For an unconfined aquifer with uniform rainfall recharge, the initial water table is 10 meters above the bottom confining layer. The rainfall recharge rate is 150 cm/year. The aquifer hydraulic conductivity is 20 m/day. An underground subway is planned to be 7 m above the confining layer. A pumping well is needed in order to lower the water table beneath the subway. If the pumping rate 500 m/day is designed, what is the maximum distance to the subway that the pumping well can be in order to fulfill the dewatering purpose? Land surface Original water table rerlng )reldor ol a ou Subway tunnel 10m abond ol te aidost 7m baba K 20 m/day (not to scale) wofl

Structural Analysis
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Problem 5 (10 points)
For an unconfined aquifer with uniform rainfall recharge, the initial water table is 10 meters above
the bottom confining layer. The rainfall recharge rate is 150 cm/year. The aquifer hydraulic
conductivity is 20 m/day. An underground subway is planned to be 7 m above the confining layer.
A pumping well is needed in order to lower the water table beneath the subway. If the pumping
rate 500 m'/day is designed, what is the maximum distance to the subway that the pumping well
can be in order to fulfill the dewatering purpose?
Land surface
tmt t t t t
Original water table
tertlog 1)eldor
ol a un
Subway tunnel
10m
त ]
abaond af d babaod
K= 20 m/day
tgnal ort
(not to scale)nooih
wbnootg
bubsn n woft
bilt
Transcribed Image Text:Problem 5 (10 points) For an unconfined aquifer with uniform rainfall recharge, the initial water table is 10 meters above the bottom confining layer. The rainfall recharge rate is 150 cm/year. The aquifer hydraulic conductivity is 20 m/day. An underground subway is planned to be 7 m above the confining layer. A pumping well is needed in order to lower the water table beneath the subway. If the pumping rate 500 m'/day is designed, what is the maximum distance to the subway that the pumping well can be in order to fulfill the dewatering purpose? Land surface tmt t t t t Original water table tertlog 1)eldor ol a un Subway tunnel 10m त ] abaond af d babaod K= 20 m/day tgnal ort (not to scale)nooih wbnootg bubsn n woft bilt
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