Question 72

Water in a canal 3 m wide and 1.2 m deep,is flowing with the velocity of 10 km/h. how much area (in hectares) will it irrigate in half an hour, if 9 cm of standing water is needed?

Solution

Width of canal = 3 m and depth = 1.2 m and speed of water flow = 10 km/hr

=> 5000 m flows in half hour

Volume of water flow = $$3\times1.2\times5000=18000$$ $$m^3$$

Standing water depth = 9 cm = 0.09 m

=> Irrigated area = $$\frac{18000}{0.09}=200000$$ $$m^3$$

$$\therefore$$ Area (in hectares) it will irrigate = $$\frac{200000}{10000}=20$$ hectares

=> Ans - (A)

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