2016-097 Ordinance - Laserfiche WebLink

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EXHIBIT A: EXISTING CHAPTER 928 928.08 STREETS UTILITIES AND PUBLIC SERVICES CODE 66R-12 (b) Water Quality Basins. (1) Pool geometry. The minimum length -to -width ratio for the pond is 3:1 (the length will be three (3) times the width). (2) Riser in embankment. The riser shall be located within the embankment for purposes of maintenance access. Access to the riser will be by manholes. (3) Water drains. Each retention basin shall have a drainpipe that can completely drain the pond. The drain shall have an elbow within the pond toprevent sediment deposition from plugging the drain. (4) Adjustable gate valves. Both the Water Quality and the Storm Water Management Basin drains shall have adjustable gate valves. Valves shall be located inside of the riser at a point where they will remain dry and can be operated in a safe and convenient manner. During the annual inspections the valves shall be fully opened and closed at least once, and the certifying official shall attest to this on the inspection form. To prevent vandalism, the handwheel shall be chained to a ringbolt or manhole step. (5) _Principal spillway. Each principal spillway shall be designed in accordance with the Natural Resources Conservation Service (MRCS) standards and specifications for the office serving the local county. Each principal spillway shall have the capacity to pass the 100 year -design storm flows. The inlet or riser size for the pipe drops shall be designed so that the flow through the structure goes from weir flow control to pipe flow control without going into orifice control in the riser. The crest elevation of the primary spillway shall be no less than one foot below the emergency spillway crest. Premium joint pipe is required and a removable trash rack shall be installed at each location. Anti -seep collars shall be provided for all pipe conduits through an embankment. (6) Emergency spillway. An emergency spillway shall be provided on each Water Quality and Storm Water Management basin. Emergency spillways shall convey flood flows safely past the embankment, and shall be designed in accordance with NRCS standards and specifications for the office serving the local county. Emergency spillways shall have a 100 -year design storm capacity unless exempted in writing by the City of North Olmsted Engineer. (7) Embankments. Each dam embankment shall be designed in accordance with the NRCS standards and specifications for the office serving the county that the project is located in. Anti -seep collars shall be provided for allpipe conduits through an embankment. (8) Safety features. A. The primary spillway opening shall not permit access to the public and other non -maintenance personnel. B. The perimeter of all water pool areas that are deeper than three (3) feet shall be surrounded by benches that meet the following: 1. A safety bench, with a maximum slope of 3%, which extends outward, on dry land, from the shoreline. This bench will be a minimum of 25 feet wide to provide for the safety of individuals and maintenance vehicles that are adjacent to the water pool. The safety bench may be landscaped, without the use of structures, to prevent access to the water pool.