He may have a groundwater pond. Currently, my pond is down about 75" from full pool due to the low rainfall last year and this winter. Sandy soil and groundwater ponds don't go together! When I renovated my pond, we dug it 22' deep. Hurricane Ike came thru about 3 weeks later and washed about 4' of sand into the pond. With my water level down I still have 11' to 12' of water in the pond. If I hadn't renovated the pond, and didn't have an aerator, I'd be looking at a massive winterkill of fish this year.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).