A canal is 300 cm wide and 120 m deep. The water in the canal is flowing at speed of 30 km/hour. How much area will it irrigate in 30 minutes if 80cm of standing water is desired?
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Answer:Volume of water flows in the canel in one hour = wide of the canel × depth of the canel × speed of the canel water
=3 × 1.2 × 20 × 1000m³= 72000m³
in 20 min the volume of the canel
= 72000 × 20/60m³= 24000m³
Area irrigated in 20 min , if 8 cm i.e., 0.08 m standing water is required
= 24000/0.08 m²
= 300000m²
30 hectares
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