Water in a canal, 6 m wide and 1.5 m deep, is flowing with a speed of 10 km/h. How much area will it irrigate in 30 minutes, if 8 cm of standing water is needed?
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Solution
Depth = 1.5 m, width = 6 m, height of standing water = 0.08 m
In 30 minutes, length of water column = 5 km = 5000 m
Volume of water in 30 minutes =1.5×6×5000=45000m3 Area=VolumeHeight =450000.08=562500m2