How would you determine quantity of sanitary sewage.

Generally, the rate of sanitary sewage should be equal to the quantity of water supplied but actually some additions due to private water supplies and infiltration of water and some subtractions due to leakages of water in the pipe lines and water consumption in drinking, cooking, sprinkling on roads, gardening of lawns and for various industrial purposes should be considered. Thus, the rate of sanitary sewage produced (in lpcd) may be assumed to be `70-90%` normally `80%` of the rate of  water supplied.

Average quantity of sanitary sewage (DWF) = 70 to 90 % of (population `**` rate of w/s) )

This average quantity of sanitary sewage cannot be used for design purpose because practically average sewage never flows in the sewers but varies from time to time. The design of sewers should be done for the maximum possible flow.

Maximum or peak quantity of sanitary sewage is equal to the peak factor times the average flow.

The peak factor of....

Generally, the rate of sanitary sewage should be equal to the quantity of water supplied but actually some additions due to private water supplies and infiltration of water and some subtractions due to leakages of water in the pipe lines and water consumption in drinking, cooking, sprinkling on roads, gardening of lawns and for various industrial purposes should be considered. Thus, the rate of sanitary sewage produced (in lpcd) may be assumed to be `70-90%` normally `80%` of the rate of  water supplied.

Average quantity of sanitary sewage (DWF) = 70 to 90 % of (population `**` rate of w/s) )

This average quantity of sanitary sewage cannot be used for design purpose because practically average sewage never flows in the sewers but varies from time to time. The design of sewers should be done for the maximum possible flow.

Maximum or peak quantity of sanitary sewage is equal to the peak factor times the average flow.

The peak factor of 2 to 4 is generally adopted in Nepal.

The minimum rate of sewage flow is generally taken as the one third of the average flow.