show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long

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In one fortnight of a given month, there was a rainfall of 10 cm in a river valley. If the area of the valley is 7280 km^2 , show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long, 75 m wide and 3 m deep.
06
Oct
In one fortnight of a given month, there was a rainfall of 10 cm in a river valley. If the area of the valley is 7280 km^2 , show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long, 75 m wide and 3 [...]
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Tags: 75 m wide and 3 m deep. , In one fortnight of a given month , show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long , there was a rainfall of 10 cm in a river valley. If the area of the valley is 7280 km^2 ,