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[(1 WO Material specifications for culverts and storm sewers. The following pipe materials are acceptable: 1. Reinforced concrete pipe, fiber reinforced concrete pipe, bituminous coated corrugated steel pipe, aluminum pipe, aluminum pipe arch, bituminous -coated structural plate steel pipe, bituminous -coated steel pipe arch, and HDPE N-12. Other pipe materials may be used, if approved for the intended use by the Florida Department of Transportation. The minimum diameter of single-family residential driveway or stormwater management system discharge culverts shall be twelve (12) inches or its cross-sectional equivalent; (k) Temporary ponding is allowable in areas specifically designed with high percolation rates (such as east of SR A -1-A on the Barrier Island). The design shall be such se that ponding does not last more than eight (8) hours. Temporary ponding in parking lots is permissible, if of shallow depth. (I) Materials used in drainage facilities which cross, traverse, or encroach upon major roads as depicted on the Indian River county thoroughfare plan shall be of FDOT approved materials, acceptable to the Indian River Public Works director and designed for a minimum fifty-year life. (m)(1) All stormwater facilities shall be established in dedicated stormwater management tracts, easements, or specified common areas. The plat and any homeowners' association documents, property owners' association. documents, condominium documents, deed restrictions, or other legally binding instruments shall describe the location of such areas, specifically define the mechanism for preservation and maintenance of any private drainage systems, and shall appoint an entity responsible for perpetual maintenance and preservation. (2) All wet detention stormwater management tracts (not including swales) greater than 0.5 acres at control elevation, shall include a ma ntenance area free of obstructions except as .otherwise provided below. with The maintenance area shall have a slope not steeper than eight -foot horizontal to one -foot vertical (8:1)and shall be a minimum of fifteen (15) feet wide, completely around and outside the area submerged by the twenty-five year, twenty-four hour design stormwater elevation. If proposed lots or tracts are to be under separate ownership, then the maintenance area --shall be connected to fleeting with an ingress -egress or other appropriate easement, or public right-of-way, having a minimum width of fifteen (15) feet.10 _ In _ _ uels OD IMP VS IV 10 10 1 WI A VI owner's association is properly established. Open channels and swales in single-family residential developments shall be located within an easements that are with a minimum of fifteen (15) feet wide -feet-width for access and maintenance. 6