Free Sewage Flow Calculator
Estimate the wastewater flow rate from a community based on water consumption and a return factor.
Average Sewage Flow
1,600 m^3/day
Average Sewage Flow vs Average Water Demand
Sewage Flow Estimation
Wastewater flow is derived from water consumption, reduced by a return factor.
Formulas
Average sewage = Water demand x Return factor
Peak sewage = Average x Peak factor x (1 + Infiltration)
The return factor (0.7-0.9) accounts for water consumed (irrigation, evaporation) that does not reach the sewer. The peak factor accounts for diurnal variation, and infiltration accounts for groundwater entering through pipe joints.
Example Calculation
2000 m^3/day water demand, 0.8 return factor, 2.5 peak factor, 10% infiltration.
- 01Average sewage = 2000 x 0.8 = 1600 m^3/day
- 02Peak sewage = 1600 x 2.5 x 1.10 = 4400 m^3/day
- 03Peak flow rate = 4400 / 86.4 = 50.9 L/s
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