Math CentralQuandaries & Queries


Question from Kelly:

I have a pond that measures 335 feet wide, 385 feet long and 18 feet deep with a 4:1 slope on all four side. How do I figure out how many gallons of water this pond will hold?

Hi Kelly,

I drew a cross section of the length of your pool (not to scale).


$18 \times 4 = 72$ and hence the length of the bottom is $385 - 2\times 72 = 241$ feet. Likewise you can find the width of the bottom and then use the volume calculator at

to calculate the volume.

Write back if you need additional help with this,

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