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!" °~ ~ i-dAG l2 P N! <br />~1\fGR <br />C ~ C~ \4~A~"E6~t5[-PER <br />~' :~ [~~RTt~SGrS <br />May 2016 <br />release post-development runoff at an allowable rate to minimize flooding and stream bank <br />erosion, and to protect or improve stormwater quality and stream channels. <br />G. CRITICAL STORM: A storm that is determined by calculating the percentage increase in volume <br />of runoff by a proposed development area for the 1 year 24 hour event. The critical storm is used <br />to calculate the maximum allowable stormwater discharge rate from a developed site. <br />H. DEVELOPMENT AREA: A parcel or contiguous parcels owned by one person or persons, or <br />operated as one development unit, and used or being developed for commercial, industrial, <br />residential, institutional, or other construction or alteration that changes runoff characteristics. <br />I. DEVELOPMENT DRAINAGE AREA: A combination of each hydraulically unique watershed <br />with individual outlet points on the development area. <br />DISTURBED AREA: An area of land subject to erosion due to the removal of vegetative cover <br />and/or soil disturbing activities. <br />K. DRAINAGE: The removal of excess surface water or groundwater from land by surface or <br />subsurface drains. - <br />L. EROSION: The process by which the land surface is worn away by the action of wind, water, ice, <br />gravity, or any combination of those forces. <br />M. EXTENDED DETENTION FACILITY: A stormwater control measure that replaces and/or <br />enhances traditional detention facilities by releasing the runoff collected during the stormwater <br />quality event over at least 24 to 48 hours, retarding flow and allowing pollutants to settle within <br />the facility. <br />N. FINAL STABILIZATION: All soil disturbing activities at the site have been completed and a <br />uniform perennial vegetative cover with a density of at least 80% coverage for the area has been <br />established or equivalent stabilization practices, such as the use of mulches or geotextiles, have <br />been employed. <br />O. GRADING: The process in which the topography of the land is altered to a new slope. <br />P. GREEN INFRASTRUCTURE: Wet weather management approaches and technologies that <br />utilize, enhance or mimic the natural hydrologic cycle processes of infiltration, evapotranspiration <br />and reuse. <br />Q. HYDROLOGIC UNIT CODE: a cataloging system developed by the United States Geological <br />Survey and the Natural Resource Conservation Service to identify watersheds in the United <br />States. <br />R. IlVIPERVIOUS COVER: Any surface that cannot effectively absorb or infiltrate water. This may <br />include roads, streets, parking lots, rooftops, sidewalks, and other areas not covered by <br />vegetation. <br />S. INFILTRATION CONTROL MEASURE: A stormwater control measure that does not <br />3 <br />