R0b,

Most people fill a pond with surface water (rain running off the surface of the land) or groundwater (the pond is built below the top of the local groundwater aquifer). A water well is typically used as a supplemental water supply.

One acre of land covered with water a foot deep is 326,000 gallons of water. If your pond is 3 acres, with an average depth of 10', then the amount of water in your pond will be almost 10 million gallons.

326,000 gals/acre-ft x 3 acres x 10 feet = 9,780,000 gallons

For a well that pumps 20 GPM, it will take 340 days of pumping 24/7 just to fill your pond! I highly recommend creating your pond design to gather as much rainwater as you can!

Welcome to Pond Boss, and good luck on your new pond project!