Alake with a surface area of 525 acres was monitered over a period of time. during a 1 month period the inflow was 30 cfs, the outflow was 27 cfs, and a 1.5 in. seepage loss was measured. during the same month, the total percipitation was 4.25 in. evaporation loss was estimated as 6.0 in. estimate the storage change for this lake during the month.