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CBSE Class 10 Answered

A canal is 300 cm wide and 120 cm deep. The water in the canal is flowing with a speed of 20 km/h. How much area will it irrigate in 20 minutes if 8 cm of standing water is desired?
Asked by Topperlearning User | 20 Feb, 2014, 01:44: PM
answered-by-expert Expert Answer

Volume of water that flows in the canal in one hour

= width of the canal x depth of the canal x speed of the canal water

= 3 x 1.2 x 20 x 1000m3 = 72000 m3

In 20 minutes the volume of water in the canal

= 72000 x m3 = 24000 m3

Area irrigated in 20 minutes, if 8 cm, i.e., 0.08 m standing water is required

= m2 = 300000 m2 = 30 hectares

Answered by | 20 Feb, 2014, 03:44: PM

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