NAME
GW Engineering FINAL EXAM 2010
NOTE: Supplemental Materials pages 9'12
PROBLEM #1 -25 points USE UNITS of METERS and DAYS
Write vour answer on the followinq paqe. SHOW YOUR WORK
The hydrograph shown below is from a basin that is 5 kilometers by 5 kilometers' The specific
yield of the geologic materials average 0.0{3.
1a) What was the votume of recharge between the 2007 and the 2008 water years?
1b) lf all of that water was spread uniformly throughout the basin, how much would the
water level change?
To get full credit:
SHOW HOW YOU OBTAIN THE VALUES YOU USED ON THE GRAPH BELOW
,&'
I
lr
tE
s
r(atY'J,L^4 *T&\?oos
C-v
5Y-AA
3
6
L
IE 1000
J
Its
f
E
J
a
I
l,
€r'*
f\ |\
F. F
cr Er (f Crjo
ta
4,iiit
l\l\f\FF.F
ocrcrc)(](f
+4tirird=
* t,&
mmm
o(fo
4n$
E
Stmmmmmst(nsr
e'E|cr(fpc'c'clt:l
+{u\67d4d*
= \O ""a
Page
I of10
NAME
GW Engineering FINAL EXAM 2010
PROVIDE CALCULATIONS AND ANSWERS TO PROBLEM 1 HERE
USE UNITS of METERS and DAYS
SHOW YOUR WORK
1a) (20pts) What was the volume of recharge between the 2007 and the 2008 water years?
VKzoo]
*-
&u {oon
*i:* \?oo
L,altfi^{
i
too
?.3
VrPzoot-
V?-7ao-t
z
hJ
5
$ t bLlgoaas:
2,7) lo
?.'/,e
z LTlsoaos
:
t
z{"LEAe4estu^3
Oe{O{
tl73Q **3
2"3
7.
bg x tot n*'3
Remember To get full credit: SHOW HOW YOU OBTAIN THE VALUES YOU USED ON THE
GRAPH ON THE PREVIOUS PAGE
1b) (spts) tf all of that water was spread uniformly throughout the basin, how much would the
water level change?
\,Jn"\* Lcvu\ B.*o
'*
V"\
**-#:;
A."o SY
*t
.bgh l$/r*3
5om^ Sooc\,n d,D\3
NAME
GW Engineering FINAL EXAM 2010
PROVIDE CALCULATIONS AND ANSWERS TO PROBLEM 2 HERE
USE UNITS of METERS and DAYS
SHOW YOUR WORK
2a) (1Spts) What is the volumetric flow rate through the tube?
&=-k'f
l{=
8"'-
%5?.$Y
3,^, +
O,ool VA d.o3"-fcL
h= l,innX [-5*" = ?'zEn,#t's
-;
a-\zE
''
-\:
=
a
5nr=-
b' 3*
{
'.t
-rL-a,.
6
? 7,\x\a-4ts
2b) (10pts) What is the head difference across the light colored material in the middle of the
tube?
At,
Y-
c.L
a
al
t
KA
0;039 2,25r&
d\
= 0.a63 nr\
Page 4
of 10
NAME
GW Engineering FINAL EXAM 2010
PROBLEM #3
of METERS and DAYS
- 25 points USE UNITS
page.
SHOW YOUR WORK
Write vour answer on the followinq
The confined limestone shown in the diagram below is 10 meters thick, has a hydraulic
conductivity of 25 mld and a specific storage of 1x10-6 m{. The limestone abuts a crystalline
rock formation to the east with a hydraulicionductivity of 2.5x10-6 m/d. That contact continues
for a long distance to the north and south. The limestone is uniform and extensive for a large
distance in the other three directions.
1000 cubic meters of water per day is injected in the injection wetl for 7 days then the iniection
is stopped.
3a) What is the change in head from the pre-pumping condition at the observation well 1 day
after the injection stops?
-*-v
Qfr')
t,
t/
^-f*
.o' Non.ro zqP*
<'t"'
OBSERVATIOTTI
iERVATtOrrr
WELI
JE
r, b\K'
le:::')':
4,
}P\
IHJECTIOH
WELL iIffiM
t15Om
I r-- \'3o*t ?:
i'\ALz-qfI
StXlm
f 1o \3goJf'€'uD
Page 5
of 10
NAME
GW Engineering FINAL EXAM 2010
PROVIDE CALCULATIONS AND ANSWERS TO PROBLEM 3 HERE
USE UNITS of METERS and DAYS
SHOW YOUR WORK
3a) (25pts) What is the change in head from the pre-pumping condition at the obseruation well
1 day after the injection stops?
T* V b - t:lr;-/drA
$* $sb€ \
-*4'
in
ied.o^ 4*
tr$4\'ffcSrin"a
e
u=S = 0.00 q?V ,^JA") - J, b 68
D
4TI
t*re,\\
tala-
br.$.rar^.t
?r ,.tl't
of
trc,\l
\ &"*&
*iry
s=
#
--ra\'
u[*)
rr
b\
: o.oo38zf rr
1[,rr)sd
%
=5 J27'
=
{'11
- O,Dt ilVZf r\ - 7'b{
\
-6.
-A
LoP*?A
rr
z d.ool ge8
fu:
o
6)
w
-Tft6 rn
- I , $u "q
tgi
t0. 56
f6, s6
&
r- \. 5a
l. l.t b
.!e
-
va\
1,3 2 "r.
hF'
\^€r.A
ris€APage 6
of 10
NAME
GW Engineering FINAL EXAM 2010
PROVIDE CALCULATIONS AND ANSWERS TO PROBLEM 4 HERE
USE UNITS of METERS and DAYS
Also MILLIGRAMS and LITERS
iz
S"'ffit
s
) =+#^:' d.ooo3x
(23pts) What is the concentration at the well?
\ orn*,ln.,e,
u!^h S\ol*- tpr\L.
^%
o*,
.oo**.Jl^g
J"f)" |5)ers ffi
=r:r**,[|#$t'
"r*to#
@"sffi]
c=G eev{' l'\,2*" \
=
rb *,i |'-u,-,rrr) e"it(r','r') 'r$[o'o'?.{o)
l=-l5crt^
L
lr,or)
:
o'5r?
1,rsl)[o'u'')
a long period of time?
4b) (2pts) What do you think
answer if you properly explain how you
|ou will only
get credit for this
*'rr'.s''€r'(r,r[r*
} lba s'"'vh b*b-tT{k
{he- rna€S
rn& gb een{.',rry{lr*
n*at11 -\h{- s1s\erffi
D\er, *tr'e:*
S{.$cpart-S S dr: C a**tr firi e \h^X
rS
1a1ke.+.
w
6teaA"1
r\F. 'u
--'r -
JA
r€
-d;
L,.. b4€^^
\3iz^^*;lH
k"s
a
Page 8
of 10