Larry wrote:

My pond is lower receptacle(pond) is 3'x3'xabout 16". Figuring out
the volume is easy but how does that translate into gallons?

That is 3'x3'x1.33' or 12 cubic feet.

There are 7.48 gallons per cubic foot so you have

12 x 7.48 or 90 gallons.

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