Question

Water in a canal, 30 dm wide and 12m deep, is flowing with a velocity of 20 km / hr. How much area will it irrigate in 30 min, if 9cm of standing water is desired?

Answer 1

Hi there!

Given,

Width of the canal = 30 dm = 300 cm

Depth of canal = 12 dm = 120 cm

Rate of flow of water = 20 km/hr

Distance covered by the water that will flow in 30 minutes = 20 × 30/60
= 10 km = 1000000 cm

Amount of water irrigated in 30 minutes =300 × 120 × 1000000
= 36000000000 cm³

Area irrigated if 9 cm standing water is desired = (36000000000/9)
= 4000000000 cm²

4000000000/1000000 km²

0.4 km²

Cheers!