
There are a few things to consider when building or digging a pond.
Examine you soil.
Course pores Sand alone is hard to hold water, you may have to add Benoite
or lime to seal and hold water when building a pond.
Clay holds water well in most cases,but is harder to dig. Make sure when
building the dam, to pack clay in and walk it in with dozer so clay will seal, and
not leak water later.
The first thing to check is will soil hold water at your pond's location?
Some sandy soils dig easy, but will leaks water out to the point that the pond
drys up every year, and the fish die.
The best location for a pond is where the most water shed (where water flows to
a low spot) occurs. One inch of rain on one acre equals 44,000 gallons of water,
so just a few acres of water shed can fill a pond in just one rain. Avoid putting
the pond on top of hill with no water shed.
Avoid putting the pond in an area where soil will not hold water well.
Deep ponds are the best, if you can build them this way. Deeper water shades
sun from pond bottom and algae grows low in low light,so the deeper the pond
the less algae you'll have. One other good suggestion, and also a free service, is
call your local county Ag extension agent. They offer there services free, and
some counties offer to pay a portion of your pond's digging, as long as the pond
construction is done to there specs.

Where to Build a Pond or
Lake?