01-09-2023 City Council Packet - Laserfiche WebLink

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5 design process to reduce impervious cover, conserve natural areas and use pervious areas to more effectively treat stormwater runoff and promote a treatment train approach to runoff management. BIOFILTRATION. A stormwater quality and quantity BMP that utilizes vegetation and soil to filter and absorb pollutants including nutrients, hydrocarbons and metals and remove water volume through evapotranspiration. 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 plant-based stormwater management 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. . Includes construction activity as defined in 40 C.F.R. pt. 122.26(b)(14)(x) and small construction activity as defined in 40 C.F.R. pt. 122.26(b)(15). This includes a disturbance to the land that results in a change in the topography, existing soil cover (both vegetative and non-vegetative), or the existing soil topography that may result in accelerated stormwater runoff, leading to soil erosion and movement of sediment into surface waters or drainage systems. Examples of CONSTRUCTION ACTIVITY may include clearing, grading, filling, and excavating. CONSTRUCTION ACTIVITY includes the disturbance of less than one acre of total land area that is a part of a larger common plan of development or sale if the larger common plan will ultimately disturb one acre or more.