Wastewater Flow Rate Calculator - Vodaland Engineering Portal

Select a Channel Based on Wastewater Flow Rate (GPM)

Fetching design rainfall…

Calculation Name

Provide the total design flow for this line. You can adjust outlets/length/slope in the next step.

Total Flow (GPM)

I know my rainfall intensity

Enter a value you already have (in/hr).

Calculate from ZIP (pick my own duration + ARI)

We’ll look up the PFDS table using your ZIP, but you choose duration & frequency.

Calculate from ZIP (suggested by site type)

We’ll use site type to suggest duration & frequency; you can still edit later.

Enter the square footage for each surface type. You can also tweak the rainfall intensity if needed.

Rainfall Intensity (in/hr)

Asphalt/Concrete (sq. ft) Brick (sq. ft)

Roofs (sq. ft) Lawns - Sandy Soil (sq. ft)

Lawns - Heavy Soil (sq. ft)

We’ll use these to compute velocities and match channels.

Required Material Required Load Class

Line Length (ft) Longitudinal Slope Number of Outlets

“Note: *The hydraulic calculation is calculated based on the last trench drain in the system, taking into account the slope and full line capacity.

You must be logged in to save the calculation.