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0 flooring above the horizontal joists, beam or other support- ing member would constitute the lowest floor. Maintain or Maintenance - To keep in an acceptable state of performance and repair and, when referring to the height of grasses in a stormwater management tract or facility, it means to keep at a height of twelve (12") inches or less above the ground. Mangrove Stand - An assemblage of one or more of the following species: Black Mangrove (Avicennia nitida); Red Mangrove (Rhizophora mangle); White Mangrove (Laguncularia racemosa), and Buttonwood (Conocarpus erecta). Master Stormwater Management Plan or Master Plan - An engineering plan, written report, or engineering drawings outlining the primary and secondary drainage and stormwater treatment facilities needed for the proper development of a specific increment of the unincorporated area of Indian River County, Mobile Home - A structure, transportable in one or more sections, which is built on a permanent chassis and designed to be used with or without a permanent foundation when connected to the required utilities. It does not include recreational vehicles or travel trailers. National Geodetic Vertical Datum(NGVD) - As corrected in 1929, a vertical control used as a reference for establishing varying elevations within the floodplain. Person - Any individual, corporation, partnership, limited partnership, trust, or other organization or busi- ness entity. Regulatory Flood - The one hundred year flood, i.e., the flood that has one percent probability of being equalled or exceeded in any given year, as indicated on the official County flood hazard map. Retention or To Retain - The prevention of, or to prevent the discharge of a given volume of stormwater runoff into surface waters of the state by complete on-site storage where the capacity to store.the given volume of stormwater is 44$ restored within 0¢ 72 hours following the storm event. The required storage volume must be provided by a decrease of stored water caused by percolation through soil, evaporation, evapotranspiration, or spray irrigation. Retention shall be "off line" (i.e. outside of the primary drainage path), unless it is demonstrated by the applicant that water quality in the receiving waters will not be adversely impacted by "on-line" retention. Wet retention refers to an area the lowest elevation of which penetrates the dry season groundwater table. Dry retention refers to an area the lowest elevation of which lies at least two (21) feet above the wet season groundwater table.