Su

Dagendivrun Duandmebe Proan In everedthe Thana

Ke(ExriskAff

mmary

ams are classneration, recrversion into noffs, ground

uring extraordd infrastructueteorologicalgenerated by

oper monitoroperation po

this article, ents and on sduced the rise dam.

e operation oalysed.

eywords: suxtraordinary k, CTOOH (

ffairs, Conagu

D

G

Head

Ma

sified based reation, fish ditches, can

dwater rechar

dinary hydroure located d, hydrologicay a sudden di

ring enables olicy in accor

the policy storage levelsk of damage

of the Cajon

urplus workHigh Water

(Technical Cua), hydrolog

Dam

RoGeneral Dire

Dr. VíctDe

Ód of Hydraul

Hanager of Su

on their usefarming, etc

nals or other rge, sedimen

ometeorologidownstream al and hydraischarge or d

adequate anrdance with

implementeds managemee to the popu

de Peña dam

k, design fr Levels), Mi

Committee ofgical forecas

Mana

oberto Ramírector, Nation

tor Hugo Alceputy Technic

Óscar Sánchelic Engineeri

oracio Rubio

urface Waters

e under 3 typc.), diversion

conveyancent control, etc

ical events, ito maintain

aulic forecastdam failure.

nd timely dethe evolution

d by the Naent of the couulation and i

m in Jalisco

flood, OHWinimum Watf Hydraulic Wst, volume, sa

agemeCajo

rez de la Parral Water Com

cocer Yamancal Director

z Montufaring and Elect

o Gutiérrez s and River E

pes: storage n (to provide e systems) anc.).

it is importana permanent

t scenarios in

ecision-makinn of the reser

ational Wateuntry's dams infrastructure

during Hurri

WL (Ordinater Level OpWorks Operaafety, model

ent inon de Peña D

ra mmission

naka

tromechanic

Engineering

(for water suthe hydraulind regulatio

nt for the saft surveillancn order to red

ng on storagrvoir and rain

er Commissiis describede located do

icane Patrici

ry High Wperation (MWation), SGTlling.

n MexDam, Jalisc

s

upply, irrigaic load requirn (to retard

fety of dams,e on the climduce the risk

ge managemnfall forecas

ion to monit. Its implemewnstream, a

a in 2015 is

Water LevelWLO), opera

(Division fo

xico co State

ation, powerred for theirstormwater

, populationmatological,ks that could

ment throught.

tor weatherentation has

as well as to

particularly

ls), EHWLating policy,or Technical

Dam M

Damin MCajon d

Objectiv

Assessingmanagemorder to infrastrucand presethe commgeneratio

Introduc

The Natithrough authority severe wbasins, chactions to In order storage leare recostations aand oceamonitored This allopotential could rapreservoir.This is ddeterminicontrol sreducing to the popdefining controlledalerts to t

Backgrou

In Mexicincluding

Management in

m MaMexicde Peña Dam

e

g the importment of stora

prevent damcture and comerve as muchmitments on

on or other use

ction

ional Water the Technicato monitor an

weather evenhannels and so mitigate thei

to meet thisevels in the 20

orded; informand 600 hydran water temd.

ows determiniformation of

pidly increas. done by evaluing the disctructures anddam failure r

pulation and ithe operation

d discharges the population

und

o, policy mang reservoirs i

n Mexico

anagemco m, Jalisco St

tance of the age dams in mage to their mmunities livih as possible

drinking wes.

Commission al Division nd assess the

nts that maystorage dams,ir negative eff

s objective, t05 major dam

mation from rometric statiomperature an

ing in a timef an extraordie the volume

uating expectcharge througd surplus worrisks and previnfrastructure n policy to c

and issue n.

nagement of Hs dictated by

ment

tate

operation athe country structures, a

ing downstreastorage to me

water, irrigatio

(CONAGUA(SGT) has tdevelopment

y influence t and impleme

fects.

the variation ms in the count

1,000 weathons is gatherend weather a

ely manner, tinary flood the stored in t

ted inflows agh opening rks. This allowventing damadownstream,

carry out timeearly warnin

Hydraulic Wory the Technic

and in

and am eet on,

A), the of

the ent

of try her ed; are

the hat the

and of

ws age by ely ngs

rks cal

C(Ccokn Vevdathde Inprevinthcacairrre Thteov Hinduhuer SGpochdithflo SGthin

H

FrinfaTa20

ommittee oCTOOH), whomposed of nowledge.

Various scenarvents and theams in the couhe most appecision-makin

n order to surovides evidevolution; hydnputs of 2, 2hrough continapacity downsauses no damrigation sche

equirements of

his Committemperature. Nver 27° C.

Hurricane season the Atlantic uring this purricanes generratic trajector

GT has reviewolicies of thehanging the ischarges in ohe "steps" belooodwaters we

GT steps up ithe case of Huntense hurrican

Hurricane Pat

rom Septembn the Pacific reavourable conable 1. This 015.

of Hydraulichich is a m

experts in

rios on the eir potential iuntry are analypropriate co

ng on operatio

upport this ence, such adrological fore25, 50, 75 annuity equatiostream of dam

mage, water voemes, drinkinf the national

tee also keepNormally, hur

on in the Paci1 June, both

eriod monitoerally evolve ries.

wed over rece 50 dams t"abrupt" extr

order to reducow OHWL weere revised to u

ts efforts durinurricane Patrine in history.

tricia

er 2014 to Megion tempera

nditions for hsituation wo

c Works multidisciplinan different

evolution ofimpact on strysed in the CTllegial and n of dams.

decision-maks: record of ecast of resend 98% of oon modellingms, whose watolumes extracng water deelectricity sys

ps track of rricanes get t

ific begins 15h ending 30 Noring is incr

dramatically

ent years the that have sucractions for

ce damage dowere removed aupdate protoc

ng weather evicia in 2015,

March 2016 anature occurredhurricane devrsened during

1

Operation ary group areas of

f weather reams and TOOH for

technical

ing, SGT reservoir

rvoirs for occurrence , channel

ter volume cted under emand or stem.

seawater their start

5 May and November; reased as and with

operating ch policy, smoothed

wnstream; and design ols.

vents as in the most

n anomaly d, creating velopment, g October

Page 2

Date

Sep 14 Oct 14 Nov 14 Dec 14 Jan 15 Feb 15 Mar 15 April 15 May 15 June 15

T

Hurricaneintense tWestern winds of

OriginatinGulf of Twas firstOctober. conditionOctober, hurricane

At first itKenna anOctober hurricaneintense hu Hurricane

Patricia

Linda

Kenna

Odile

Table 2. Th

It was corecorded forecasteddamages,

Anomaly Temp.

0.5 0.5 0.9 0.8 0.5 0.6 0.6 0.8 1.0 1.3

Table 1. Anomaly

e Patricia catropical cycl

Hemisphere 346 km/h.

ng from a sTehuantepec int classified a

Exceptionallns fuelled exp

Patricia grewe.

t was considend Odile, hoat 3:30 am

e beating Huurricane in the

Date

20-24 Oct 2015

9-17 Sept 1997

22-26 Oct 2002

10-19 Sept 2014

he most intense hu

onsidered the in Mexico

d to caus, images 1 and

Date

July 15 Aug 15 Sep 15 Oct 15 Nov 15 Dec 15 Jan 16 Feb 16 Mar 16

y in the Pacific tem

an be regardelone ever ob

with maxim

prawling distn mid-Octobe

a tropical deply favourableplosive intensw from a trop

ered as seriouowever, withi

m it became urricane Linde Pacific. Tab

Max wind(Km/h)

346

295

270

220

urricanes in the P

most intenseo and worlde potentiallyd 2.

Anomaly Temp.

1.6 2.1 2.3 4.9 3.0 2.8 2.6 2.4 1.7

mperature

ed as the mobserved in tmum sustain

turbance in ter 2015, Patricpression on

e environmensification on pical storm to

us as Hurricanin hours on

a Category a, as the mole 2.

ds Pressure(hPa)

872

902

913

918

Pacific

e hurricane evdwide, it wy catastroph

ost the ned

the cia 20

ntal 22

o a

nes 23 5

ost

e

ver was hic

Im

BmphwceJalo Bwstofprev

Image

mage 2. Hurricane

ased on the imodels on the

henomenon, itwould affect wentral, coastaalisco States ocated.

etween 20 anweather warnin

ate and munif Hurricane Protection provacuated, and

Dam

e 1. Hurricane Pa

e Patricia at 7:00

information pevolution andt was determiith torrential r

al and mounwhere Tom

nd 24 October ngs to inform icipal governmPatricia to tiotocols. Popshelters were

Management

atricia Trajectory

hrs 23/Oct/2015

provided by fod movement oined Hurricanrains of 150-2ntains of Comatlan river

CONAGUA the public an

ments on the imely implem

pulation at installed.

in Mexico

forecasting of weather ne Patricia 250 mm in olima and

basin is

issued 15 nd federal,

evolution ment civil risk was

Dam M

AccordinOctober reported Categoryin the vNavidad Estrecho,in the muJalisco, im

Image 3

The eye was expeduring thof 305 kmoving to

Accordinthe Worconfirmedsustained Due to damage cstrong wiinfluencesuccessfuemergencissued byfrom prevevacuatedwere crea

Management in

ng to Weath2015, the Nat 18:00 hrs.

y 5 Hurricane vicinity of Te

Bays, a reg, La Manzaniunicipalities omage 3.

. Hurricane Patric1

of Patricia haected to continhe subsequentkm / h windsoward the nor

ng to the bulleld Meteorolod Hurricane

d winds of 346

the magnitudcould be expeinds and high e, image ully implemcy protocol bay CONAGUAvious disasterd from their hated.

n Mexico

her Alert NNational Wat. Mexico CenPatricia woul

enacatita, Cuion where thlla and Melaqof La Huerta

cia impact zone, 218:00 hrs

ad a diameternue entering st hours with ss, gusts of urth-northeast a

etin issued onogical Organie Patricia h6 km/h.

de of the hucted from therainfall over a4. Mexica

mented an ased on based A and drawingrs. Thousandshomes and ove

o. 068-15,er Commissintral Time, thld make landfestecomate a

he towns of que are locate

a and Cihuatlá

23 October 2015

r of 10 km asouthern Jalissustained win

up to 380 kmat 22 km/h.

n 25 April 201ization (WMhad maximu

urricane, sevee combination a large radius an authorit

unprecedenton the bulleti

g on experien of people weer 1,000 shelte

23 ion hat fall and

El ed, án,

,

and sco nds m/h

16, MO)

um

ere of of

ies ted ins nce ere ers

I

Canreth

ThsuthvoTa

Image 4. Rainfall

ONAGUA thnd the conditieceive suddenhe hurricane.

hus, 29 daurveillance in he managemenolumes that able 3.

Imag

l forecast between

hrough SGT mions and evolun inflows from

ams remaineorder to carrynt, control anwere deemed

ge 5. Hurricane Pa

n 23rd and 24th Oc

monitored the ution of dams

m rainfall gen

ed under py out in a timend discharge od necessary,

atricia trajectory

3

ctober 2015

hurricane s likely to nerated by

permanent ely manner of storage

image 5

Page 4

Table 3.

Of all dadam was it was locthe hurriczone; it hOHWL (materialsinhabitanINEGI ce

Chart 1.

Aguamilpa, N

El Cajón, Nay

La Yesca, Jal.

José Ma. Mo

Cajón de Peñ

Trigomil, Jal.

Trojes, Col.Tacotán, Jal.

Basilio Badill

San Juanico,

La Vega, Jal.

Laguna de A

Vicente C. Vi

Laguna Colo

Tenasco, Jal.

Copándaro, M

El Trigo, Jal.

Santa Elena,

Sant iago Bay

Guadalupe VAchimec, Za

Excame, Zac

El Chique, Za

Tayahua, Zac

San Pedro Pi

San Marcos

El Cazadero,

Jocoque, Ags

Niágara, Ags

N am e

0

1000

2000

3000

4000

5000

6000

Cajón Peña

Mo

. List of dams un

ams under surconsidered to

cated approximcane; it wouldhad a storage (466.69 hm3);, Chart 1 and

nts were livinensus of 2010

Most relevant dasurveillance du

Pr

Nay. 4

y 18

. 16

relos, Mich. 4

ña, Jal. 48

. 24

214

o, Jal 1

Mich. 5

4

mela, Col. 3

llaseñor, Jal. 1

rada, Jal. 1

. 5

Mich. 6

2

Dgo.

yacora, Nay. 13

Victoria 8ac. 7

c. 5

ac. 13

c. 3

edra Gorda, Z

Zac. 2

s. 1

s 1

e dam

dea

Trigomil Trojes

onitoring dams 

% fi

der surveillance dPatricia

rveillance, theo be the most mately 60 km d be the first of 480 hm3,

; it is a curtad image 6; anng downstream.

ams by storage cauring Hurricane P

resent N A M

4850 554

899.64 2551

687.55 2292

482.9 540

80.87 466.

48.92 250

19.41 220.49.34 149.

34.2 145.

57.6 60.4

49.48 44

38.11 38.3

4.44 14.4

3.32 12.

5.97 10.

6.19 6.5

2.58 4.4

14.7 15.

30.15 130.

83.09 84.77.17 6.7

51.82 71.6

39.48 139.

31.63 31.

0 5

s/ d 3.5

22.14 22.1

0.97 10.9

6.33 16.1

(hm 3)

La Villita Aguamilpa

during Hurrica

ill Vol. NAM

during Hurricane

e Cajon de Peat risk, becaufrom the eye landfall impa5% higher th

ain of graduatnd about 13,0m, according

apacity kept undeatricia.

M O

40 87.55

1.7 74.45

.92 73.60

.8 89.29

69 103.04

0 99.57

81 99.3724 100.07

72 92.09

48 95.24

4 112.45

34 99.40

44 100.00

8 104.06

5 56.86

5 95.23

4 58.64

1 97.35

05 100.08

75 98.044 106.38

61 72.36

95 99.66

6 100.09

0.00

5 s/ n

13 100.05

98 99.91

19 100.86

% fill

0

20

40

60

80

10

12

El Cajón La Yesca

ne Patricia

MO

eña use

of act

han ted

000 to

er

Thst

C O It ofTolaup

Thdiofexelsa

0

0

0

0

00

20

Image 6. LocaHu

he remainingorage capacity

ajon de Peña

Overview

was built bef Hydraulic Romatlan Rive

atitude and 10pstream of To

Image 7. A

he dam consisikes of gradedf 1015m, maxcavation, crlevation; clay and filters, ban

Dam

ation of Cajon de urricane Patricia

g dams despy were below

a Dam in Jali

etween 1974-1Resources (SRer, coordinate05° 12' 10" womatlan, Jalisc

Aerial view of the

sts of a main cd materials. Taximum heigrown width

core coverednk 0.7: 1 on

Management

Peña dam in refeimpact zone

pite having s80% OHWL

sco State

1976 by the SRH). It is locaes 19° 59' 3

west longitudeco, image 7.

e curtain and spill

curtain and foThe curtain haght of 68m

of 10m to d with selecteboth sides; gr

in Mexico

erence to

significant capacity.

Secretariat ated in the 30" north , 16.8 km

lway

our closing as a length

from the a 142m

ed gravel-ravel-sand

Dam M

supports covered w

The mainTable 4 a

Crest EHWL OHWL Weir crest Dead volum

It has twunder dikanother maximum Design flthe right

0

500

1000

1500

2000

2500

3000

3500

104

Are

a (

km2

)

Management in

were placed with muck and

Image 8. M

n dam design and Chart 2.

E

me

Table 4. D

Chart 2. Areas-c

wo intake workke num. 2 fone using th

m capacity of 8

lood is 4,380 side of the cu

4.9 109.9 114.9

Dam Curve

a

n Mexico

on filters to ad tumbled ston

Max curtain sectio

characteristic

Elevation (masl) 142.00 139.20 130.37 123.90 104.98

esign characteris

capacity-elevation

ks; the high ifor a 40 m3/he diversion 80 m3/s.

m3/s, spillwaurtain, it has

119.9 124.9 129.9

Lifts

"Cajón de Peña"es lifts-areas-capacity

rea capacidad

a side bank 2nes. image 8.

on

cs are shown

Storage (hm3)

707.69 466.69 321.02 55.00

tics

ns Curve

intake was bu/s capacity a

tunnel with

ay is located direct dischar

0

100

200

300

400

500

600

700

800

134.9 139.9

Cap

acity

( h

m3 )

d

2:1,

in

uilt and

a

on rge

inw4,

Thgepoco

Ch

1

3

5

7

AL

MA

CE

NA

MIE

NT

OH

m3

nto the channewidth, 12m he

,000 m3/s. ima

Imag

his dam ofenerating spillotential of omparison to t

hart 3. Historica

50.0

350.0

550.0

750.0

1-J

an

31-J

an

2-M

ar

N2

el, controlled beight, for a reage 9 and 10.

Image 9. Open

ge 10. Storage alm

ften has hils in different the Tomatla

the reservoir c

al Storage of Cajo

1-A

pr

1-M

ay

31

-May

30

-Ju

n

Cajón de Peña damRíver Tomatlán

NAMO2013

by five radial egularised dis

ing gates

most at its peak

gh storage months due t

an River rucapacity, Char

on de Peña dam, J

30

-Ju

l

29

-Au

g

28-S

ep

28-O

ct

m, JAL.n

20152012

5

gates, 8m scharge of

volumes, to the high unoff, in rt 3.

Jalisco

27-N

ov

27-D

ec

20142011

Page 6

Dam ma As previoSGT kesurveillanof the raweather e

This was rainy seas

By the evolume wOHWL withdrawstorage tfollowing

These cothe Gate of TechSantiago-

A flow osecond hawas reachwithdrawonly to m

420

430

440

450

460

470

480

490

500

510

1-Ja

Alm

acen

amie

nto

(hm

3)

nagement in

ously describeeps nationance, checkingainy season event.

the case of Cson of 2015.

end of the dwas 476.74 h

(466.69 hmwals were coto receive rug rainy season

Chart 4. Janua

ontrol withdraOperating Pol

hnical Affairs-Pacific (OCL

of up to 67 malf of March uhed, and the d

wals were mameet irrigation

n 11-Jan 21-Jan 31-Jan

C

NAM

2015

bed, CONAGUal dams ung dam levels b

or during an

ajon de Peña

dry season, thm3, which is m3), Chart onducted to unoffs generan.

ary-April 2015 St

awals were clicy endorsed s (SGT) an

LSP) Basin Or

m3/s was withuntil 5 April odam was let tde through thcommitments

n 10-Feb 20-Feb 2-Mar

período

Cajon de Peña dam

MO ALMACEN

UA through tder permanebefore the onn extraordina

dam prior to t

the dam storhigher than 4; preventi

allow for neated during t

torage

onducted undby the Divisi

nd the Lermrganization.

hdrawn from tonce the OHWto freely evolvhe water intas.

12-Mar 22-Mar 1-Apr 1

NAMIENTO

the ent set ary

the

red its

ive ew the

der ion

ma-

the WL ve; ake

StE D31chvobe

FrofSeresp

1-Apr

tart of the raiarliest signifi

am volume d12.48 hm3 onhart 5. A decolume and anetween 19 Ma

Cha

rom 4 Septemf 110 m3/s eptember andelease an avepillway and in

Chart

Date W

0

50

100

150

200

250

300

350

400

450

500

1-Apr 16-Apr

Alm

acen

amie

nto

(hm

3 )

0

100

200

300

400

500

600

Alm

acen

amie

nto

(hm

3 )

Dam

iny season: icant runoffs

decreased to n 12 July, ducrease of 164

n inflow of 44arch and 12 Ju

rt 5. Storage in A

mber to 8 Octowas recor

d 5-8 Octobeerage flow o

ntake work, ch

t 6. August-Octob

Withdrawal (m3/s)

1-May 16-May 31-May

período

Cajon de Peña dam

NAMO AL

período

Cajón de Peña Da

NAMO

Management

a minimum suring the rain4.26 hm3 in t4.2 hm3 were uly.

April-July 2015

ober, an averarded; betweeer, it was dof 100 m3/s hart 6 and Tab

ber 2015 Storage

Stored volume (hm3)

15-Jun 30-Jun 15-Jul

o

m

LMACENAMIENTO

am

Almacenamiento

in Mexico

storage of ny season, the stored registered

age inflow en 11-30

decided to from the

le 5

Overall %

30-Jul

Dam M

5 October 6 October 7 October 8 October 9 October

13 October 14 October 15 October 16 October

Tabl

Analysis If the dapreventivthrough reservoirstorage - below EH Followingset to maicontrol adownstreevents we

Runoffs On 20 O489.62 hmwere conexpected level to rhad occudamage acircumstalevel excTable 6.

Management in

175 92.14 92.14 92.14 46.78 23.53 10.60 10.60

0

le 5. Evolution of

am had remve withdrawa

the spillwar would hav

an elevation HWL (Extraor

g this event, nintain sufficie

an extraordinaam from a sere expected.

from Hurrica

October the m3, nearly 5%

nducted to allorunoffs, as w

reach or exceeurred, it woas it is an earances would ceed the EHW

n Mexico

466473475474477480481482484

f storage 5 to 16 O

ained with hals had noay and intave reached

of 138.84 m rdinary High

new control went capacity inary flow and pudden release

ane Patricia

dam storage% above OHWow for new st

well as to preveeded EHWL.

ould had learthworks dambe possible

WL projected

sto6.43 93.13 105.19 104.93 107.77 100.61 101.89 102.92 104.47 10

October 2015

high levels aot been maake work, ta 697.24 hm- that is 0.36 Water Level)

withdrawals wen the reservoirprevent damae, since rainf

e recorded wWL, withdraw

orage to receient the reservIf this situatid to structu

m, and under to allow wa

d, Chart 7 a

ored 99.9 01.4 01.8 01.8 02.4 03.0 03.3 03.5 03.8

and ade the m3

6 m ).

ere r to age fall

was als ive oir ion

ural no

ater and

C

22222

T

ThgemmR

Ww

Chart 7. Evolutio

Date W

21 October 22 October 23 October 24 October 25 October

Table 6. Evolution

he average inenerated from

mean dischargem3/s.

ainfall was low

Image 11. R

When inflow dwere closed and

0

100

200

300

400

500

600

20-Oct 2

Alm

acen

amie

nto

(hm

3 )

Dep

resi

ónT

ropi

cal

on of the reservo

Withdrawal (m3/s)

99.54 351.17 658.59 421.40

0

n of Cajon de Peñ

nflow betweem Hurricane Paes from 21 to

wer than pred

Rain accumulated

decreased afted stored water

21-Oct 22-Oct

Pe

Cajón de P

NAMO

Hur

acán

Cat

egor

ia I

"Pat

rici

a"

ir during Hurrica

Stored volume (hm3) 489.62 480.86 432.47 398.86 394.98

ña Dam, 21-25 O

en 23 and 26atricia was 2024 October w

dicted, image 1

d 20-24 October 2

er the hurricar began to incr

23-Oct 24

eríodo

eña dam

ALMACENAMIENTO

Hur

acán

Cat

egor

ia V

"Pa

tric

ia"

Hur

acán

Cat

egor

ia V

"Pa

tric

ia"

toca

tie

rra

7

ane Patricia

Overall % stored104.9 103.0 92.7 85.5 84.6

ctober 2015

6 October 6.85 m3/s,

was 382.68

11.

2015

ane, gates rease.

4-Oct 25-Oct

toca

tie

rra

Page 8

Analysis

Even thorainfall withdrawthe forecelevationOHWL aThe popu

In the foPacific ghigher thand Table

Image

day

Oct Ci

23 24 30

31

Table 7. R

This raiconcentrabasin cauof 274.38165.74 mOn 1 Novand contrspillway

ough Hurricathan it was

wals helped tocasted storagen of 134.07 and the conseulation was ev

llowing days,generated raian that causede 7

e 12. Rainfall acc

Stationihuatlan Caj

20.6 6198 6395 8

90.3 7

Rainfall record in

infall, the sation from theused significan8 m3/s on 30

m3/s between 2vember the darol withdrawaas shown in C

ane Patricia gs expected,

o avoid the rese levels of 56masl, i. e. quential damvacuated in a

, moisture intinfall in the d by the Hurr

cumulation on 30

n jón Cuale

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n the stations nextDam.

soil saturatioe Hurricane ant inflows, w

0 October and29 October anam reached itals were carriChart 8 and Ta

generated lowthe preventi

servoir to rea62.10 hm3 at

3.69 m abomage to the da

timely manne

trusion from treservoir ar

ricane. Image

0 October 2015

Rainfall accumulation

(mm) 339.5

Patricia

709.80

t to Cajon de Peñ

on, and runoat the top of t

with a daily hid an average nd 4 Novembts OHWL agaed out from table 8.

wer ive

ach an

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ña

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Chart 7. Storage

Date W

31 Oct 1 Nov 2 Nov 3 Nov 4 Nov 5 Nov 6 Nov 7 Nov 8 Nov

able 8. Evolution

nalysis

lthough subatricia were eservoir manaf Pacific moenerated signf the dam

October to 8 eservoir to rea38.99 masl, i.amage to the d

y the end odequate managver the OHWLhe released flof water".

he new polnabled the foleservoirs to be

0

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n of Cajon de PeñNovember 2

sequent runconsidered

agement, the oisture was nificant rainfaand withdraNovember,

ach 684.08 h.e., 0.21 m bdam.

of the year, gement of levL was reacheows could be

icy implemellowing key o

e met:

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NAMO

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ober and 8 Novem

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ña Dam, from 31 O2015

offs from Hfor determi

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hm3, at an eleelow EHWL,

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ented by COoperation obj

eríodo

de Peña

ALMACENAMIENTO

in Mexico

mber 2015

Overall %

stored 97.2 99.9 101.9 102.4 101.5 100.9 101.3 101.9 102.5

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ent the CONimpending exe early warnof factors tha

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perature rise generated con of Hurricanelose watch on

2004 2005 2006 2007 20

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lementation on evacuationcreating tempo

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ufficient wateds.

on 31 December i2015

y is an ongefine reservoirin order to avthe infrastr

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above 27 ° Cnditions cone Patricia, thu

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servoir on 31 Dece

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of emergenn and protectiorary shelters.

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void any damaructure locat

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ember

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measure alloweservoir levels

f withdrawalsHurricane Patri

storage level m below OHWerious risk opulation of T

his new opONAGUA inored a volumHWL capaciroves the prop

A gradual varievels with tandslides in thlso allowed fond to avoid opulation loceleased volum

ibliography

. Dams in Mommission (2

. Operation ajon de Pechnical Affai

. Evolution western and

ivision of Tec

f the Cajon drveillance allo

be conductedvide in adv

n case of pevent risks

hed a storage vOHWL capa

hdrawals cond4 October 2

wed for a hs.

had not maicia the reservat an elevatioWL, which the dam, in

Tomatlán locat

perating poln all dams in me of 491.95 ity by the enper manageme

iation was achthese actionshe slopes or or an acceptadamage to

cated downstme.

Mexico Vol. 2011)

Policy for seña Dam, irs, 2015

of storage dnorthwestern

chnical Affair

de Peña Damowed for a d in a timely mvance a mapossible extr

volume of 39acity, as a resducted during 2015, this fave better c

ade in advanvoir would havon of 684.08 mwould have

nfrastructure ted downstrea

icy implemethe country eMm3, 5.5%

nd of the yeent of the dam

hieved in thes, reducing in the dam st

able regulationthe infrastru

tream from

XII. Nation

spillway gateJalisco, Div

dams in then regions ofs (2015)

9

m, Jalisco, series of

manner in argin for raordinary

98.86 hm3, sult of the Hurricane

favourable control of

nce during ve reached masl, 0.21

place at and the

am.

ented by enabled to above its

ear, which m.

e reservoir risks of

tability. It n capacity cture and a sudden

nal Water

es of the vision of

e central, f Mexico.

Page 10

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Dam Management in Mexico