An irrigation district is being formed to provide water to 5000 acres of cropland. the estimated average evapotranspiration (et) for the crop is 24" for the growing season. the average precipitation for the same period is 11". the soil has a water holding capacity of 0.1" of water per inch of soil. the root zone is three feet deep, and the soil moisture is maintained at half its water holding capacity. also, the soil profile is saturated to its field capacity at the beginning of the season, which corresponds to the bottom of the root zone (i. e., 3’ below the surface). assume that the irrigation system is properly managed (i. e., no surface runoff (q=0) or groundwater recharge (g = what is the volume of irrigation water required for a growing season?