The small irrigation project you manage collects 2,000,000 m3 of water annually in a reservoir. Of this, 20% evaporates from the reservoir surface during the year. Of the remaining water, 25% is lost...

The small irrigation project you manage collects 2,000,000 m3 of water annually in a reservoir. Of this, 20% evaporates from the reservoir surface during the year. Of the remaining water, 25% is lost by evaporation and percolation into the soil during distribution via unlined canals before the water reaches the fields. The water is then applied by furrow irrigation, with averages 20% of the water applied percolating below the crop root zone, 20% running off into collection canals at the low end of the field, and 30% evaporating from the soil surface. By the time of crop harvest, ET has dried the soil to about the same water content it had before irrigation began. Average ET is 7 mm/day for a 180-day irrigation season and crop water-use efficiency averages 1.1 kg of dry matter/m3 water transpired. Show calculations (or make a spreadsheet) to estimate:

(a) the overall water-use efficiency of the project (kg output/m³
water allocated),

(b) the application water efficiency for the project,

(c) the field water efficiency for the project, and

(d) the number of hectares that can be irrigated in this project.