1986-24 (2) - Laserfiche WebLink

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I Detention (or to Detain) - The collection and temporary storage of stormwater in such a manner as to provide for treatment through physical, chemical, or biological process- es with subsequent gradual release of the stormwater to the receiving waters, in which the capacity for the specified treated volume of stormwater is $4$ 1i//BfVqV:Va(1d restored within 90 72 hours following a storm event. On-line detention is temporary storage along the axis of the drain- age system, whereas "off-line" detention is temporary storage at a location away from the system's direct path. Development Project - Any intentional man -caused change or improvement to land which increases the amount of imper- vious cover or results in the change in elevation of any portion of the land or changes the existing stormwater system and flood management system. A development project shall include but shall not be limited to all projects which require site plan or subdivision approval under the County Code. Discharge - The outflow of water from a project site, drainage basin or other facility. Drainage System (Artificial) - Any canal, ditch, culvert, dike, storm sewer or other man-made facility which tends to control the surface flow of water. Drainage System Natural - Surface streams or marshes which convey water to natural points of drainage. Elevations - Heights in feet expressed in relation to mean sea level and referenced to the National Geodetic Vertical Datum (NGVD). Existing Development - Any development, improvement or impervious surface existing on a project site at the time of request for site plan approval. Filtration or to Filter - The selective removal of suspended matter from stormwater by passing the water through at least 2 feet of suitable fine -textured granular medium such as porous soil, uniformly graded 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.