(A) Size and slope of building sewers. The size and slope of the building sewer shall be subject to the approval of the Superintendent.
(1) Except as provided below, the diameter shall not be less than 6 inches. The slope of the 6-inch pipe shall not be less than 1 foot per 100 feet. For larger sizes of pipe, the minimum slopes shall be according to all state and local regulations. Four-inch diameter building sewer may be used, provided that:
(a) A 6 by 4 reducer is installed at the service connection;
(b) It is installed at a slope of not less than 1 foot per 100 feet; and
(c) It serves a single-family dwelling.
(2) Multiple-housing units, commercial, and industrial building sewers shall be not less than 6-inch diameter.
(3) The pipe which allows leachate, as defined in § 50.01 of this code, to be introduced into the sewage disposal plant of the city, shall not be less than 2 inches in diameter.
(1983 Code, § 21-48)
(B) Elevation of building sewers; alignment; lifters.
(1) Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor. No building sewer shall be laid parallel to any bearing wall if within 3 feet of any such wall, which might thereby be weakened. The depth shall be sufficient to afford protection from frost. The building sewer shall be laid at uniform grade and in straight alignment insofar as possible. Changes in direction or grade shall be allowed only when a proper manhole is constructed at the location of the change.
(2) In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by the drain shall be lifted by approved artificial means and discharged to the building sewer.
(1983 Code, § 21-49)
(Ord. 2273, passed 10-4-1979; Am. Ord. 3031, passed 6-5-2003) Penalty, see § 10.99