narrowfarm welcome to pond boss, has this problem started recently or has is leaked ever since being dug?
With that size pond it sounds like you are loosing about 5 gallons a minute. You mentioned springs, is that the main source of your water or is it ground runoff from rain?

Let us know what kind of preparation work was done to make the pond, such as adding clay or Bentonite.
Possible fixes would be to drain the pond and search for the cause of the water loss, or increase your water input from a well or a stream if nearby, or put a liner in your pond.
My pond is a dammed up gully with very porous soil, it looses about 10 GPM, but I have a stream nearby so that the 110gpm piped in makes it possible.

Last edited by adirondack pond; 08/17/11 09:12 PM.