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which convey water to natural points of drainage. Elevation - Height in feet expressed in relation to mean sea level and referenced to the National Geodetic Vertical Datum (NGVD). Filtration or to Filter - The selective removal of suspended matter from stormwater by passing the water through suitable fine textured granular media such as porous soil, sand and gravel or other natural or artificial aggregate, which may be used in conjunction with filter fabric or underdrain pipe or both. Flood or Flooding - A general and temporary condition of partial or complete inundation of normally dry land areas from: (1) The overflow of inland or tidal waters. (2) The unusual and rapid accumulation of runoff of surface waters from any source. 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 contains flood profiles, as well as the flood boundary-floodway 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 elevations above specified levels as determined in Section 7 A (20) (d). Floor - Any floor (including basement) usable 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, verses time for a selected outfall point. Impervious Surface - A surface which is highly resistant to infiltration by water. It includes surfaces such as compacted sand, limerock, or clay, as well as most conventionally surfaced -4- y: Vis.