2003-086 Ordinance - Laserfiche WebLink

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Ordinance No. 2003-86 (2) The stone bed shall be located a minimum of twenty feet (20') from any building or ten feet (10') from any property line or sanitary sewer easement. (3) An approved filter fabric shall cover the top and sides of the stone bed. (4) The required volume of the stone bed shall be calculated using approved terms for coefficient of runoff, drainage area, storm intensity and time of concentration. The porosity ratio sha11 be 0.33 to figure net volume from the gross volume. (5) An observation well shall be required for inspection purposes. The location and diameter sha11 be approved by the Engineering Department. The observation well sha11 be as deep as the deepest part of the stone bed. Perforated pipe may be approved for use m an observation well. (6) The infiltration basin shall have a sump pump to discharge excess water to an approved storm sewer or ditch. (c) All storm water flow from the proposed development, including flows from upstream azeas passing through, and further including increased flow attributable to changes in time of concentration or changes in the former runoff factor (imperviousness), shall be conveyed to the proper storage facility end outlet for the entire tributary area via a natural channel or pipe/culvert either or both of which shall be improved so as to be of adequate capacity. (Ord. 94-100. Passed 8-16-94.)" Shall be amended, and, as amended, shall read in its entirety as follows: "927.07 STORMWATER STORAGE STANDARDS. Stormwater storage facilities shall be either underground storage facilities, dry or wet ponds or a combination thereof as approved by the City Engineer, the Planning Commission and City Council during the development review process set forth in Chapter 1126 of the City of North Olmsted Zoning Code. Wet ponds (ponds that are designed to retain stormwater to a certain depth) shall be enclosed by a fence in accordance with Chapter 1345 of the City of North Olmsted Codified Ordinances. (a) All materials and components used for the construction of a stormwater storage facility shall conform to the latest version of the UNIFORM STANDARDS FOR SEWERAGE IlViPROVEMENTS or other approved standa.rds and, where necessary, shall be designed to support a standard H-20 wheel load if the facility is located under a roadway, drive or parking area. Corrugated metal pipe shall have annular ends with matching bands, gasket joints, m diameter shall be reinforced with and watertight seams. All plate bulkheads over 24" • external braces and stiffeners. Coirugated metal pipe sha11 be galvanized or aluminized. Reinforced concrete pipe used for storage facilities shall have premium joints and shall have endwalls or bulkheads designed to resist anticipated loads. Access manholes with access steps shall be provided at each end of an underground storage facility and at intermediate points, if deemed necessary by the City Engineer. The invert elevation of the storage facility outlet and the restnctor pipe shall be aligned in such a manner to eliminate the creation of a sump within the storage facility. Pipe installation methods and bedding materials shall conform to those recommended in the IJNIFORM STANDARDS FOR SEWERAGE IlVIPROVEMENTS. (b) Infiltration basins, also known as stone beds, shall only be approved subject to the following standards: 17