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SR A -I -A on the Barrier Island) so that ponding does not last more than eight (8) hours. (13) Materials used in drainage facilities which cross, traverse, or encroach major roads as depicted on the Indian River County Thoroughfare Plan shall be concrete designed for a fifty (50) year life. (14) All stormwater facilities shall be established in dedicated water management tracts, easements or specified common areas. Condominium documents, deed restrictions, or other legally binding instruments shall describe the lo- cation of such areas, specifically define the the mechanism for preservation of and maintenance of any private drainage systems, and shall appoint an entity responsible for mainte- nance and preservation. All water management tracts shall include a maintenance berm, with a slope not steeper than 8 foot horizontal to 1 foot vertical. In addition such facilities, as well as open channels and ponds, shall have an easementfor access to and around the perimeter for maintenance. Retention or detention facilities above and below, the designed high water elevation shall be graded to slopes not steeper than �! 4 foot horizontal to 1 foot vertical. 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 introduction into any off-site receiving facilities. Pervious area on line shall be covered with grass or suit- able ground cover which has effective filtering characteris- tics. (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 9!Aap or ordinance shall be issued for any development project which is designed to discharge directly into, or through an outfall discharging