The storage in a rectangular section irrigation channel is 20,000 m2 at a given time. Determine the storage 1 hour later if the average rates of inflow and outflow during the hour are 23 and 18 m3/s respectively. The evaporation rate from the surface of the 0.79 ha charnel reach is 26 hectare-m/day. 1 ha = 104m2 Storage change in m3 of the 1 hour (10 points) Depth change in mm of the 1 hr (5 points) Depth increasing or decreasing.