How much did you build up the banks? Is the water level stopping at the four feet below at the un disturbed clay?

I can loose 1" per day form our one acre pond easy in evaporation. High winds and aeration.

Our pond took three years to pack the banks that we built up five feet and we would see in august about a drop of four feet. Three years later we only have about an 18" drop. It takes time for the banks to pack in if just packed with a dozer when building the pond.

I know its hard to have patience but if you built up the banks with clay it will need time to settle in. We had four good springs in ours and have the same thing your describing.

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.