Alake with a surface area of 1260 acres was monitored over a period of time. during a one-month period, the inflow was 36 cfs, the outflow was 30 cfs, and a 1.6-in seepage loss was measure. during the same month, the total precipitation was 4.3 in. evaporation loss was estimated as 6.0 in. estimate the storage change for this lake during the month