Solid splash pad preventing erosion from the flow from the inlet. Image credit Dylan Passmore
Forebay connected to drainage area in the roadway with a curb cut, overflow visible in the centre of forebay area, level spreading is encouraged with the rock check dams, Milwaukee, WI, Photo credit: Aaron Volkening
The 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.
A pretreatment basin at the inlet of a practice that allow settling out of sediment and associated contaminants suspended in urban runoff.