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and safety, aesthetics, maintainability, capacity of existing infrastructure, and sustainabilify . are important characteristics of a site's stormwater management plan. Stormwater Management Faelllty. Any structure or configuration of the ground that is used as, or by its location becomes, a place where stormwater flows or is accumulated, including but not limited to, pipes, manholes, catch basins, ponds, open drainage ways, runoff control facilities, wetlands, and their accessories. Stormwater Qualfty Facility: Any structure or drainage device. that is designed, constructed, and maintained to collect and filter, retain, or detain surface water runoff during and abler a storm event for the purpose of maintaining or improving surface and /or groundwater quality. Srrr face Conveyance: The transport of stormwater on the ground surface from one point to another. Surface InflItrartfon Facility. A facility designed to receive and infiltrate stormwater runoff at the ground surface to meet stormwater flood control requirements. Stu face Retention Facility: A facility designed to receive and hold stormwater runoff at the ground surface. Rattier than storing and releasing the entire runoff volume, surface retention facilities permanently retain a portion of the water on -site, where it infiltrates, evaporates, or is absorbed by surrounding vegetation. Tenant Improvements: Upgrades made to the interior or exterior of buildings to meet the needs of the tenant Tenant improvements may trigger Chapter 3.0 Source Controls if they. take place on sites with specifled high -risk activities. 71me of Concentration (TJ: The amount of time it takes stormwater runoff to travel from the most distant point (measured by travel time) on a particular site or drainage basin to a particular point of interest, such as to an on -site retention system. Total Suspended Solids (TSS): Matter suspended in stormwater excluding litter, debris, and other gloss solids exceeding 1 millimeter in diameter. Underground.h4ection Control (VIC): A federal program under the Safe Drinking Water Act, delegated to the Oregon Department of Environmental Quality (DEQ), which regulates the injection of water below ground. The intent of the program is to protect groundwater aquifers, primarily those used as a source of drinking water, from contamination. Vegetated Facilities. As used in this manual, stormwater management facilities that rely on plantings to enhance their performance. Plantings can enhance many facility functions, Including infiltration, pollutant removal, water cooling flow calming, and prevention of erosion. Volume -Based Facr7ity: A stormwater quality facility, such as a wet potrd, which is sized to store and treat a particular volume of runof. storrmwaw Mamgement Manual 1 -li Eugene 2014