House Sewers

House sewers should not be less than 150 mm in diameter; and should preferably have a minimum longitudinal slope of 1:60, laid to straight line and grade. Slopes of as little as equal to those of the street help minimize infiltration and root penetration. Connections to the main street sewer should not be made with Y or T branches. The use of T is preferred in sanitary sewers where simultaneous discharge of house sewers into the street sewer is not common.