Trench Drain Calculator

Calculate flow rates and hydraulic properties using Manning's equation

Channel Properties

Channel Width (inches)

Channel Depth (inches)

Channel Slope (%)

Channel Material

Calculation Results

Flow Rate

Cubic Feet per Second (CFS)

0.00

Gallons per Minute (GPM)

0.00

Liters per Second (L/s)

0.00

Cubic Meters per Second (m³/s)

0.0000

Flow Characteristics

Velocity (m/s)

0.00

Froude Number

0.00

Flow Regime

subcritical

Learn more about flow regimes

About This Calculator

This calculator uses Manning's equation to determine flow rates and hydraulic properties for open channel flow in trench drains. The calculations take into account:

Channel geometry (width, depth)
Channel slope
Surface roughness (Manning's n)
Flow regime (subcritical, critical, or supercritical)

Results include flow rates in various units, flow velocity, and the Froude number which indicates the flow regime.