in a rain water harvesting system the rain water from a roof of 22m *20m drains into a cylindrical tank having diameter of the base 2m and height 3.5m . if the tank is rainfall in cm .
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Rectangular roof : l=22m,b=20m
Cylindrical tank : r=1m,h=3.5m
The volume of tank =πr2h
=722×1×1×3.5
=722×1035
=11m3
Area of roof =l×b=22×20=440m2
Rainfall =Area of roofVolume of tank
∴ Rainfall =440m211m3=0.025m
∴ Rainfall is 2.5cm
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