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§ 1011.06 DEFINITIONS. Unless specifically defined below, words or phrases used in this chapter shall be interpreted so as to give them the same meaning as they have in common usage and to give this chapter its most reasonable application. For the purpose of this chapter, the words MUST and SHALL are mandatory and not permissive. All distances, unless otherwise specified, shall be measured horizontally. As used in this chapter, the following words and terms shall have the meanings ascribed to them in this section. 100 -YEAR FLOOD ELEVATION. The elevation of water resulting from the Critical Duration Flood Event. BEST MANAGEMENT PRACTICES (BMP's). Measures taken to minimize negative effects on water resources and systems as documented in the Minnesota Construction Site Erosion and Sediment Control Planning Handbook (MBWSR, 1988), Protecting Water Quality in Urban Areas (MPCA, 2000) and the Minnesota Stormwater Manual (MPCA, 2014) as amended. BETTER SITE DESIGN (BSD). An approach to managing runoff that seeks to attain post development hydrology which mimics the undeveloped condition in terms of volume, rate and timing of runoff. The goals of BETTER SITE DESIGN include reducing the amount of impervious cover, increasing the amount of natural lands set aside for conservation, using pervious areas for more effective stormwater treatment, innovative grading and drainage techniques and through the review of every aspect of the project site planning process. BETTER SITE DESIGN involves techniques applied early in the 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. 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. 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, DRAFT ORD 09-15 CHAPTER 1011STORMWATER & ESC ORDINANCE.DOCX 4/29