Inlet Capacity Calculator

Compute inlet capacity (m³/s) from Sx, Gutter Grade and spread T.

Inputs
Enter the three parameters. Sx values between 0.02 and 0.8 are supported.
Inlet Capacity (Z3)
Exact match — only when Sx ∈ {0.02, 0.4, 0.6, 0.8}
0.0180 m³/s
Interpolated Capacity (AA3)
Linear interpolation across Sx tables
Capacity vs T (m)
One curve per Sx table at Gutter Grade = 0.04