EXERCISE o A catchment area of 100 Sq. Km. in Gilgit received a rainfall of 12 cm from a 3-hours storm. At the outlet of the catchment, a natural stream had a steady flow of 10 cumecs before the storm and experienced a runoff lasting for 20 hours with an average discharge value of 90 cumecs. The stream was again to its original steady state with a flow of 10 cumecs. Estimate the losses and ratio of runoff to precipitation. (Elk Lake has a surface area of 500 ac. Over a 10-day period, the average inflow was 27,648 in3/s and the average outflow was 20,736 in3/s. The total precipitation was measured as 1.8 inches and the total evaporation loss was 1.1 inches. Over the 10-day period, a +2 inch storage change (or increase in lake level) was recorded. Estimate the amount of seepage (in inches) over the 10-day period for the lake. (Note: 1 ac = 43,560 ft2 = 6,272,640 in2).