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HYDROGEOLOGY TERMPROJECT :

DEWATERINGGROUP MEMBERS :

ANITA ANDRIANI 135060400111029HERDI PRADANA 135060401111017DEVI PUSPITA 135060401111040ELIRA DYAH S 135060407111003WIRDA 13506040711100!

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◦ In this project to design a dewatering system for an excaation

for the depth of the excaation is to go !e"ow the water ta!which is at $ meters from the gro%nd s%rface

&ater ta!"e sho%"d !e "owered !efore the excaation and 'esafe depth %nti" the end of the process

&hat theP%rpose(

)his design project is to p%rpose a"ternatie systems to worthe dewatering re*%irements# prepared %sing the &e""+ sof

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)he p%rpose of the dewatering is to proide a dryenironment for the constr%ction wor' 

Introd%ction of we""s to the constr%ction area is o

the easiest so"%tions for this p%rpose

Since dewatering needs to !e comp"eted as *%ic'possi!"e# p%mping we""s are to !e %sed in the sys

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◦&e""point system is one of the proposed ways to %ti"i,e indewatering !%t this method is not to !e %sed in o%r case-

BE./USE#

0- the grain si,e of the a*%ifer

$- the drawdown doesn1t %s%a""y exceed 2-2m

)3ERE4ORE#

the dewatering m%st !e cond%cted with the he"p of deeper owe""s and pro!a!"y "arger diameter we""s-

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/ deep we"" system %ses !ored we""s# typica""y p%m!y s%!mersi!"e p%mps

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◦)here are three important parameters to !e considered wh

&hat a!o%t the asss%mptions(

the !asic ass%mption is that the constr%ction cost of an addwe"" is greater than that of maintaining "arger discharges fo"onger time-

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4ig%re 0- .ross section of the excaation"

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 T#$ %$&$'() *$++,&% -. +#$ $/((+,-& *,+$ ,* '-,$ ,& +#$ ,%'$

O+#$' +#(& +#$ ,$&*,-&* -. $/((+,-& ,+ ,* &-8& +#(+ +#$ 8(+$

$+# ,* 2 $+$'* ,& (& &-&&$ (;,.$' 15"5 $+$'* +#,

 T#$ #

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4ig%re $- /eria" iew of the excaation with

coordinates-

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◦)he initia" try with two we""s

◦the "ong term case was a"so chec'ed for the same dischargewhich then fo%nd to !e reaching the !ottom of the a*%ifer isoon as seen days-

)ime 5d6 7ischarge 5m89d6 Max- 7rawdown

5m6

$ 2000 12"21

2 2000 15"32

2000 15"50

)a!"e 0-$ ; &e"" test Res%"t

◦)his a"ternatie reached the minim%m drawdown in $ days wp%mping rate of $

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4ig%re 8- $-&e"" .on=g%ration-

>00?

>050?

>2550?

>250?

1 2

>21"2525?

>3"525?

4ig%re >-$ ; 7ay 7rowdown co%nto%r m

prepared in &e"",

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◦/ three?we"" system was tested-

• )his system had to wor' for $ days with discharges 08 1150A 110000 !50

)a!"e $-8 ; &e"" test Res%"t

)he Rest Res%"t

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4ig%re >- $-&e"" .on=g%ration-4ig%re A-$ ; 7ay 7rowdown co%nto%r m

prepared in &e"",

>00?

>050? >2550?

>250?

1 3

2>12"542"25?

>3"520? >21"2520?

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◦)he fo%r?we"" system reached the goa" in $ days with a discharge

and 'ept p%mping steadi"y-

)a!"e 8-> ; &e"" test Res%"t

)ime 5d6 7ischarge 5m89d6

$?8 900

> !50

A 750

)he Rest Res%"t

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4ig%re >- $-&e"" .on=g%ration-4ig%re A-$ ; 7ay 7rowdown co%nto%r m

prepared in &e"",

>00?

>050?

>2550?

>250?

3

2

1

4

>12"57"75?

>21"2525?

>3"525?

>12"542"25?

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)he fo""owing )a!"e 2 shows the n%m!er of we""s and p%mping d%ration witcorresponding discharge a"%es tested a"ong the design process

C%m!er of &e""s 7ischarge 5m89d6 )ime 5d6

$ 2000 2@5@7

8 1300 2

1150 4

!50 11

> 900 2

!50 4

750 6

)a!"e 2- Parameters compared according to the test res%"ts-

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◦ T8- 8$))* )-(+$ $,+#$' *,$ -. +#$ $/((+,-& ('$( -)&+ (&+#$ '$;,'$ '(8-8& .-' (&

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◦H(,&% (&-+#$' 8$)) ,* &-+ -&*,$'$ +- $ .$(*,)$ (* ('+ -. +#$ (**+,-&*

+#$ &() $,*,-& #(* +- $ +#$ +#'$$@8$)) *

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&e"" Properties◦A& -+, $*,%& .-' +#,* *+< '$;,'$* +#$ )$(*+ &$' -. 8$))* +- (,&+(,&

I& +#,* (*$ +#$ *

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&e"" Properties◦ I& +#$ +()$ ,($+$' $$&* -& +#$ ,*#('%$" T#$ 8$))

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.onc"%sion

◦ T#$ '-$+ 8(* +- $*,%& ( .$8 ()+$'&(+,$* .-' $8(+$',&% -. (& $/(

◦ T#$ 8(+$' +()$ #( +- $ )-8$'$ $)-8 +#$ $/((+,-& (* ;-**,)$ (& (,&+(,&$ (+ ( *(.$ $)$(+,-& &+,) +#$ $& -. +#$ $/

◦A**,&% +#(+ +#$ -+, $*,%& *#-) -&*,$' +#$$$)-$&+ (& ,&% -*+* (& +#(+ $$,&% +#$ '-$*)-&%$' '(+#$' +#(& (,&% (&-+#$' 8$)) +- +#$ *