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Development Footprint: The new or redeveloped area covered by buildings or other roof <br />structures and other impervious surface areas, such as roads, parking lots, and sidewalks. <br />Discharge Point: The ultimate destination for the stormwater runoff from a particular site. <br />Destination can include on -site infiltration such as surface infiltration facilities, drywells <br />and sumps, and soakage trenches, and off -site flow to ditches, drainage ways, rivers and <br />streams, and off -site storm pipes. <br />Drainage Basin: A specific area that contributes stormwater runoff to a particular point of <br />interest, such as a stormwater management facility, stream, wetland, or pipe. <br />Drawdown Time: The amount of time it takes for a facility to percolate runoff from the <br />design storm. <br />Filtration: The percolation of water through designed soils or media with the use of under <br />drains to convey treated runoff from the development site to approved discharge points. <br />Flood Control: The practice of managing stormwater drainage and flood protection. <br />Drainage and flood protection strategies are outlined in the adopted City of Eugene <br />Stormwater Basin Master Plans. <br />Flood Control Design Storm: A theoretical storm for evaluating the capacity of the storm <br />drainage system and designing improvements for the required level of protection. <br />Flow Control: The practice of limiting the peak flow rates and volumes. Flow control is <br />intended to protect downstream properties, infrastructure, and resources from the <br />increased stormwater runoff peak flow rates and volumes resulting from development. <br />Flow Control Facility: Any structure or drainage. device that is designed, constructed, and <br />maintained to collect, retain, infiltrate, or detain surface water runoff during and after a <br />storm event for the purpose of controlling post - development water quantity leaving the <br />development site. <br />Flow - Rate -Based Facility: Facilities such as swales and vegetated filters, oil /water <br />separators, and some proprietary treatment systems which are sized to treat a rate of flow <br />to be conveyed through them. <br />Green Infrastructure: A comprehensive approach to water quality protection defined by a <br />range of natural and built systems and practices that use or mimic natural hydrologic <br />processes to infiltrate, evap otrans pirate, or reuse stormwater runoff on the site where it is <br />generated. <br />Hazardous Material: Any material or combination of materials that, because of its <br />quantity, concentration, or physical, chemical, or infectious characteristics, may cause or <br />significantly contribute to an increase in mortality or an increase in serious, irreversible, or <br />incapacitating reversible illness; or that may pose a present or potential hazard to either <br />human health, safety, or welfare, or animal or aquatic life or the environment when <br />Stormwater Management Manual 1-7 <br />Eugene 2014 <br />