SOLUTION: The rain that falls on a house roof 11m x 6.75m is channeled into a cistern that is 2.5m in diameter. How much rainfall on the roof would it take to fill the cistern to a depth of
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Question 553649: The rain that falls on a house roof 11m x 6.75m is channeled into a cistern that is 2.5m in diameter. How much rainfall on the roof would it take to fill the cistern to a depth of 2m? I can calculate the amount water in the cistern but can't figure out the amount of rainfall needed on the roof. Thank you
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
You need to find the volume of water in the cylindical cistern which have done already.
This should come to:
or
Substitute: D = 2.5, h = 2.
Use as an approximation.
To find the volume of rain falling on the roof (presumably a flat roof), mulltiply the area by the depth of the accummulated rain water (d).
Substitute V = 9.8125 from step 1.
Divide both sides by 745.25
inches of rain.
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