Problem $5$: Flownet for a proposed cut off wall construction work is shown below. The hydraulic conductivity of the soil is given as $0\mathrm{.}07\frac{f}{m}in.$

a$)$ The total length of the cut off wall is $1300$ ft $.$ The water level on downstream ground $($datum level$)$ is maintained at El $0\mathrm{.}00$ ft by running dewatering pumps. Find the number of pumps required per day if capacity of each pump is $250ga\frac{l}{m}in.$