ CHAilNEL uan ?ftO �en "*' ·
�_ .:...�- -��-:q�;: --------1�-- . �: :�ff · f IMA ------•-·- - · •----- · •
-- - · -- -· .. .. -- . -
·i:: . ·
t-...., . . ... _ _,_§E_t··�· � :: ;:: · .. . ·- --· • ·
- f .. __.., __ _
l : ·
... -- · -�· - --� . ._ _ . .
--- ----�� -��1-!��e: . . I . I
-+-- ·
!
�
1.,u:11
! . - �'* 1 -·-· .. .... . - ...... . -r · ------- .. ... . . . ..... ,._,._ -�--�-�:: _ _ � I -i i L : _J . i ; �farf d
--�.si-in--tt.
---dwrioti ""exhl ti,is� , -aid . rz · ;_ --l---�-- - -- � -- ·· ·l·-+-- -·- ---!-
_ .. _ - ..-- • • ---+-• • . • • ... ... ... --- .. • • .. +---
t . 4--�f·· - · · l : . , ; :_ : t:: .-::J::: . . t . I I . -� · -i.!-� : - • . - ·· - �- - · _t_ -· --
:.:: -E.,:::t:- : : �l::.� J:_ :�_- · �t::·:u! . -L ·
! i ) __ _ · _ ,_. - -+ -- · -
. . . I ..: . . . t : .. .,, .. ,: . -· :J!:. :t. -.. . . .
- - - - - - - - - -
j
.•. , . . . , -,.. . . - �: : � � -�· ; :.. : . - . · . . . - --- · - -- -- · . .. . .......... - - · - · + · . ' -�- · ----- -. - .. - . - l
-- · - �- - · -+ • -,.... .. :· :· :·: - .,_ :. ; : ; . - : I I. i .
�- · -:Et� ffi· · --- ..... -- - . . .. : . .. : :�:� 0 lllftn.
t--- - •
- - I ; . - - . · - . . • · I
4�ir,;-� 1-:--- - -0---1 ---· : ... .
-, � r:it : l 1 :: : :r: r · I : . -f�-:::::y4 =-=--( : L L 1 --: -�--i--+--�--- : _ _ _ :�>J : :z :11�:� _ t.���1 : � - I - I L • , -�-�
:Itl r
L . ! :--:
. I � , f. . I · . t:. -� l . : . -= ; . . . : - : __ t:.:;-.
• _t::.:..... . t: - --t . - · .• -. · 1�1 ::: _.::: �
:P. , . .
1 -f
' j t-+ . . t •
r J r - r::r ·1 -+J:::�:m-:ti'ZJh�.�--I , _ + l- I i l - 1'1ex�yr�. I J l-! 1-t--t-=----- - - -- - ·
. . I • . . • • 1 · . t • . . , • 1 . (
I · . · 1 · - · • · I · -- , . . . . r · ' . • · . : : ... t . l : � . . . -. . . . . . . . ___ ... .. I : : :: � : · : . �: . • · . . . • · . . , . � • . • I
: f : : . : : : : . : . . . . . . . . t : : : ;;: ,�: i . -.�: :
·--- •--·--· t-- . • -•-· · · ·
,�z,.-
1 ·
. . .. . ; _J _ _ ; _ _
- -· - r- ·--
l
r : - --� - - � . • !
-4-- .
I _ __ .,._ _
I I • t
' : ; : · ----- l . f ·_ .!- -- - - -- �-- . . . : . : ; -- --HOOVflR :o.t.M � . I . . . . • • • •
f
I I . I ! : , ; : · t . . .,_... --- -- - - - · . .. .. .. .
J : ' I :
. . . CD
(,,dll;· . . . . . . I /0-15� l '
E X H I B IT 14-
12-A-0 . Set-up . 12-A-l . Flow 40, 000 c . f . s .
12-A-3 . Flow 120, 000 c . f . s . 12-A-5 . Flow 200, 000 c . f . s .
Model of Design Shown by Exhibit 13 . (Fort Collins - Scale 1 : 60) PLATE
51
24-A -l . Flow 200, 000 c . f . s . Weir 30 ' High. Crest at El . 1143 . 8 .
24-A-2 . Flow 200, 000 c . f . s . Weir 20 ' High . Crest at El . 1133 . 8 .
24-A-3 . Flow 2001 000 c . f. s . Weir 15 ' High. Crest at El . 1128.8.
Effect of Different Heights of Cross Weir in Channel of Exhibit 13. Weir 60 Ft . Below End of Spillway Crest .
(Baffle Shown on Exhibit 4 in Channel) (Fort Collins - Scale 1 : 60 ) PIATE 11 .
52
52-A-O . Set-up . 52-A -3 , Flow 100, 000 c . f . s .
52-A-2 . Flow 150, 000 c . f . s . 52-A-l . Flow 200, 000 c . f . s .
Low Crose Weir with large Lateral Contraction . (Weir Crest at El . 1125 - 25-ft . shoulder )
(Fort Collins - Scale 1 : 60) PLATE 12 .
53
53-A-0 . Set-up. 53-A-3 . Flow 100,000 c . f . s .
53-A-2 . Flow 150, 000 c . f . s . 53-A-l . Flow 200, 000 c . f . s .
Same as Plate 12 except for Addition of Battles .
PLATE 13 .
54
�,
I
reproduc3 this �d!3rn: �tc ly , by c i thor st i ll or. movin�-pi cturo s . Study
of tho pho to ·;r�,hs r. 1 11 sho·., d iffarencos in tho ch:- nnol wt1 ter surfacua ,
but the inor .::B s ion thu[-' a� ined is not in ri ll c"lses c: rel i ab le noons . ... ......
of forrnin� � j 'Jrir:'.P.!er:t . Tr.c only n ccur�to mufln s by -:1h i ch t�10 porform-
«'lncc of n mo ; ,3 1 crn be j 1.1dr--od is by ri ctnr l ol sorvr-- t.ion .
43 . Tr: n s it ion� . Four d ifferent trr,nn 't ti0 r.s •. :ere 1osignod ,
and mod t:ls m� • -b . The curve used in t he rlesi c:m for bot� th� Fort Col
lins � nd Jl�on tro s0 f'i r. · · l rod·.11s ( Exhib its 1 �n1 �) rnve be t ter rosults
th,m r stecp(� r cur-:rn ; on.; considornbly flri t tcr ·.:i �s tr ied rt Tort r.i0l
l i ns, ,·;i th no vis i hlo improvor.1en t o In all d os i�-� ::: , r.n �XCllSS rref'
e aur. l to r;t l rns t 3 �:;-i o f the computed wett!3d l)r�r.i --,� s providod . In
t he desi� no·,� propo si.,d· (Exhibit s. l r nd 2) thur� i s considor,:.-bly 1:1orc
thon th is r t th J 1.1pp .: r '3nd of U·�o t r �nsi t ion , on "'Ccount of n dos ire
to k00p th0 ... r. tcr st :rfr-: c0 b� lO'°! tho anri n�i ng, li n0 o f thc,. cro�·n nrch
un t i l tha V·Jrt i c� l h�::. d ·. · , ·s 11r: ssc i . This rc- s·_1lt � in r n incr•Jrso in
cost �h ich m�y be unno ce ss�ry.
44 . Rond loss:� s . }.10 snt i sff, ctory theory of flo·:1 in b,�nds
i s kno"�n ; ast irrr:. t ion of lo s�os mus t b'3 b <'! � .d .:>n ohscrv r t b�s �nd c x
par im:.mts on SMt-: 1 1 pipe , r.,:) �· ly on 9U-d0cr00 h r:m ds of snsl l r".'dius
runn in .'1. full ; .-:md on ,ms�t 1s1'actory ernpiri c · : l .;,'orr.rn l�£l o I t r:1ppo ars
prob� blc, ho·�cvor , th ' t b�ncl la ssos decre �se ·.1 l th �n incr"H?Se in s ize .,.
of pi po ; nnd th � t � ss�pt ions b oaod on los so s in small pi po · ore there
for� consorv� t ive . EY.h i h it 15 sho�s co�puted depths �nd volocit i es . 1}1
shnft r- nd t unnol . Computnt ions nore beand on � vr lue of "n" o� .013 , ,
( 55
\
in Kutt cr ' s :on:�nlr� e -:or fri t'? t ion lo sses a:i.d on ber: :3 losse s of 0 . 18
end 0 . 1 5 of tr . ., v·.:!locity h·:, ad for the vort i cal be,:d s e nd for the
hor izo!1t sl b -:i�d 1:i tl:c:1 m�vack tun �ul rc sff:- � "'; iv3ly. :'or th ::: b"r.d rnd
tran s it ion at t '. :o top of th •-1 shaft, o los& of 0 . 10 tht.; d i ffcr•mco in
volo c i ty h-3flds ·-1:r:-s r- �: ;.3U.rnod ; thh m�y seor.i srm ll C()mp r:rurl t0 t:1u othor •.
essUJr.pt ion s , b·.1t co!�r. i t ions hero should be fn"ror.J:J:� le 'bo lo�:, b•.:md
lo sse s . Th·rn"." f i �rc s h .... v� lHk:n used by t�rn hur�Jf'U for C'! !1tl!!'1bcr of
ye ar s , and no ln ck of e�prc i t y has over r co:i r : po'!'"te� .
45. V, ·:rticr: 1 h·..:�ds in Models . O r.ly rough �hc.: c1<s !!re; pos
s it lv from t h3 7.,0d!. ls ; r , sult s cigroc V-!J'!"Y .. .,€11 V! ith tl:� computntion s .
}.t Fo rt Coll i n s , t :-1 .:, v c.·r t i c , jl bond end tun nel bc dr)VI r rt-i rrt61 � of tran s-
porer. t r:. �:t -: r t � . 1 , so tLr t t h ·J flow c ,-:n bt-1 ol-. [l'."':!""/,:\1 ; t�, : ·_ , ,., t _ r .3lidos
E1J1oothly nround t h �: t ,� �d :m� no a i st urr. �nc , i s c· vi ,f or.t ; 1'ut rncr:: suro-
m·:·�t s ar, ?- d i ff' i cu li: if no t inposs ih.10 . At ? �on-t;rosiJ , ror.1ov�blc pan e ls
or ''w i ndo .. 's" ·.·1 :�r c S(..t in th·.� 30- i nch v·oorl -s°tAV\..: pip•-! r-h i ch so.rvo s e s
r-. mo del, but o bs�r,.'T t io r n:: tl:·ro , 1fdl th·�se r· indow s �;re; ur. s 1� t isfoctory.
45 . Ho�· i zont::: l b l' : 1 s . !n or1 ; Jr to 01:, s :�rv.-. th(: flo1'! in tho
hor izont '1 1 b :�1 of th1-; �Tp,n•d r . tun� v l '-· r-.::d -..: l ( :., c �- :,:: l : fiO ) · ;r-i s rnr� je �t
Fort Collin s of 10-i nch ···rou:9ht s 'tet1l pin·� , ·0.• !. th tt-1 \':t;ll cut eway as
much as po s s ible. .. 1 .:. ttout p,;rmitt i:1?! th.:; ··.• r: tor to % c�pi;) . vn-u:1n .the wa
ter str i kes th.1 c�r't: ..,; , th :: s '.1r fc co i s fo ld 3 rl 8"1d r; purt of th·.; water
follo,vs th !! top o f t!-.·J pip.J for e short_ d ist n�ce rmd t hun fells into
thc'3 strcnm. Th is net !.on rcna ins pract i co lly th-� sa.�e: for nll flor.·s .
Th-:· radius o f the h(,nd �·mo tha t sho"i7n in th,J spo c ificot ion s, 819 fcot .
56
l[)
t(0
-I >(
t----F�--+---+-�--1�+-+--+-+---l�-f"IIIC...,-�-+-+--f-+---,�-+-1--1�-r-t---t--r-,r--fl"",;;:�',ti�+--1-4--hm .... -.C. ...... --t w
I •
• I
-·1 • I
lfjl , 'I, .1:: H
• t
neu1 .. mu• OO� OIIIOMO-llta t""' ao ... ax
A !'lodel berrl ···Hr 1r oo-foc·t �!!dius was hnilt t \) the ser.; '? s ,�c, v� , !"mt
no irr.r.,:r-over.e�t coulC: 'h. · i nt P.ct ed . Anothor t:10 '1 el · 'f:S rul} t '. ·i th n cor.-
pou�d cur7e · :it'"·. !".o i� �'!"'·r .>'Tf:.t ient . · Flo� in ti � c �e · . . -. .. : d P. i s sr.or:n by
PlPte 14.
4?. A£ ti . f: e :,c, ·;e-de scri. i.- t7'd. e x ·)e1· ir.- :�: � t s rt Fo �· t. Co llins
sho'f:ed no ad7' : n '" t� -... r:- ·1i��d fro:_j a lte:-ir. ·; t '-! ·� r�,:: : u r. o f tl:e hor izo;.tal
b"nd , the '"'l i ---� � ·-· !1+:, si:o·:·n in the S"'ec 1 fic- r1 t io !'! ;, h � s beo:i r·:--t e inad .
48 .
rad ius . 3nn � l
o f ob s(..rvnti0 n .
·rr . .! ? ":) ntrose r.-.o dc l , scc l ".3 .'1 : �O , ·::r. c bu i 1 t to this
� ·:i nris o f' ... loss ·-:er •J plo cor in th : fJip::-; for nu:rpo s :.'.,S
s·· rr.-t Mt: 1: .-� s 01)serve tiod difficult , t- u t t 1p�nr·"n tly
th'.) con 1 i t 1-:fa i B + 'I-, u.1 • •. s : : '. ; · , ·, s t hut in th�? sr:l '. : 11 �r :::od ... J.s r · t F0 �·t Col-
lins . At t :1 · . . t ·m:.._,- .1 ou t l·. t , tl-i._ :n :t ,1r sur f't :c :: i s l. .•v . l e�d th : mo
t ion o f tl: � -.- · � t .: .r si.::r fr· c-.:: s.�t up �:!t th J hori z:>11t nl '(. , · r.d s,: . , _.r .s to hov,,.:i
disr.p?·;r:r . . d .,n � ir .. l�· . Th,·. 1 , : ptl: 1:t tt .� o u tl ·· t n �·,::c s ·.·• 11 1 · · ith t ht"".:
c�rnput�t ion s .
49 . It is 1 ·. l i , , .. . . :=i , in vi:·r o f t:-, - : i· r . . >7,:. , t !":·t no un-. � n vi-
w�cs n :,;.:-. 1 b :-: r .• l t co �--.c1::r:1 h·,. t h is b ,')nd. : t · ·0 1.�ld !"10 "OO ssU · l, : to 81-
10•.·1 tho AriZ'J :1· · s :.: 1 11 · . . i :r ?:r; t ,··s to t::: lo . . ·r '. . , �rJ:- '?l·. t(. 1 :r t � ro:r,.� tha
- tcvr: dF ��t .. 1s �--"' ::�p � -to rr:,·y_r.:: , thus : : :,0:11 :; ; t · 1 ., � ; s(!1 ' : . :·P-c . ir. t t.e NJvoda
tu,,..n � i ,:: � ,. 1,.... ... "' i -- '. "��. ( • h"l lt ,,_.. .. ,_.. J c:- ·-:,, cr •nd f • ·t } fo ...... ,-. , 1 'XC 'nt . , : .: .., - � ,J 'J . • .• • • . . · · 1.. · · J • '-""G t \.. � .._. ..., .,, , ' - ..., ·. . - ·" - .. 1 "'" i-'
mo s t sxtr�or:li:i:.i!? f.�00,1 � . Th "!. s ···o u'!.d "! : tn�· .... Ti unt q l � -:1cea c-ond i t ion
ot the tunn:11 ou t i,.,t r, ···� ich m i;�ht be or. J .:: c t io: 1�' l- 1 �, , r;1Tjd i s cali�vod
un-:1cc ·, ss"!ry .
58
Discharge 60, 000 sec . -ft . Discharge 200,000 sec . -ft .
1600-ft . Radius Bend . Compound Bend .
Flow in Horizontal Bends (Fort Collins - Scale 1 : 60)
59
PLATE 14 .
50. Entrained e ir. Test on side ch�nnel models in 1923
showed e swell of from -3 to +20 per cent with nn evera�e of �hout 5
or 6 per cent ; tests on the Arrowrock spillwey w ith e discharge o f
10 , 000 second-fee t showed n swell o f About 45 per cent . (Julian
Hinds , Side Channel Spi111;7;'ays , Trans. A . s. c. � . , Vol. 89 . ) These
percenta�es �ere derived from observat ions of water surfeces end
velocities in the channel. Even in the medals , such r.ensurements
can not be o f e hi�h order of 8ccurccy ; the measurements �t Arrow
rock were · ma1e under such adverse condi tions that they are believed
of no value . Even if correct , they �ould be too h igh for Maximum
disch�rgas , sinc0 the spill-nny gates ,�ero lo·:•ered only slightly nnd
the �vter fell nbout 40 feet through tho air . This is Plso the con
clusion ro ached by t�. Hinda .
51. Experiments on n model nt Fort Co llins in 1930 indi
cated only about 2 per cont of air ; th�sc me esurcmcmts were vol\Jl'letric
end �re baliovad accurE to. In v1�ry of t�e condit ions et rn6ximum d is-
charge , 1 t is boli•Jvcd th�t P�plo provision for r=iny possible ntnount
of air has boiln rmdo by tho excess ereas pres �)nt 'in th\:.! transition ,
shaft find t unn0l .
52. Frc�ucncy 0f uao of ·spill�ays . Graphs of the rosorvoir
oporet ion undor conditions 5 S of 1938 for t h� y�ers 189? to 1929 in
clusi v0 , P!operod undc�r thu a ire ct ion or ?�. :!!! • B. Det: ler , shor. that
in only nin.J o.f those 33 years would tho wetor hevo reached the fixod
crost o f the drum gbto s�ill�eys. Th� maximum elovetion rcechod
50
(
,.
dul'i n� ,Je ch T-' PJ" (by months ) , with tho d i stnnc 3 atovo o r bulo·:: tho �
fixod cr,"}st ( ol�ve tion l?.05 . 4)_ , 1 s soo�m b�t tho fo llov·ing t r1ble . Tlh-
h 1$ust 1'.!l-�v: : tion r u !:,chc :1 f o · s t ill 10 f-.-: �t b..::low th-J cr,:i st o f the drum
gat�s .
Year
189? 98 99
1900 01 02 03 04
1905 06 07
08 09
1910 11 12 13 14
T.AJ�LE IV
Maximum P.-.1 s'"rvoir ":'/�tor Su:rfaco Eh,vEtions .
Mnx . : Diet. Eibovo : : Mex. : Di stan ce abovo FiXi.ld Elov . : Fix�d Cr�st : Yeer : 3lov. : Cro st
1210 11?2 1185 11?1 11?4 1154 1131 1098 1135 1169 1211 1183 1211 1196 1184 120a 1181 1211
5 -�3 -20 -34 -31 -51 -?4
-109. -70 -36
6 -22
f., -9
-21 -5
-24 6
1915 16 l? 18 19
1920 �1 22 2 3 24
1925 26 27 28 29
1930 31
119? 1192 1211 119? 11?0 -: 1211 1211 120fl 1211 1195 1160 1180 1188 1201 1201
-8 -13
6 -8
-35
0 6 0 6
-10 -45 -25 -17
-4
-·1 - ? ( No t included) · -? ( in comru t � t ions
33. Flood cr.pec i ty . It is of i n tere: st to : , s t ir.ir-:t,� th,� r:iax
imum flood ·.·rh i ch cen b� ht\ndl-:;d ot Hoovt �r Dem. Tor th i s purpose 1 t
is necessary to a ssume � floo d . Data for th� assumptions medc aro
token from th3 repor t , "Hydrolo�y o f thu Bould3r Cnnyon Reservoir , "
(J�nuary 31 , 1930 Y by s . B . Dublor, (Ex . 3, p. 6 , �nd Ex . A , p . 8) .
Tho �stimat�d flood vo lm:10s di schergod by the river dur ing the timo
when th€ rot � o f � ischergc �xcoodcd o c ert ain spocifiod figure ere
68 follOTTS :
61
TAB� V
Colorado River at Black canyon
Run� ff Volumes - Ten-Thousand-Year Flood
Runoff r :1111on Acre-Feet
22 l? 12 10
•2 . e * . 8
!)is r.!har��ed Wh i le Ra te Exceeded
40,000 Sec. -Ft . 50,000 60 , 000 ?5,000
100 , 000 200 , 000 400
!000
* �xtrAEolated values
The above f i�ure s are for undepleted flow ; that i s , 8ctual figures
o f record are corrected for depletion to �ive wha t the vo lu�e of
d i scharge woul-:i h '3ve been if no deve lopment he11 te l-:en place . They
are , there fore , larger than �ould a ctual ly occur, even with the
pre sent upstream deve lopment s.
54. From the above fi�res, the volm:-ie dischnrged dur
ing the t ima the rate of flow ex ceeded nny � iven :-:mount is known .
55. The pe� k 1 ischarP-e of the flood �� ich pro�nh ly
would be e ,:,unl'3d or exceeded once in ten tho us�nd ye ars is e sti
mated a t 450 , 000 se cond-feet . For t he purpo se of constructing a
hydrograph, this ,e�k flow is not entirely consistent with the es
t imates of volllr.le . A characterist ic of hi�h Colorado River floods
is t he short 1ura t ion of th o peak discharge , and since assumption
of a sharp peek is unfavorable, it has been made . This a ssumption
82
(
- - .(
(
results in e peak of 800 , 000 second-feet , or about 1 . 8 t imes the es
timated probable peek flow ; the flow in the river would then exceed
100 , 000 second-feet for only 30 dnys.. 1'his is ebout the ser.e t ime as
for floods Of record , ,.,hich ere , 0 f course , r.1uch smeller thon that as
sumed 1 · during the 18E4 flood , the rate of discharge probably exceed3d
_ 100 , 000 socond-feet for �O days . Tho ssaur.ipt ions , therefore , seem
very consorvot ive .
56 . It has been assumed that no flood storege was . ava ilable
et the bo�innin� o f tho flood i that the drwn �ates oporatod eutomet
tcally; that outlot velv�s were opened whon the wcter surfnce reached
elevation 1232 , and thet the po,,er house discherge wns 12 , 000 second
teet. As shown grephicelly on Exhibit 16 , the weter surface would
have risen to elovation 1233 . 6 . If tho outlots had rc�ained closed ,
tho water surfaco would hove r isen to elovetion 1235 , st ill 27 inches
below the top of tho parapet well.
5'1 . On the ssr.ia assumptions , (outlet valves rcrnr.ini�g
oloaed ) · 'for tho dtl&ign shown in tho spe_c ificetions , the weter ·.-,puld . .
h8V\ flowed e'bc)ut rn inch da�p over tho perop1t .
58. Amplo wsrnin� o f e flood o f suoh :.1e�itudo would be
gi9<J1l by tb.3 r-.mount of snow in the mount a ins ; the r i vcr st ago et
Hoov3r Dam o�n b� prodicted eccurstc � 3 to 5 days in edvanco from
41echergos o f tha tributorit.1s . Tho assumptions medo f1ra , therefor� .
au oonsorvat iva . It would seom probable thet if adventeg� of ell
evaileblo int'ormotion r.cr-J t!,kcn by thos� vi telly intercst�d , e flood
wt.th e p�ok flow in tho neighborhood of one till ion socond-feet could
set�ly be pasP.Jd throu� tho reservo ir.
63
--�- _ _ _ _lwl ____ __ _
I I I I I --
! I
- ----- . . - - --
I • -::-: --+--------- • ----- - ---· • .
"d C: d ClQ
0 . . -i � ....
· - -· -t;:·----- · •-- -- --� I
i
r · ---,
:; � --__ .,__ _ ___. ___ �_ .. -- _ ___ J ___ . -- t ID .. • "' 0
i I PD-�ous
-, i *-+-.,. i ,s
-: 0, � + O
tt 0
i :- 1· ·-6 :: �-
.._ O i
. A�umtci DQ.t� -Flooct PeakL 800� s.f. equcal +o 1 .11 +in1e1
. proboala ""'" +h•IGfld yBAr ,� . _Vo\��-..���-ro���I• +en tho!"s__ca�d
Abo.,. '200. 000 s.f 1 2.E.32 .000 ,-..F. ! Abo-,� 400.000 sf. . 71&.ooo A.F. ; TatDl �th both Craa b 800 Fi-. eLa�r crest Elev 1'107 w�+� qaies lowered . o,·a chor,e � • CC.!H �
' C vorioltlc. ( Cut1fe No.• • Owct. " - e>- set) Dr"'t Gcite,; cisi"'rrici,i � hold �h ;. suriac.c at !t. tn, u.,..., co,nplately 1ow-ered .
: l
I
.
- � I ' i
I
i '
_ __ ___ L __ _
----- -• ----··--· -- - +-·----
j
I -- - l
� i t---�---tr---��----,�------+----,.-----+-------+------4------4---"' • � � I I p +we 1---------- -
• M I I . ---.---..---.--� j . _ _ . __ _ _ • TSN T AND -<EAR FLOOD
;1-----1------11,.UL .... ---l�--, --+-�-__. ____ -t- · · - - · -- j - -·· - ?�=�t�r:�� ! .� ,� '" . t... � : .. ma. a ·• d. reJc.,e.e . . ltS·J- ,�4
E>CH l 8 1T 1 6 . "' • .i.
'' .. J;:Jf �t:f t .· · . ' ,,. . :r:;::t;;;;��!;:l�i;{f' ; _ : :!_\ _:,:�{ · ·' 1 ':,_{�
· ··-/.;;.:, .:\?. ·
:ii,�
'.�it ,; : �
; .. _.
\£\: • .:'- · ,
3t 1;f!0 , '
three
\f'..Y�f\ : : .---�\\ -.· · q�H/ jin,i�q'.qft ion to the spillway types already dis cussed, " ._{',: '�i; . �.:� � · .. _ · . . �: ·. >: . � :
othor,1:�.f:/2.��\p��Y�itf�c.n sug_�asted:; ; • e . ,
::'{\)T}l{:"/�Jbi?it�lied cr.�.st, ;
. ·; ; _:(·.p _).f'.sJ{ilon �11·n1wa:,rs·;
{ c ) glor-y holt: .
GO. Uncontrollod crest . A.� uncontrolled cr�st is irnpr� c
ticablc �i th�ut al lo·T-?in(! e r:mch greater r :.s(� than 3 ft.:.ct for the
great incr, :, asc in d iscr r;�g-� :roo uired ( 168, 500 sc conf! -fcnt ) bot,·,���
elevation 1 �B9 end 0l�vation 1232 . This woul1 r e r- uire 0i t!rnr tha t
the dam b e rr� i sad 0 r thnt t�v1 flood control storn�:::, o:r the por.rer
head and po�:or 3nd irr i r-;o tion storng'-3, be d n cr·:: ascd . Exhihit 17
shows the l :rnl;th o f crest n0c·.r ns ar:r fo:r .... � c�� s ;;illwf.: J for 0 to tal
, d ischarg� of 63 , OJ ) s,·· cond-foet n"'; c lt3V�t ion 1229 rnd 400, JOO second
feet at d i ffar m t 0lovr t ions. For 400 , ·)00 secr:mri- f �r:t r1t e l0Yr; tion
1�32 . 5 o·�ch cr J st •:mule n�2d to b,:.: 3 , 00J fo: t lo n � ; or for t\·10 400 -
foot cr :.:i st s , o max imu� ·.·.-11 t ,"'r sur f---1 ce of 1;;b0ut 124-� . 5 ,:·ouln h,:, reo uir'7!d.
The c o nt o f a1.1c!1 spill ·. , ... :tf: 7robobly ··muln ·c1 c:, son.:, ,·:hut 1, , ss th rm thr,t
of the 1rU;. ;-; ·:rt e E �·i ll�-- ! ys nropo sed .
61 . Sin110n r,pill·:1: · :,rs. !:Ont :;ct 1rnl s-piil·.n. �:s e ho·:: " e ffi-
c bnci : s" or 70 p(':r c ,.;nt or l0 ss a lthough much h i:--h,.;r �, ff'ic ionci0s
h�·vc b m!n obt�1�ed i"'itr. modols . rr an 1:r!'fic foncy of 60 -p-�r c �nt be
e ssumoa ol'i a cco unt of thr: lt1r�o throat, enrl t�D rlrop in he[jd be te kon
o e9uel to tho h �; i1r.:"t of t1rn · ··:,/tor b �rom3tor , 24 s iphonE ·.·: i th throats
15 fe·1 t !li�h. by 20 f-:;c:t ·�-.:.id� , or the cqui vabnt, ·,-rould be nueded for
each spi llv1aJr. It i ii felt that· tho· p110sont kno'.7L.,dgc of s iphon sri}..1-
. �_._; :, 1
. - ' �·-·- . !
. 65
• • I ... ' " . . :�·�.! J
.. : . '
·3 . J
! -- ; --
·-- y -- -----r--- ___ .___ . . .
·-•- . . . .iii= l""IA
· - •- -- I
I I I I
-+-- - I ll •--- -1 -- ___ 1 . l
\ I i .
..
! +- - -- --!
-
\
i I
------· i --1 l
;
I I
- --- - - - -t ---- . i
: I ; • - - - - - · --+-- • _ _ .., ____ ·- '
� - - - · ---· · ·
�, ¼ · ' t 2. 4 G l 'o \� 1if. 1k; l'e. � '2'2 : � d Req wed leoqtl1 each Spillwny- Huodteds of EN
' . I I . I I I
_ . . _H.OOVE R. DAM L- ___ .
i · - - - -- ·--t-
- -�. J. tt. , .-,o.J
- - . j :
;. - o·· ·· V
SID£ CHANNEL $P1llWAY• FREE CREST MQUIREO LEN&,,.- EACH SP,ILLWAV
Oiact.erqe 69,000 Sec. t:t. cit EltY: 1'29
�00.000 $ec.n. at Givan ile\'.
- l . 45. 1��! EX H I B I T 17
we ys i s not s aft' i c i ent to ... , nrrant s u ch s ize s ; moreover , the co st , ... ould
probAb ly exc�od th ct o f th e d e s i �� propo s e d .
�?. . :J.lory ho le . Th i s ,·m s the ty1)e '.'.>r i ·- iM l ly pro po se d ;
but for � mu ch S!"'. �. 1 1or cr.; ,e c : ty . For t'!-w c T:, r?c i t ie s no·:, f i xoj , gn t0s
on the crest wou ld _ t- , . n.;. c l! s � rJ ry . Th,.) v�rt i c ri l �!lo ft ··: r; s the pr i nc i pn l
ob ,i .: c t ion ; 1J nd ·.1�1 i le � t r.: ight be po s s iblf' tc) d \� s i '.""n � sri l l·:my o f th is
typG ·7i th en i �c 1 i ne:d sha ft , � lo n :-; expe r irr. .;n t �1 l ��ro �r · 1P1 \·;,)uld h tJVe
boon requ ired , � 1 th no a ssu�snce o f rea ch i ng � s � t i s fc cto ry des i �n .
J..s i t ,·:as d ..:} ::; i -r0d to fi.x i n the spc c i fi c n t irm� , .'='I S ne ar ly A S '!)O s s i b le ,
the �oncra l type o f s n i l l•y qy to be used , enc: e s no t imo n1 s �vn i lnb lo
for e xper ir.".·:.mt s , t.� e ,(l'lo �y ho le �·r '1 s '1b�ndon0i .
'53 . 3Di ll·· : :rs ·.'' i th 10 ,•1 o u t let V\3lo c i t i� s . At it s l r. t e � t
moo t i ng , th -:; �.0 �1r i ..:. xr,:· ::; sf .:? d 'J ·:: i sr, for t t u i i ·J � o f s :-; i ll· . . , r· �r out k t s
using � ve lo ,! i t :.r no t ex c !� od ing 100 fee t p\1-r s :i co !".d .
64 . I t i s no t T)r� c t i c r:ib le to r k str-') Y su f f j c i �-nt \:n • ! r �y be•
twaon th\1 r ,3 scrvo ir .... . . t�r su-;- fc;� co f'!ld the <i i v .1 �' S ion tun:-? 1� l s to r0duce
th-� v 1lo c it :,r to l'JO f ... � t p•Jr s o �onri . At t 'i . , i "t.:rJ! t ion 0f the sh -i ft
;; ith tho n iv .;r s ion t unne l , th,J v.:- lo c i ty i s · • !"i - Y 1t l'7 j r ... �\ - t Pt: r sd cond
and t h� V.310c i t y hc [ d i s �?f. feo t . Th :J �.- --! L c! i +.y '1 � t:1 d for 100 f•:L: t
per sacond i s onl�r l5t� :C-3.;; t ; t� d d stroy th � ,j L 'f.:;r cncE· �.-,ould , c t
, maximutr. C " p 'i c it :; , · .. mt r i l tho �b sorpt ion o f no rc th �n 700 , 000 horse-
po·.:-cr in o � ch sh e ft . Any � t t�mpt to incrc nse � i c t ion to such ��
extent ._,,ould rasult in t- gr'1 ater men � ce t h!'Jn the ve lo c ity .. .,h i ch i t
i s de sired to avo i d .
67
(
•
65 . Three J)O Ss ibi lit ies present th�mss lves ; v iz . ,
( e } tunn�ls along the canyon wells P t o hi�her elevo t ion then
thd d iversion tur.nels ;
( b ) risers et the outlet ends of tho d ivar�ion tunnels which
would force then to run full , reducing the 7elocity to about 102
feet por second ;
( 'c ) spillways on thl3 Arizona sido only , with tunnels loading to
Spillway "!Tesh .
66 . Since tunnels along the canyon wells must hove e fixed
length , the minimum cost w ill be given by t·he h i�hest vulocity. Es
timates wvra ma1e ua1n� � vulocity of 100 feet por second . The use
of separate tUJL"lols would make i t possibl0 to us.:? all four diver
sion tunnols ror pcnstocks , oliminating the 30-foot pcnstock tun
n::,ls� and to place outlet volvus in the two outside tunnels, r<.'duc
ing somewhat th� cost of the canyon well outl.�t ·,.,orks . A slight
shortaning; o:t, tho oute:r n ivr>rsion tunnola ""OUld also rosult from
this plan . A plan of this eel-tome is shown b·t Exhibit 18.
67 . The outl.'.)ts of thes� tunnels would be et about olava-
tion 900 , soM0 250 feet P-bovc tho river intr:, ·1h ich th� wet\,r must
find its way. Two tr�ot�onts of tho outl�t ere possi�lo . Th� first
is to construct a sr.eft from tho olovP.t ion of thu tunnels to the
river bed ; tha velocity in this sheft would still roach about 175
foet por second. The, second i s to allo� the ,-1ator to drop along
th� faco o f th � cliff , or to build a lip so thet th� tre jectory is
ent ir,;:ly in � ir.
68
68 . The use o f � :::· i s er o t the lr:r ner end o f the d i vers io n
tunne l s wo uld f-:>r ce ther: to run fu ll , w i t l� P. ·,elo � i t y o f 102 fee t
per s e co n".1 . Ib ·:.1e"1e:- , -t: he :--.o ) : t h o r t h -:: r i se�· ''.")U l 1 h -: ve to be nt a
d e fi n i te e le v� t i o n , wl: i ch ·.•.,c, uld b � fixed by t i..se e Dt i ?r.r• t ed lo sse s i n
the t unne ls � t �ax i�u� c �pe c i ty . Tha s e lo sso s �r� j i f f i c u l t t o e s t i
r:1a t e ac c ura tely , ,.md d e cre � se rr.p i d ly r1 s t :1 ,� d : LJ � : · &r -:e �l ecre8 se s .
I t was n:, t ro u:-id po u: H. l,! t0 dcs i ·m l)n inlet 1:; 1 i d! wo u ld o ·,o ict n
hydra u l i c j u� p to � f '.l ll tunne l o 4; some s t n r:i:� . A hyd r�; ul i c ,i un�p
i n n t unnel o f th i u e iz e �o uld cau�a s e r i o u� d i stcrb � nco s .
6 -J . "7r.e �..i se :) � s � i l lw�y ·,rn sh n s !�n o u tle t -,:o u ld rc ;·; u i :·e
th:-i t t h e: s p i ll·:P' Y �e '"\ l a ced :3n t i ruly on the A� i zi:me s i rl ..: . Si nco t he
G l � v0 t io n o f t!lr:! t 1.mnt; l ·::ould be lo'!: 0r for h i �!:C;r v c lo c i t i a s , re
q u i r i ng; �m i nc rc· n :' .:..: a h. nlsth o f t,J nn ·.) l , p::-c l irr. i n ri r·:,· e s t ir:m t :; :1 · :ore
made fo r r. i ff :: r , mt �; :.- 1 o e" i. t i · · s . Th e se s da:-::1( s ore c:�o '.."n on Exh i h i ts
1 9 t o 2 1 . Th ,; co r: t c.: c t ir.;�· t ·.: 3 in c lu':lc no th i n� �'J .!' pr , . .:- r. �: 1" t: t i o n c, f
t ho ch t1n:10l h .; t ·:,� tJn ti, ,.; e n ·1 s ) f the t-:.mnc l u u t .::.. u t c Tt �: ., :vi t h..:: r i ve r .
Lf;rp0 �no un t .s o f �· :o n'-' y · ·r� ul� h ._. r,.:: o u .;_re ·l t "J -;-; '." .; ·; mt ;_;r'; e io n 0 f th i s
·,:esh . Wh i l .3 t h,J ·.J r0 s i on o f i t t,e l f � i �h : n :> ., · ": s Jr ious r' ri t t-t�r ,
t h ,; d cuo s i t i rm 0 1' t"!: c c.f!"') d ,� d ��t :1r i r· l i r. °t T r 5. ·.r ·:n· ·.•·c uld forn 8 dAr1 ,
°h P c ki nP.' w r t 3r o:ro urd t h o pcrer ho1.r n t') , pr-,) t ··, . . l � · : .· i. th d i s r: � t ro u s re
s ul t s i n c g s .; o f n 1 :.- :! · i"G fl · ,T thro u�:1 t :·.o :.· -;-, i l l· · ·:1�ls .
70 . Th e, c0� t i:J f thG n ir ious p�, r; n� J 1.1s t d i .f.; CUSS::!d oro � i ven
in t h0 fo l l0-:-· in� t r:1 lc . Th,:? i ncrc [i s � in co st over F:nd !l hove the cos t
o f tho dru.T. go t o s p i l l7m:,·s t P.kes e c coun-: o f sev i nr"s me de po s s ible by
tho r e&rr en �,.:;l�:(mtz d i scussed i n p 9ro�r1Jph 6-3 . r.o s t s i nclude 25% for
e ngi neor i n � , sup8rintondoncc and cont inn.:onci ,� s .
69
!J/1
""
,
'!'ABLE VI
0091' OF SPILLWAYS USING OUTLETS OTH"'m THAN DIVERSION �S
. GAtos .
. (1 ) 4 - 16 X 100 :1 -
. (1 ) 4 - 16 X 100 :1 -
5 - 20 X 100 . :1 -
DRID! G.\TE cro:STS
. . . Tunnels I.Dcotion :Volo citz:Total Cost : *Incro sse
58.6 feet · :Along river . At>uth at : . . . : El •. 900 •. • · 100 : 311 ,400 , 000 :$ 4,700 ,000 .
58.6 foct :Along riv,:lr •. raiort to : . . • · . : El. 526. : 100 : 12 , 400 ,000 : 5 , .700,000
75 f'Jet : To Spillway Wesh (2 ) . 100 : 13 , 500 ,000 : 6 ,.700 ,000 . . 5 - 20 X 100 :2 - 75 feet : To Spillway Wash ( 2 ) : 50 : 18 , 900,000 : 12 ,000,000
5 - 20 X 100 :5 - 47 . 2 feet : To Spillway Wash (2 ) : 50 : 24,000,000 : 17,300,000 . .
* Lvovc cost of 4 - 16 x 100-foot drum gat0s sho�n by Exhib its 1 �nd 2 . ( 1 ) Eech of two spill:-rnys.-(2 ) Cost of work on ch�nn -:-1 of 7:c:3h boloTT end of outl· �t cuts not included.
i
\
�� ff-,.�::-;:�, :�+- _ _ _ __ _ ___ ___ ) ,;;_] ) , · .< ;.� 1 � ; 0 � ;\ ;;7<:; : 7 • 71'
;,_-�V;:: e ;= I
� \..___ • - '
' • I L: f--l_ 1
. It -- - - - - _ __ _ J_JJ:-- - - - -,- -- -- - -r -;-?------- -- -- -� �
? -· . J ,,J J ,Jr- ; r r"--1 '\ "---, .........:...._ J /
�
--- - - - - - - - - - - - -- - -
58.6 ' SPIL-LWAY �-- - • • • - ·· ·-- �
cYr_O, \ �---. .; '-'"\. . '-- - --� � ' L --- - - - - - - - - - . . UNNEL :,.,-• • _ _ - • -
, " . . � ........ - \ ' l '- ------, "' / \.._ ·····-· ·- "'
'"> , •• .._, . - . � _,· ,,.._'X/ • •. ,....., • V '-" ./\ . ··------- :�--.....,�. dJ / - -·-····--···!'---- -----··�- - - - - - -�:t. ___ - · - ·-- · ·--·?Sv··· · · - ·:,lf··-.. .r---;:r-..,,..--- ·- · · ¼ - . . ·- - • •.• . . • · · · · · · - · . . . · · - - · � -.1 .. ./'� -..--.,_;.· .... £�.,�--·· - . . �-�--- - - - - ·- - ·r·"I._:,,--- -- · :· ··- ·� _;_�
.. ,.__.,---�
"' ,.-·
� '. : ,' i ' •._j "" � � :.; . -�,-: ·:·'I ,.,,,--.r "S"'"i .
. ,
' • • ·
• - . . . . • · · · · · · ·· - -- -- · · - - - - - . • - - - - . . ··.- . -- - - - - - - - - - -
TUN-;.,,£� 0
PL-UGS
,,.,� • • . • i;- · - .. -
\ . - - - . -,r/· - ..,_��' - - - - - -- - -�- - - �� UN�t:L �tLfGs�""::,- - - - - -r-,,f - - - -- - - - - -�:i.�
� / \. ,,·· : ... 6 , 7 5 5:,dr C-o•,.;. · l _ _ / o · -����:;;{', ' 2-_ • • \ ...... .--····__._....,._,,J
·tt-..----..
-�
- T�·-�-·�········· --·-·····-·---·--·-··-·- --· ----- -- - - - - · ·:·-��-r · - --,1- - -- ..... · ··· .;., · · · · · · · ·-··�:- ···· · · · .,., . . · . . ·-.,_�.·.::.___ :2 :�
·· , . ./ . . ····· .. J-.... -·
.___"='==:-· �,��- ' ./ . . . . . ,-. . . . . . . . . . . . . . . . . .. . 5.��':!��.R_���."!.u .. �---· · · · · · · · ·· · · >- · - · · -�·� . . - / .. . \.. ·- · : _:,?._.�E':'����� ·.,.1_�'1':'.��s -- : .. ,.-c=:.':-. . .r",.... •.• ' ; 1 . '. . • • ;1-0·-·J-· ·- ·�
_-:.��-i-- -Y-- ···T··- .. '5, • • lt -·. - __ _.,, --==------... ,,......___ - .,- -.-. v ---- ,,, '-- . ' J .. J
• � • • • • •
1/ ..,� ->--;-_. "Lf ;;·-� , \. .. ____,- ' _ · I J' • • • • , ' • : , ' • • .'ll Conduds ·, : . 1 ·- so·x 50 Stoney Gott,
.. .,_. -. :...J ?-�i �-- '----' �,.___n
· · . ·----- .... · • ,• · .- .,;· , · · . · .,. ;.. ·• ,2 s· ... 6,r ,
; .... ·· ��'-
.____... _ _ . , ,··
. ·· ,.·,..· / _..,- , • . nsr ot,S • ' t . •
.. �·�c, _::·:.'.".:,._·: • · • . ,.-/
,1 ·
Ccncr.,, o.J ,� , , _ ·· --.-. .. • "'- .,-· _ ---�....- ·� . ·
�
· . • /.J'/ . 1 1 ,Pr�_·10''5� ' ' -:
.
· ,J· · =·-:--·-:\ , . ..: J ·'. - _,/
COL<.>H. \ IHJ u , , . 1-: u
Cc�r" .-! � ... r .. hoJ I ............. _.
�
rosNo:· · · . ·•• • r
(� / _,,.< · .�-. /'\. \_r.f' �
"-'
'"•··
· --���y '
., ---... ' � / / .- . . -� � --_ .. --v .. . .... .. . . .. ]. ' , ...,_ '-- - ,. /
• • .,.. • � -: · • · 1 , . . . . . . . . . . . .. . • ... ·-�
....._-----.;,.._ ,rt\.._ ..... � .... -· • � • , ' �., � L-- . •
• �AKE rowcR?, .,.., / �
�- / -·r ,_;.._ _;-,, ... :�· . · . CA,.>'fJN-WALL cxiii.cr wo"�
.,: • • 20 ........._,___ •• / I --.........:-··.. , . ..,-.-.A'. ;�· • : _.,. -;:.,.,, ; • :1.,-- , __ • . • , .. d� ·•!�"r . · - �<>'- s·•or • ":":•
/
�- � , , �- � \ _,
� o, .,. ,: I . . . • ---:d. . . . ROCK
,,.,., ., ..,. "� Ou�prl Q:,c. 1'
I
-- - --;·-�: : :.� i: · BARR/£.
R
(
[;-=-= :. :. :. :. :..:.::.:-=--- . ' . . -'' ,. ... .-- , I � -�"' $Ji; � ,. ,
UPPER C
.
OFFEROAM
'[:
• fH ·S.·:,. 1 . , •• ·"' 1
\
H O O V E R \ LOWER COFFERDAM
DA M I POWER PLANT
� \ f':=-=. .,-=:::-
' \ \ � ;--::-== .. -- �.,, ., - � .. � \ \ . · . . ��"···��· . ..,,
. � , .
. .. . � , , ' ..:=--1
.
�
......._.J""'..,....._· \ . � : r r '-"- \ \ -� �J+-.,.... . • � _-._ -- � � .J G i . / , . � ; -��,...._;___ ' . ,_
� . ·. - - ·. : ... v,-...r- . ; :: : ; . ��. : ;·-V. : -.�·.--.:. �
""
� .....-i •• •. ' ·• :- ' ' • • • : • . - �
- �- , · . : '- . , �·· .
_
.,..
. - . ···· ·· - . ·· ··.-··········-··---- - , . ,�4. . . . ·,. :-:·.- ... . ... r--- : . . . . · , .. . .· . _ ... ······•-.. �-;?. DtVE:RS/QN TU''NE
,c-C:I.S-··· -·...---••• __ • .u I . ,> ' • • • . : '11 . ; : • r . '- "<, • • ' • • • • ,· _, ... \,; ····· ··2········': . .. . . • 7
n· �f.- -. � . .;, . . .. _:,_'-. ,• _ • · _ ; ,Pensfocl(( )· ; ) __J
<·.'•.). p;_-�/:-;-' � ,-.' ( \ .-·-··---. . . ' • ' ', :.-·,··-· .- ' , ; · : "f , , ; , , , .,J .-;, ·.---��. , ,r,,..: .. -."{!Y
- - · · - · - •, ' ' · ·-=--.. " , . 1, • • , ' ' ,"''-':0- ,
, · .- · · • , x,r.,.,.1".,.
- - - -
-
- - - - - -\ - - - - - -"-� -�- " - · • '"' .. �
-�
-
- · :-· · - �· ..
..
J .. , •
-•-- .. � .. - ·:.:�, .. , ., .... ,c::..��· ·':-z·:/:
- -- - �- · -- - - - ·- - .;_.,- TUNNEL PLU.GS Ai
r ,· · · -'· • • • .' , -t ,' , f- • •• • ' ; • .- ,• ,• ,' �:· •;·�!-�,· . •
� -- - - - -- --- - -- � -- · - - ---- - - • 6 < 15 St ctr Gair,) ' 50' PEN� · · - ·- �;� • •
\
• •• ·"- · ··· · · · · ' ,, • ' •' .• ,·� -�· •.
•-..., . ---• - -•- . ...• ,.._ _ _ - -- -� 1- -} _ _;._ :!.._ . , CK TUNNELS;._ , • ::_ ·· - ' · ·,•.� --- ·-·1-- f ,.. __ ___,...v / .-/' ';'•' '•,
' ., -- - - . . ... . V ' • ,�- - - • • . . . •_/ rr:· i , - - • • • • . -- / _,, .; • •
�
--
,, \ -� -·· --i_;}-- ·- ----.:-·f}- · · - · · - .���r·_·:· '- -·�- .-,_,1� : .�?.. : . . . . . _ , ·_c-.,._��-=-:.·:-"� . ---- - . · - . �-. - - - �' - - : · . /' \ / . .. . . ... .. . . . � "\.- ·::·--:-'··· ·7· ·.1 ---: -- - - .
t - - ---- - • .)_, _ _ _ .... • • · ··· · - - · • • • • • -<• ) .�---· -,- - - - · - - - - • I • -•
r-----
� l-_:vA�� ���-�AY ._,1j _ - - - - - - · · ·/·· · ·····./. · - · -- · ·�!-�--��.!::��-:-.::.�ttt·�-·°r-.·-- -- �- ·- - · ·-�\-_::7·:::-·,-'·"f·u- 1
I •... __ -!!) -'1 � •
• r I j NOTE:
, ! , C • r•, JO' cod \; <\ , • , •
� . r,.._ ) 1.. ., ,. r-.. II Ptns• .--., :;:-,J •"'f ;
art Prusurt ru.,nr s ·
·1 1
�
\
':' ' / /
'v
\ ,.._.., ,... �-�
,. ·- .... �. J ..... .,..""°"' • , •c:�·,o• .. �,,. :A ... .-0 .. PA!"! cc•
HOOVE:/:l DAM !)AM A.AID APPURT£,.ANT WORKS -u:rDt/T·SCPIIRA'C Sl'IUA'AY TllltlllctS .... _._ ,. -
• •• -�-oiro .. - .:: .. .. .,..-.,..- 145-0
EXH I BIT 18
r .
-
�: . , ,,,_ ·�-- -: ·,; ( :.,.
/:-J,-.
<-
� .'t" ..... �-- �t '\ ' .
, _/. - I• •
v,,,,,..-- \ , -.... , , r_ • · , /\. ...
,...f .... ...
. ,.. -- 1
t'
I I
� W\ _ _, .,. _...... _.,.. ....., ..,._.�..,__ ..... ,.,........,.IIL
-
S • 01£,E,
_ ... ...... S!o 49 • 00 Bottom El 90'2.90· •••
' �'t '}' � I �
·, ,
,ir-:...- . _/ ,· � � 1··
-.....:;; r.
... ·, � .. ,e,qoo.
·-
--. __ . ... "°!. ...... _ ..
�
,..,
_ ,;_�· -,
..._ .
.,,,_ -I h.' 1 • ;:;;. , R �� . r . - I I� _j__ l --- ,--'-.
I I /
__ / r I
A• � : •
.r ·
' .
Of P/llrrMENT OF TMf INTfRIOA
BURE/IV OF RECLAM/ITION
BOULDER CA.HYON PROvECT
HOOVER DAM ALTERNATE SPILLWAY LOCATION IN SPILLWAY WASH
ONE 75' HORSESHOE TUNNEL
OltAWH W L A
TIIACCO
CNCC•l'O
su•,-rrTso
lltC�M6HOC0
Ar,,lltOVl'D
Ot:HVt:R.CO<O, OCT 1$, 19!1 145·0· )466 EXH IB IT 19
\..
'.� / -, --r . _., ,., .
' V" • . r, ' .'••·
, ,1 . \,
fJ ....... ).'· _.,..;. � �
</ ·
I I
... ............... ._._ ...... _,_.. _..,. ............. ...... ...,_, .. --............. ... '\. I
'
' ./' . -
�Sta.40• 90 ·_._ ... Bot� El 1074�----··
. ..... ·'
/
�·
� .' :-->v-1 �· ·- - ' ; . ---- ...
''-
-� ' '""""
' .
, /� 1.,..- , -
..,,-
- I r-
' '
A •tt"
\ . ... '·
\' �.
OE.PAfU.,.E.HT Of' THE. IMTU'IIOR BURE.AU 0,- Rf:CLAMATIOM
ftOULOUt CANYON P"OJCCT'
HO O VE R DAM ALTERNATE SPILLWAY LOCATION JH SPfUWAY WASH
TWO 75' HORSE SHOE TUNNELS
OAAWfrrt W LIi 1u••rTTC'D
TR•Cco lll'C0.,,,..,.,,01'D
C�•CKCO A,..._,��D
oc....,cR,COUI., OCT ''·""' .,.5·0-l't67
EXHIBIT '20
' ....
.... ;' ·' ......... �
v'
��1-l � -. t.1 �
Q• 400.000 S.f . .. t. : \_ l , :n \ -:JID71'J)f( Res. W S El 1'23'2.0 ,
· , f,t'
��:,.i/:1l'tll:( . �' · �.�_$ft
';..
..Jr,=· .. /, 0 • 63 000 S f ,., l . · l "
... . ' //A Re�. W ,s. El 1129 O ..,_ �- ,:' \. i. �:..-.,i ·
..,. ':,.Jo. $· 20 x 100 Drum 6otes � , � �- .! ·� -:'v-; • · Weir Crest Gates down El 119$8 ' � \ ,
. , '\ '��---
. . -�.��- ,- . · :--. �.;- ' .
' \, -- 1 � . ii-" • .Sta. 4 ,00 · . -_,_J . .._ , �\ Botto_m El 1 182 46 w---� · \,___ J' "-'� - --: ,..:' j , V•SO/sec. 0 • 500 '-:�- 1, :" \.._' •
"-'·
...,_ · � . -,. -� . ' ' ,, .
, , - . . ' .,, \_ ._,, ....... ··'\
·. 1- -· ·�
O(PARTM£.. ... .... or r�1E IN1f;�'OR
BUR[AU Cl/ RECLAMA• ' ()N
BOULDER CANYON PROvECT
H O O VER DAM ALTERNATE SPILLWAY LOCATION I N SPILLWAY WASH
FIVE. 47.2' HORSESHOE. TUNNELS
'.
==========�--=::=::.-==--�� -'
( OllfAWH
'""''" W I R SVlJMITf"CO
ncco,.,.,.,.,:,.,rirri APµ�ovco
Uf'NllrR, COCO . OCT ,s.,931 I l+S· D· 1¼8 EX H I BIT '2.1
_ ..
• � -