Tunnel Waterproofing Calculator
Membrane area and injection quantities for tunnel systems.
Inputs
Results
Membrane area (sq ft)
36,128
Hydrostatic pressure (PSI)13
Material quantity (rolls/gal)85
Waterstop (linear ft)1,257
Estimated inflow (GPM)7.65
Material cost ($)$67,858
Cross-section area (sq ft)314.2
How to Use This Calculator
- Enter Tunnel Length (ft) and Tunnel Diameter/Width (ft) — the interior dimensions of the tunnel.
- Select Cross-Section Shape (1=circular, 2=horseshoe, 3=rectangular) to apply the correct perimeter calculation.
- Choose Waterproofing System (1=PVC sheet membrane, 2=spray-applied, 3=injection grouting for repairs).
- Enter Groundwater Head (ft) — the height of water above the tunnel crown driving hydrostatic pressure.
- Input Number of Construction Joints requiring waterstop treatment.
- Review Membrane Area (sq ft), Hydrostatic Pressure (PSI), Waterstop (linear ft), and Estimated Material Cost for design and procurement.
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