Outfall Sewers

Among the aspects to be considered in the design of a sewer outlet are listed as under:

(a)        Location to avoid unpleasant sight and offensive smell.

(b)       Protection of the mouth of sewer if it empties into a river against swift currents, water traffic, floating debris, heavy waves, or other hazards which might damage the structure.

(c)        Prevention of backing-up of water into the sewer if the outlet is having a flat grade.

The ideal location for an outlet is onto a swiftly running stream with currents that will always carry away floating and settleable matter that has not been removed by treatment processes.