Question

water in a canal ,6m wideand 1.5m deep is following with a speed if 10km/h .how much area will it irrigate in 30min ,if 8cmif standing water is needed.

Answer 1

speed of water = 10km/h =10*1000/60 m/min
=500/3 m/min
amount of water flowing = 6*1.5*500/3=1500 cubicm/min

standing water needed =8cm=8/100m

Area will irrigate in 30min =
amount of water flowing/standing water needed
=1500*100/8*30
= 562500 sqm
=5.625 hectares