Previous Topic

Next Topic

Book Contents

Book Index Average Dry Weather Flow (ADWF)

The Average Dry Weather Flow (ADWF) is calculated using the following equation:

ADWF (L/day) = EPdesign (people) x 225 (L/person/day).Eq. 6.6.16


  • EPdesign = Equivalent Population for Design Purposes as described in 6.6.5
  • 225 (L/person/day) = the average per capita residential wastewater generation

The 225 L / person / day is based on historical water consumption and wastewater flow measurement data across the city. Subsequent reviews of this rate of wastewater production have reaffirmed 225 L / person / day is the average rate of wastewater production per capita across North Shore City.