Q. 44.2( 84 Votes )

Answer :

Area of the valley = 7280 km^{2}

If there was a rainfall of 10 cm in the valley then amount of rainfall in the valley = area of the valley × 10 cm

Amount of rainfall in the valley = 7280 km^{2}× 10 cm

Amount of rainfall in one day

= 0.728 km^{3 }------ [i]

Length of each river, *l* = 1072 km

The breadth of each river, *b* = 75 m

Depth of each river, *h* = 3 m

The volume of each river = *l* × *b* × *h*

= 0.2412 km

Volume of three such rivers = 3 × Volume of each river

= 3 × 0.2412 km^{3}^{}= 0.7236 km^{3} ------ [ii]

[i] and [ii] are approximately equal.

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