Project - Building 1 acre lake 8-10 feet deep in existing stream bed fed by aquifer/springs. Normally light flow except during rains then it gets heavy.
Issue - Soil is sand w/trace of clay at depth of 12� with water table hit at 14� (water filled test hole to depth of 3�).
Question � Will an excavated lake depth of 10� be sealed by the water table below or will the hydrostatic head of the lake simply drive the water table down and the lake will drain into the sand? Interestingly, the existing stream bed holds water year round at a depth of about 1 � feet. Lots of silt and sand.
I suspect, it will drain and my reasonable option is to seal the bottom with lot of trucked in clay.
Feedback please.