🕳️ Manhole Design Calculator
Design according to ACI 318/350.
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Circular Manhole
Rectangular Manhole
Internal Diameter (Di) [m]
Depth to Base (H) [m]
Wall Thickness (tw) [m]
Top Slab Thick (tt) [m]
Bot Slab Thick (tb) [m]
Concrete cover (cc) [m]
Water Table Depth (GWT) [m]
Dry Soil Density (γ_dry) [kN/m³]
Sat. Soil Density (γ_sat) [kN/m³]
Earth Press. Coeff (Ko)
Surcharge / Live Load [kN/m²]
Concrete f'c [MPa]
Steel fy [MPa]
Max Crack Width [mm]
Analyze & Design Circular Manhole
Internal Length (L) [m]
Internal Width (B) [m]
Depth to Base (H) [m]
Wall Thickness (tw) [m]
Top Slab Thick (tt) [m]
Bot Slab Thick (tb) [m]
Concrete cover (cc) [m]
Water Table Depth (GWT) [m]
Dry Soil Density (γ_dry) [kN/m³]
Sat. Soil Density (γ_sat) [kN/m³]
Earth Press. Coeff (Ko)
Surcharge / Live Load [kN/m²]
Concrete f'c [MPa]
Steel fy [MPa]
Max Crack Width [mm]
Analyze & Design Rectangular Manhole
Figure 1: Geometry
RC Man Hole Dimensions
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