Bill - here's a "crazy" theory that came to mind:
Would a calibrated cylindrical bucket, filled to a specified mark and then floated in a stabilized manner within the pond be a means of distinguishing evaporation from seepage?
After inserting a yard stick into the pond's bottom near the bucket (with the surface level marked on the yard stick), if the surface level on the yard stick drops by a greater degree than the original water level within the partially-filled (yet floating) bucket, the difference between the two fluctuations could be attributed to seepage while the drop within the bucket could be isolated strickly to evaporation. ???? (The reason for floating the bucket in the pond is so the water within it would replicate the pond water temperature.) Do you think this method has any merit? Kelly D

Kelly Duffie
Cypress, TX