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is Flood Insurance Rate Map (FIRM) - An official map of a community, on which the Federal Emergency Management Agency has delineated both the areas of special flood hazard and the risk premium zones applicable to the community. Flood Insurance Study - The official report provided by the Federal Emergency Management Agency. The report con- tains flood profiles, as well as the flood boundary-floodway map and the water surface elevations map and the water surface elevation of the base flood. Floodway - The normal channel of a watercourse and the adjacent land areas that must remain unobstructed to convey the regulatory flood discharge without raising flood ele- vations above specified levels as determined in Section 7 A X OY (19) (d). Floor - Any floor (including basement) useable for living purposes which include working, sleeping, eating, cooking, or recreation, or a combination thereof. Hydrograph - A graph of discharge, or, for the purposes of this ordinance, volume.of stormwater, versus time for a selected outfall point. Impervious Surface - A surface which is highly resis- tant to infiltration by water. It includes surfaces such as compacted sand, limerock, or clay, as well as most conven- tionally surfaced streets, roofs, sidewalks, parking lots and other similar structures. Water surfaces such as lakes shall be considered impervious for runoff calculations. Legal Positive Outfall - The availability of a permanent and legally established water course or similar facility or means which has the hydraulic capability of conveying the stormwater discharge from a development project to receiving waters downstream. "Legally estab- lished water course" refers to a water course which is established by an expressed easement, plat dedication, or other documentation, or�implied easement or servitude as may be demonstrated to exist in accordance with Florida Law. Lot - A lawful building site. Such building site may consist of all, portions or combinations of land parcels described by metes and bounds, quarter section descriptions, lots shown on a subdivision plat, or any other legally described building site. Lowest Floor - The top surface of the lowest area within the inside perimeter of the exterior walls of a building. For slab -on -grade type buildings or buildings with basements the top surface of the slab or basement floor would constitute the lowest floor. For footing, foundation walls, or pile type buildings with crawl spaces under the building without basements, the top surface of the finished