Cap Design Calculator

Design multi-layer engineered caps for contaminated sites per EPA/RCRA guidance.

Cap length (m)

Cap width (m)

Gas vent layer (1=yes, 0=no)

Barrier type (0=clay, 1=geomembrane+clay)

Local frost depth (m)

Cap surface slope (%)

Annual precipitation (mm)

Tab to move between fields

Cap area (m²)

5,000

Total cap thickness (m)

2.25

Total material volume (m³)

11,250

Gas vent layer (m³)1,500

Compacted clay (m³)3,000

Geomembrane area (m²)0

Drainage layer (m³)1,500

Protection layer (m³)4,500

Topsoil (m³)750

Drainage adequacy (%)100

How to Use This Calculator

Enter cap length and width in meters to define the capping footprint.
Select barrier type (compacted clay or geomembrane + clay) and specify local frost depth.
Enable the gas vent layer option if landfill gas migration is a concern.
Set cap surface slope (%) and annual precipitation to verify drainage adequacy.
Review total cap thickness, layer volumes (clay, drainage, topsoil), and drainage adequacy rating.

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