12-12-2022 City Council Packet - Laserfiche WebLink

Home Search

BIOFILTRATION. A stormwater quality i and quaRtity BMP that utilizes ycgetatiOR and semi to folter and absorb pollutants inGluding nutrients, hydrOGarbons and metals and remove water volume through eyapo+roncniro+irin. A_ bioretention practice in which an underdrain is used. Typically, most of the water entering the biofiltration practice enters the underdrain and is returned to the stormwater system, but some water infiltrates (unless the BMP has an impermeable liner) or evapotranspires. The underdrain may be at or elevated above the bottom of the practice (i.e. at the media -soil interface) BIORETENTION. A soil and Dlant-based stormwater manaaement best management practice (BMP) used to filter runoff. BRIDGE. A road, path, railroad or utility crossing over a waterbody, wetland, ditch, ravine, road, railroad or other obstacle. BRIDGE SPAN. The clear span between the inside surfaces of a bridge's terminal supports. CHANNEL. A perceptible natural or artificial depression, with a defined bed and banks that confine and conduct water flowing either continuously or periodically. CONSTRUCTION ACTIVITY. Activities including clearing, grading, and excavating, that result in land disturbance of equal to or greater than one acre, including the disturbance of less than one acre of total land area that is part of a larger common plan of development or sale if the larger common plan will ultimately disturb equal to or greater than one acre. This includes a disturbance to the land that results in a change in the topography, existing soil cover; (both vegetative and nonvegetative), or the existing soil topography that may result in accelerated stormwater runoff that may lead to soil erosion and movement of sediment. Construction activity does not include a disturbance to the land of less than five acres for the purpose of routine maintenance performed to maintain the original line and grade, hydraulic capacity, and original purpose of the facility. Routine maintenance does not include activities such as repairs, replacement and other types of non -routine maintenance. Pavement rehabilitation that does not disturb the underlying soils (e.g., mill and overlay projects) is not construction activity. GenstruGtmen a tiyity as defined in 40 G.F.R. n+ 122.26(b)(15). This innlusloe• a dosturbaRGe to the land that results OR a GhaRge OR the topography, exiStiRg Son! Geve (both vegetative and non vegetative), or the existing semi topography that may result On surfano waters or drainage systems. Examples of CONSTRUCTION ACTIVITY magi , the dnsturb-Anr-.Z'�-f lesq- tI.h.-;;.n. -n.n.e ac;re of total land area that is a part of a largeF GOMmen plan of developmeRt or sale Of the larger COMMOR plaR Will ultimately disturb ORe aGre or more. CONVEYANCE SYSTEM. Open channel. DiDe or tile that is not a Public Drain System. A portion of a conveyance system is defined as "regional" if it carries flows from a drainaae area of areater than 200 acres. CRITICAL DURATION FLOOD EVENT. The 100-year precipitation or snow melt event with a duration resulting in the maximum 100-year return period water surface 5