ForebayA pretreatment basin at the inlet of a practice that allow settling out of sediment and associated contaminants suspended in urban runoff. connected to drainage areaThe total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds. in the roadway with a curb cut, overflow visible in the centre of the feature, level spreading is encouraged with the rock check dams, Milwaukee, WI, Photo credit: Aaron Volkening
Rounded 'river rock' and a series of check damsStructures constructed of a non-erosive material, such as suitably sized aggregate, wood, gabions, riprap, or concrete; used to slow runoff water. Can be employed in practices such as bioswales and enhanced grass swales. slow water from the inlet, preventing erosion and promoting infiltration.