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Unformatted text preview: Quiz 4
CE 361
October 18th, 2007
25 pts
Available Name: ‘
BE SURE TO INCLEEDE ALL UNITS IN YOUR CALULATIONS AND SHOW ALL WORKH Multiple Choice Questions {2 points each) 1. Prior to ponding time a soil’s infiltration rate during a rainfall event will: a. increase b. remain unchanged
0. decrease (1. equal the potential infiltration rate
2. The storage within a confined aquifer is usually an unconfined aquifer a. easier to measure then
b. less then c. greater than d. equal to 3. Which of the following could NOT be considered an equipotential line in a ﬂow net. a. An aquifuge b. Partially buried retaining wall
c. An observation well d. A and C 4. Under a unit decline in head, specific storage describes: a. Volume of water that an aquifer releases release per unit surface area 1). Rate that water can be pumped from a unconfined aquifer c. Volume of water that a unit volume of aquifer releases from storage
d. Volume of water stored per unit thickness of a confined aquifer 5. The value of K depends on: a. The porosity of the soil b. The connectivity of the soil’s void
0. The moisture content of the soil
(1. All the above 6. In the end of the summer months the only water being provided to a river is unconfined
groundwater providing a baseﬂow. During this time the river stage averages 4m in depth. 500m
away is an observatory well with a depth of 24m. The rivers surface is 21m above this same datum. The local soil is silty loam, with a K:0.650m/hr and a 1120.453. Assume the soil is
homogeneous and isotropic. a. What is the specific discharge of the groundwater into the river? (3 pts) A“: qurZAM : AL: 339m
V5 (3. (asuM/(nr (DJ163
3M a t m
mm m => 5m Wye What is the specific velocity? (1 pt) c. Do you think that treating the groundwater as a homogeneous and isotropic system is a
realistic assumption? What does isotropic and homogeneous mean? (2 pts) /
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suit pcoﬁdléea aw \nﬂkto‘ double, v; St?” 1 checkout 7. The general control volume equation (Reynolds transport theorem) is: dB
5” :1 jﬂpdv+ jﬂpVdA
dt CV CS dr a. Use the Reynolds Transport Theorem to produce a step by step derivation of the 3—D
transient flow equation for a saturated homogeneous anisotropic porous medium. Make sure to show all steps, assumptions, and substitutions. (3 pts) B?W\t>65 g: \ AB!” __ Tr  o camWm a m) SO: O=E€Sc («Mung fV'cXPs
cs WWISxmK JWA M \
EH: SUI (CAV 3 €55 23% kdtxéych) + (Vfﬂdxﬁdz) Fivm Lanna.“ "i Aﬂa—m‘) X
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:ng‘st—i'ﬁ—‘kgﬂy'i %*W VKLKx‘hg) BVQKYYY)*UE(k1c‘UY 8535*“ b. What would the 3D transient flow equation look like for a saturated homogeneous isorropic
porous medium? Make sure to describe what assumption has been made? (2 pts) Kl: a  SO¥‘\
m w W 2:. lb. “32/. .._—+"§=t'»'~3';7"\4‘ct K 8. What does the Dupuit Aproximation help derive, and what are its assumptions? (Zpts) m DMPMA Jr O‘KNOX . W¥lm ‘\ S O\ 83mm? 3“ ms M, use} +0 cmro Lao“ Bomb35mm How
sswnms (lot oncocxixwi aqul‘iws.” “.9: Mom mb «but at How \s \D‘oiov‘nom +9 M 3v o£~ Jae, magma
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msmkmc/ 9. Discuss what the major assumptions of the Green and Ampt method are. (3 pts) L SK“? "idMAK‘LBA chA— +er dlvkhl Sod ‘W‘oi kw Wk“)? 6'» deUO From SQ’t‘meA
Sod S99AM Noam 'cqu‘r q ubwL Hm. Proust“. ...
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 Winter '07
 REED,PATRICKMICHWALTERS,GEOFFREY
 Hydrogeology, Aquifer, Reynolds Transport Theorem, Specific storage, transient flow equation

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