Building and Developing

How do I calculate my sewage flow rate?

Sewage flow rate

The average foul flow rate for a domestic house is 0.046l/s. For commercial/industrial properties this will vary so will be calculated as part of the assessment we undertake.

We will calculate the surface water flow rate. On your application please indicate the total impermeable area (roof, paved, hardstanding area) in m2 that will be collecting rainwater and flow into the surface water sewer.