A canal and a river run parallel for five miles and are separated by an avergae of $200$ft of dry ground. The water surface elevation in the river and canal are $656\mathrm{.}0$ and $633\mathrm{.}4$ ft$,$ respectively. A stratum of sand intersects the sides of both tyhe canal and the river below the water level. This canal extends from elevation $620\mathrm{.}5$ to $625\mathrm{.}0$ ft and has a coefficent of permability of $6\mathrm{.}5$x$10^-7$ cm$/$sec$.$ The soils above and below the sand are stiff clay, which are essentially impermeable in comparison to sand