![]() ![]() Dĭetention: Release of surface and stormwater runoff from the site at a slower rate than it is collected by the drainage facility system, the difference being held in temporary storage.ĭetention Facility: A facility that collects water from developed areas and releases it at a slower rate than it enters the collection system. Curbs and gutters are often referred to as gray infrastructure. Conveyance systems are made up of natural elements and of constructed facilities.Ĭritical Areas: These are areas where flooding and/or erosion conditions present an imminent likelihood of harm to the welfare and safety of the surrounding community.Ĭulvert: Pipe or concrete box structure which drains open channels, swales, or ditches under a roadway or embankment typically with no catch basins or manholes along its length.Ĭurb and Gutter: Pathway along streets that directs stormwater to a storm drain and into a pipe to be transported to a stream or river. Learn more about the Clean Water Act on the Environmental Protection Agency's website.Ĭonstructed Conveyance System Facilities: Gutters, ditches, pipes, channels, and most flow control and water quality treatment facilities.Ĭonveyance System: Drainage facilities and feathers that collect, contain, and provide for the flow of surface and storm water from the highest points on the land down to a receiving water. Cisterns are distinguished from wells by their waterproof liningsĬlean Water Act (CWA): The federal environmental law that includes the management of stormwater. ![]() Cisterns are often built to catch and store rainwater. Channels may be constructed or natural.Ĭistern: A waterproof receptacle for holding liquids, usually water. There are a number of shapes, sizes, and configurations of inserts available.Ĭhannel: A long, narrow excavation or surface feature that conveys surface water and is open to the air. Also referred to as a Manhole, Control Manhole, or Maintenance Access Hole.Ĭatch Basin Insert: A device installed underneath a catch basin inlet to treat stormwater through filtration, settling, absorption, adsorption, or a combination of these mechanisms. These basins may also be required when larger diameter culverts are used. It may contain a Flow Restrictor/Oil Pollution control device. Also referred to as Inlet.Ĭatch Basin, Type 2: A round concrete underground basin (4' - 8' diameter 6' or greater deep). Water may also enter/exit through culverts visible in the side walls of basin. CĬatch Basin, Type 1: An underground concrete water receiving inlet, rectangular in shape (approximately 3' x 2' x 4' deep) with a slotted iron grate on top to inlet water or a solid rectangular cover. A buffer may also be a designated area adjacent to or part of a stream or wetland that is an integral part of the stream or wetland ecosystem. ![]() It may result from mixing of seawater with fresh water, as in estuaries, or it may occur in brackish fossil aquifers.īuffer: A designated area adjacent to and a part of a steep slope or landslide hazard area which protects slope stability, attenuation of surface water flows, and landslide hazards reasonable necessary to minimize risk. Learn more about bioswales.īrackish water: Water that has more salt than freshwater, but not as much as seawater. Grass is the most common vegetation for bioswales, but wetland vegetation is an option if the soil is saturated. Bioinfiltration uses plants and soil to help rainwater soak in.īioswale: A long, shallow ditch with gently sloping sides and various layers of soils beneath intended to slow stormwater runoff and direct it to an area where it can soak in. Learn about simple BMPs you can do every day.īioinfiltration: Bio refers to living things. Learn more about beavers and regulations on the Washington Department of Fish & Wildlife's website.īerm: A constructed barrier of compacted earth.īest Management Practices (BMPs): A Best Management Practice is a behavior or action that a person performs that protects the health of the environment. It is a non-lethal beaver management technique. Bīackwater: Water upstream from an obstruction which is deeper than it would normally be without the obstruction.īaffle: A device to deflect, regulate, or check flow.īasin: Any area draining to a point of interest, like into the Sammamish River.īeaver Deceiver: A constructed flow device that reduces beaver damming activities. Rainwater soaks into the ground and fills aquifers. Aquifer: A layer of sand, gravel and clay below the earth’s surface with enough water or people to withdraw for use (through wells and springs). ![]()
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