A. Sanitary Sewers: Sanitary sewers and sanitary sewer services shall be installed to serve all properties in the subdivision. Public sanitary sewers shall have a minimum internal diameter of eight inches (8"). Sanitary sewer services shall have a minimum internal diameter of four inches (4"). Sanitary sewers with internal diameter between eight inches (8") and twenty one inches (21"), and sanitary sewer services, shall be constructed of extra strength vitrified clay pipe in conformance with the specifications of the American Society for Testing Materials, Designation C-200. Sanitary sewers with internal diameter twenty four inches (24") and over shall be constructed of either reinforced concrete pipe conforming to the American Society for Testing Materials, Designation C-76, wall thickness B, or asbestos cement pipe conforming to the American Society for Testing Materials, Designation C-296. Joints for vitrified clay pipe sanitary sewers and sanitary sewer services shall be the compression type in conformance with the specifications of the American Society for Testing Materials, Designation C-425-60T. Joints for reinforced concrete sewers shall be rubber gaskets conforming to American Society for Testing Materials, Designation C-443. Joints for asbestos cement pipe shall consist of an asbestos cement sleeve, made from material similar to the pipe, and two (2) rubber ring gaskets, all designed and suitable for connecting the lengths of pipe together. Rubber gaskets shall be of uniform thickness throughout, smooth, free from pitting, blisters, air checks and other imperfections.
B. Storm Sewers: Storm sewers shall be constructed throughout the entire subdivision to carry off water from all inlets and catch basins and shall be connected to an adequate outfall. Intercepting storm water structures shall be provided at intervals not in excess of four hundred feet (400') as measured along the gutter line. The storm water drainage system shall be separate and independent of the sanitary sewer system. Storm sewers shall be constructed of nonreinforced or reinforced concrete pipe conforming to the American Society for Testing Materials, Designations C-14 and C-76, respectively, wall thickness B. Other materials of storm sewer construction may be used in special cases upon the approval of the City Council. Existing drain tiles shall be connected to storm sewers or shall be restored to operating condition. Joints for concrete storm sewer shall be designated above for concrete sanitary sewers, or they shall be cement mortar and jute.
Storm sewer capacities shall be determined with the use of the rational formula. The intensity (I factor) used shall be a return frequency of not less than five (5) years for lateral mains, and ten (10) years for trunk mains The runoff coefficient (C factor) shall be determined by the character of the land to be drained and shall conform to accepted standard engineering practices. Street grades and lot and block drainage shall be established so as to permit positive drainage. (Ord. 0-77-02, 2-7-1977)