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Development Footprhab The new or redeveloped area covered by buildings or other roof structures and other impervious surface areas, such as roads, parking lots, and sidewalks. Discharge Point- The ultimate destination for the stormwater runoff from a particular site. Destination can include on -site infiltration such as surface infiltration facilities, . drywells and sumps, and soakage trenches, and off -site flow to ditches, drainage ways, rivers and streams, and off -site storm pipes. Dr ainarge Basin: A specific area that contributes stormvarater runoff to a particular point of interest, such as a stormwater management facility, stream, wetland, or pipe. - DrwWown 77me: The amount of time it takes for a fadlity to percolate runoff from the design storm. FHOution: The percolation of water through designed soils or media with the use of under drains to convey treated runoff from the development site to approved discharge points: Flood Control_ The practice of managing stormwater drainage and flood protection. Drainage and flood protection strategies are outlined in the adopted' City of Eugene Stormwater Basin Master Plans. T Flood Control Design Storm: A theoretical storm for evaluating the capadty of the storm drainage system and designing improvements for the required level of protection. Flow Control: The practice of limiting the peak flow Yates and volumes. Flow control is Intended to protect downstream properties, infrastructure, and resources from the increased stormwater runoff peak flow rates and volumes resulting from development: Flow Contr9oI Fa dlity: Any structure or drainage device that is designed, constructed, and maintained to collect, retain, infiltrate, or detain surface water runoff during and after a storm event for the purpose of controlling post-development water quantity leaving the development site. Flow -Rate -Based Futility- Facilities such as swales and vegetated filters, oil/water separators, and some proprietary Uvatment systems which are sized to treat a rate of flow to be conveyed through them. Green Infr rcture A comprehensive approach to water quality protection defined by a range of natural and built systems and practices that use or mimic natural hydrologic processes to infiltrate, evapotranspirate, or reuse stormwater runoff on the site where it is generated. Hazardous Materlah -Any material or combination of materials that, because of its quantity, concentration, or physical, chemical, or infectious characteristics, may cause or significantly contribute to an increase in mortality or an increase in serious, irreversible, or incapacitating reversible illness, or that may pose a present or potential hazard to either human health, safety, or welfare, or animal or aquatic life or the environment when Sw mwater Managmea Manual 1 -7 Eugene 2014