Resolutions-1997-021

9.05 SUBSURFACE DRAINAGE A. In predominantly wet areas, areas containing hydric soils and other such areas designated by the City Engineer, a subsurface drainage system shall be provided to receive the discharge from sump pumps. B. A 2-inch service connection manufactured specifically for the pipe being used and approved by the City Engineer shall be provided for each lot abutting the subsurface drainage system. C. The end of all sump pump services shall be marked with a metal post #4 reinforcing steel at least 24 inches in length buried to within one foot of the finished grade. 9.06 INTAKES AND DRAINAGE OF STREETS A. All intakes on public streets will be designed to the IDOT Type RA standards. B. DOT RA-63 intakes are allowed on storm sewer laterals. C. Intakes shall be spaced so that for a five (5) year storm arterial streets shall have two traffic lanes free of excess water at all times. Local and collector streets shall be designed to have one twelve (12) foot traffic lane free of water. Storm water shall not cross an intersection but can follow a curb around its radius. D. For a one hundred (100) year storm, the ponding of surface water on local, collector, and arterial streets must not exceed a depth of one (1) foot at the gutter. Water exceeding one (1) foot shall be designed to overflow into an overland flow route. This applies to temporary ponding from local drainage only. E. Streets in flood plains designated on the FEMA Flood Insurance Maps shall be elevated at their lowest point to the 100-year flood elevation. F. Minimum drop through intake structures shall be the same as required for manholes (see 9.08 B). 9.07 PIPE STANDARDS AND STRENGTH DESIGN A. Reinforced concrete pipe meeting the following standards may be used for pipe 12 inches in diameter or larger. 1. Joints a. Circular pipe: All joints will be confined O-ring gasket meeting ASTM C443. All pipe 36-inch diameter and smaller will have bell and spigot joints. Pipe larger than 36-inch diameter may have tongue and groove joints. If the hydraulic grade line is less than 6 inches above the top of the pipe during the 100-year event, O-ring gaskets may be omitted, provided each joint is wrapped with 24 inches of approved filter fabric.