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Question

# Water in a river 6m wide and 1.5m deep flows with a speed of 10km/hr. How much area will it irrigate in half an hour if 8cm of standing water is needed? Use 10,000m2=1Hectare

A

52.45 Hectares

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B

49.25 Hectares

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C

56.25 Hectares

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D

66.76 Hectares

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Solution

## The correct option is C 56.25 Hectares Volume of water coming out of 6m wide and 1.5m deep canal in 1 hour at a speed of 10,000m/hr = 6 × 1.5 × 10,000 = 90,000m3 Hence the volume of water coming out in half an hour is = 90,000 × 1/2 = 45,000 m3 Let the irrigated area be a m2 Standing height of water = 0.08 × a = 45000 a = 562500 m2 1 Hectare = 10,000 m2 So, a = 56250010000 = 56.25 hectare

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