Q$2$:

A one$-$acre pond is to be excavated in sand where groundwater is deep. A $3$ foot

thick compacted clay liner will be installed so the pond will hold water. Laboratory

tests on reconstituted clay samples indicate an average permeability of ${10}^{-5}c\frac{m}{sec}$

will be achieved. Water will be pumped from a nearby stream to maintain the

average water level in the pond at $6$ feet. Estimate the water loss in gallons per hour

that will have to be made up$.$ Assume all water loss is due to seepage through the

liner.