Question

with furmulas

Apple Water Resources Engineering 525 Problem 10.3: The annual consumptive use for cotton is 0.8 m/year. The monthly distribution of consumptive use and monthly effective precipitation during growing season are given below. The farm and conveyance losses are 30% and 25%, respectively. Determine: a) the monthly TDR values for cotton in mm/month and m /month/ha. b) the area which can be irrigated, if the total available water during irrigation season is 10 m for 100% regulation, and the irrigation modulus. Month Peff (cm) % of annual consumptive use 10 408 TO-149 18- 15 20 KE April May June July August -US 30 25 2016 MAY 545 Its/ha 96 Ang 1Ms re- D / Answers: a) 76.2. 171.4, 266.7.419.342./mm/month), 762, 1714, 2667, 4190, 3429 (mº/month/ha), b) 784 ha c) 1.56 lt/s/ha our may halay The

Answer 1

Annual consumptive use = 0.8m/year farm efficiency = e_f (100 - 30)% = 70% = 0.7 Conveyance efficiency e_c = (100 - 25)% = 75% = 0.75 over all efficiency e = 0.7 times 0.75 = 0.525 water supplied during season = 10^7 m^3 Total water resd during season = 7.63 + 1214 + 2667 + 4190 + 3429 - 12762 m^3/h9 Area trignted = 10^7/2762 = 783.57 ha 784 ha