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El Dry retention slopes and wet retention slopes above the design low water elevation shall be grassed or otherwise stabilized. Retention or detention ponds in high traffic areas shall be fenced. (15) In watershed areas where the County has adopted a Stormwater Management master plan, all proposed facilities shall be in conformance with the adopted plan. (16) Stormwater systems connected to local 298 Drainage Districts' facilities shall be designed with consideration given to the capacity of the District's overall system and shall be compatible with the objectives of each District. (17) Rainfall runoff from roads, parking lots, roofs, and other impervious surfaces shall be directed to areas where percolation into the soil can be accomplished prior to introduc- tion into any off-site receiving facilities. Pervious area on line shall be covered with grass or suitable ground cover which has effective filtering characteristics. (18) (a) The stormwater management system shall handle all stormwater that flows into, through and from the project without creating adverse impacts on other lands served by the stormwater management system or by the receiving waters relative to flooding, erosion hazards, or water quality and quantity. (b) No permit required by this ordinance shall be issued for any development project which is designed to discharge directly into, or through an outfall discharging into "Outstanding Florida Waters" designated by State Law, unless the system is designed in accordance with the following criteria, in addition to all those otherwise stated by this section: (1) Runoff from roads, parking lots, roofs, and other impervious surfaces shall be directed to grass swales prior to entering a detention system. (2) The system shall be designed in a manner complying with the requirements of Florida Administrative Code 17-4.242, as amended from time to time, and applicant shall provide DER documentation and proof of such compliance. (19) The applicant will demonstrate that the 'development project is not in a Flood Hazard Zone, Flood Hazard Zones are identified under the following procedure: (a) A Flood Hazard Zone shall encompass all lands subject to inundation by the regulatory 100 year flood, including lands in a Critical Flood Zone or Coastal High Hazard Zone. (b) A Critical Flood Zone shall encompass: (1) Lands subject to inundation by a ten (10) year flood, i.e., the flood that has a ten (100) percent probability of being equalled or exceeded in any given year. (2) Wetlands, watercourses and waterbodies. (3) Floodways (see (d) below).