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design process to reduce impervious cover , conserve natural areas and use pervious <br /> areas to more effectively treat stormwater runoff and promote a treatment train <br /> approach to runoff management . <br /> WIN <br /> BIOPIC TRA TION. <br /> rerrneye ) nFatei vela erne, tt m , l h o � g4pnf � r� � r� ir� ftnn . _ _ A bioretention practice in which an <br /> underdrain is used . Typically , most of the water entering MIN the biofiltration practice enters <br /> the underdrain and is returned to the stormwater system , but some water infiltrates <br /> ( unless the BMP has an impermeable liner) or evapotranspires . The underdrain may be <br /> at or elevated above the bottom of the practice ( i . e . at the media - soil interface ) ._ <br /> BIORTTENTION. A soil and plant - based stormwater management best <br /> management practice( BMP ) used to filter runoff . <br /> BRIDGE. A road , path , railroad or utility crossing over a waterbody , wetland , ditch , <br /> ravine , road , railroad or other obstacle . <br /> BRIDGE SPAN . The clear span between the inside surfaces of a bridge ' s terminal <br /> supports . <br /> CHANNEL . A perceptible natural or artificial depression , with a defined bed and <br /> banks that confine and conduct water flowing either continuously or periodically . <br /> CONSTRUCTION ACTIVITY. Activities including clearing,,grading , and excavating , <br /> that result in land disturbance of equal to or greater than one acre , including the <br /> disturbance of less than one acre of total land area that is part of a larger common plan <br /> of development or sale if the larger common plan will ultimately disturb equal to or <br /> greater than one acre . This includes a disturbance to the land that results in a change in <br /> the topography , existing soil cover; ( both vegetative and nonvegetative ) , or the existing <br /> soil topography that may result in accelerated stormwater runoff that may lead to soil <br /> erosion and movement of sediment . Construction activity does not include a disturbance <br /> to the land of less than five acres for the purpose of routine maintenance performed to <br /> maintain the original line and grade , hydraulic capacity , and original purpose of the <br /> facility . Routine maintenance does not include activities such as repairs , replacement <br /> and other types of non - routine maintenance . Pavement rehabilitation that does not <br /> disturb the underlying soil e . g . , mill and overlay projects ) is not construction activity . <br /> . . <br /> . . <br /> 5 <br />