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2012-036
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2012-036
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Last modified
2/18/2025 3:21:41 PM
Creation date
10/5/2015 9:16:01 AM
Metadata
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Ordinances
Ordinance Number
2012-036
Adopted Date
11/06/2012
Agenda Item Number
10.A.1.
Ordinance Type
Land Development Regulations
State Filed Date
11\14\2012
Entity Name
Stormwater Management and Flood Protection
Code Number
Chapter 930 and Chapter 401 Amendmnts
Subject
Flood Maps New Flood Regulations
Codified or Exempt
Codified
Supplemental fields
SmeadsoftID
11548
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ORDINANCE 2012-036 <br />(e) Discharges from the development project shall be conveyed to a point of legal <br />positive outfall. Tailwater stages of receiving waters must be taken into account in <br />design, and off-site conveyance improvements or enlargement of existing <br />downstream facilities may be required. <br />(f) A dry detention area shall have an outlet device, and the elevation of that device <br />shall not be lower than the elevation of the off-site receiving channel or water <br />body unless protected by a suitably designed flap gate. If the project site is-leeated <br />has direct outfall i -s to an agency system, the use <br />of a flap gate must be approved by that agency. The bottom elevation of a dry <br />detention or retention system or area used for storage, must be a minimum of one <br />(1) foot above the established wet season water table. <br />(g) Where permitted, open drainage -ways shall retain natural design characteristics <br />and be so designed and protected that they do not present a hazard to life or <br />property. The design shall include measures to protect against scour and erosion <br />and provide for stable side slopes. Whenever possible, such waterways shall <br />provide for adequate flushing action by prevailing winds and currents to ensure <br />the prevention of stagnant water and debris accumulation. <br />(h) Disposition of stormwater runoff. The stormwater management system for <br />developments located predominantly on excessively drained soils shall maximize <br />stormwater infiltration. This shall be accomplished through the use of bottomless <br />inlets, perforated pipes, under drains, grading to retard runoff, natural or artificial <br />retention or detention basins, or other methods, depending on the characteristics <br />of the land area. Specific guidelines are as follows: <br />1. Areas and lots shall be developed to maximize the amount of rainfall <br />which is percolated into the soil and to minimize direct overland runoff <br />into adjoining streets and water courses. Stormwater runoff from roofs and <br />other impervious surfaces shall be diverted into swales, or terraces on the <br />lot. <br />2. Street drainage shall be by grassed swales, where allowed, or curb and <br />gutter in accordance with county specifications. All curb and gutter <br />systems shall discharge or direct water into a central stormwater tract or <br />across a grassed swale area or other filtering medium. <br />3. Whenever practical, as indicated by soil characteristics, water table <br />elevation, and topography, the overflow from any swale used shall be <br />diverted to percolation areas, ponding areas or natural or artificial seepage <br />basins of sufficient capacity to retain and provide for the maximum <br />infiltration of stormwater runoff from each drainage area for the design <br />Underline: Additions to Ordinance <br />Strike thr-eugh_- Deleted Text from Existing Ordinance <br />18 <br />C:\Documents and Settings\tlister\Desktop\Revised IRC Flood Protect Ord final 10-26-12.rtf <br />
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