There are 2 formulas that give roughly the gallons of a pond:

LXWXDX7.8 gallons (right or 7.5?)

Circle? Anyone have that info?

The way to more accurately figure is using salt. See Roark's salt
calculator at www.click2roark.com

And most accurate, a water meter. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us