In a groundwater basin of 12 square miles, there are two aquifers: an upper unco

Question

In a groundwater basin of 12 square miles, there are two aquifers: an upper unconfined aquifer 500 ft in initial saturated thickness and a lower confined aquifer with an available hydraulic head drop of 150 ft (before it becomes unconfined). Hydraulic tests have determined that the specific yield of the upper unit is 0.12 and the storativity of the lower unit is 4 In a groundwater basin of 12 square miles, there are two aquifers: an upper unconfined aquifer 500 ft in initial saturated thickness and a lower confined aquifer with an available hydraulic head drop of 150 ft (before it becomes unconfined). Hydraulic tests have determined that the specific yield of the upper unit is 0.12 and the storativity of the lower unit is 4

Explanation / Answer

Volume of the unconfined aquifer = 12 square miles * 500ft = 167270400000 cubic ft.

Specific yield = 0.12

Therefore volume of water recoverable from unconfined aquifer = 167270400000*0.12 = 20072448000 cu. ft.

available hydraulic head of water in confined aquifer = 150ft

Volume of water in confined = 12 square miles * 150ft = 4181760000 cu. ft.

storativity = 4*10^-4

Therefore volume of water recoverable from confined aquifer = 4181760000 * 4*10^-4 = 1672704

Thus, total volume of water recoverable from the basin = 20072448000 + 1672704 = 20074120704 cu. ft.

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