Problem 1: A canal commands an irrigation area of 440 ha. The duty of water on the foeld during the peak period is 220 ha/cumec.
Determine the design discharge of the canal at the off take if the water loss in the canal is 30%.
Solution:
Discharge = (440/ 220) cumec
= 2 cumec
Design discharge after 30% water loss = (2/0.7)= 2.86 cumec
Answer: 2.86 cumec
Problem 2: A canal commands an irrigation area of 350 hectare. The peak field irrigation requirement is 9 mm/day. Determine the design discharge of the canal at the off take, water loss is 25%.
Solution:
Peak discharge value = (350 * 104 * 9 * 10-3) m3/day
= 31500 m3/day
Design Discharge = 31500/0.75 m3/day
= 42000 m3/day
Answer: 42000 m3/day
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