This technical note describes five methods of estimating sewage or washwater flows: on-site measurement, on-site estimating, water metering estimates, community water use data and survey estimating.
USAID (1982): Estimating Sewage or Washwater Flows. (= Water for the World Technical Note No. SAN.2.P.2. ). Washington: United States Agency for International Development URL [Accessed: 17.08.2010]