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 Problem Statement

The current expected rain water uniform depth on a flat roof is 97 mm for a total volume of 69.84 m^3
Find the new equivalent water depth if the roof is expected to deflect downwards with a slope of 10m to 250mm according to the following image.
https://imgur.com/a/eXHnyw6
 Relevant Equations
 V= Base * Width * Height
The expected shape of the deflected roof will look like a pyramid with a water height of 'h'.
I am having a hard time to find the a formula for the new shape.
Can some one provide me some guidance please, will I have to use calculus to find the volume for this particular shape?
I am having a hard time to find the a formula for the new shape.
Can some one provide me some guidance please, will I have to use calculus to find the volume for this particular shape?
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