Subsurface Drain Sizing

Size perimeter drains and subsurface drainage systems for foundation drainage.

Total foundation perimeter length.
feet
1=sandy, 2=loam, 3=clay.
Depth to seasonal high water table.
feet

Results

Drain Pipe Size-inches
Minimum Slope-in/ft
Gravel Bed Depth-inches
References: Based on IPC Section 1115 foundation drain requirements and soil permeability