Solving Liner Uplift from Groundwater and Runoff in a Clay Courtyard Pond

Root Cause

Red clay holds water. Rain and gutter overflow saturate the soil behind the liner, creating hydrostatic pressure that lifts it.

Solutions

• Redirect gutter downspouts away from the pond.
• Install a perforated drain pipe (French drain) along the low side, under the liner, leading to a lower discharge point.
• Or, lay 12 inches of clean stone in the excavation, cover with heavy plastic, then the liner. Stone acts as a drainage buffer.
• Strip sod 6 inches deep around the pond, lay landscape fabric, replace sod. Slows water infiltration.

Verification

After heavy rain, check for uplift. Adjust as needed.