Resolutions-1997-021

9 – STORM SEWERS AND STORMWATER MANAGEMENT FACILITIES 9.01 APPROVALS, PERMITS, AS-BUILTS, AND MAINTENANCE BONDS A. Stormwater management plans and calculations shall be required of all subdivisions (resubdivisions, developments and related improvements). The City Engineer may waive this requirement, on a case-by-case basis, for smaller subdivisions. B. Plans and specifications for public storm sewer and stormwater management facilities must be certified by a professional engineer registered in the State of Iowa and utilized the NGVD of 1929. C. Plans and specifications for public facilities must be reviewed and approved by the City Engineer prior to construction. Calculations must be provided at the same time as other submittals. D. Other local, state and federal permits may be required, depending on the circumstances. It shall be the responsibility of the Engineer of Record to acquire all applicable permits. A copy of all permits shall be provided to the City Engineer before construction. E. The Engineer of Record is responsible to submit "Record of Construction" drawings to the City Engineer on reproducible velum or mylar and in digital AutoCAD format. F. A five-year maintenance bond covering defective materials and workmanship is required for all storm sewer and stormwater management facilities to be dedicated to the city. 9.02 PERMITTED FLOWS A. No sanitary sewers, sanitary sewer services or septic tanks shall be discharged into storm sewers. B. No flows from commercial car washes shall be discharged into storm sewers. C. Sump pump discharge of ground and surface water is permitted. D. Only ground water is permitted in sump pump discharge tiles less than 12 inches in diameter. No surface water or roof drains are permitted in these systems. 9.03 DESIGN FLOWS AND CAPACITY A. Storm sewer systems consist of pipe and overland flow routes to convey storm water. All storm sewer designs shall contain both components. B. Storm sewer pipes shall be designed to convey the five year return frequency flow except for pipe used to discharge water from stormwater management facilities (see 9.12).