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(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 Districts' 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 introduction into any off-site receiving facilities. Pervious areas on line shall be covered with grass or suitable ground cover which has effective filtering characteristics. (18) 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. (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 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 (10%) percent probability of being equalled or exceeded in any given year. (2) Wetlands, watercourses and waterbodies. (3) Fioodways (see (d) below). (4) Isolated topographic depressions with a history of flooding or a high potential for flooding. (c) A Coastal High Hazard Zone shall encompass areas subject to high velocity waters caused by, but not limited to, hurricane wave wash. (d) A Floodway shall include the normal channel of a -14- ,