Gutter Flow Calculator

Calculate gutter flow capacity using Manning equation for U-shaped and L-shaped gutters — free hydraulic calculation tool

Standard Gutter Sizes

Gutter Parameters

Gutter Type

Width (mm)

Depth (mm)

Slope i (%)

Manning's n

Concrete: 0.013, PVC: 0.010

Cross Section

Calculation Results

Flow Area A

0.0900

m²

Hydraulic Radius R

0.1000

Velocity V

2.344

m/s

Flow Rate Q

0.2109

m³/s

(210.9 L/s)

Manning's Equation:

V = (1/n) · R^(2/3) · i^(1/2)

V = (1/0.013) · 0.1000^(2/3) · 0.0200^(1/2)

V = 2.344 m/s

Q = A · V = 0.0900 × 2.344 = 0.2109 m³/s