2. An unlined irrigation canal is aligned parallel to a river as shown in figure. This cross-section continues for 4.25 miles. The soils are generally clays, but a 6-inch-thick sand

seam is present as shown. The sand has k = 3 ×103 ft/s. Compute the water loss from the canal to the river due to seepage through this sand layer and express your answer in acre-ft per month. Note: One acre – foot is the amount of water that would cover one acre of ground to adepth of one foot. It is equal to 43560 fť.