🌧️ Catchment Runoff: Storm, Manning Flow, Detention Basin, Gate and Pump (2D)

Side view of a rain-fed slope that sheds runoff into a detention basin drained by a gate and a pump, with a spill over a weir when it fills. Set the storm, paved fraction, infiltration, slope, roughness, gate, pump and basin size and follow flows, basin depth and the water budget. Mass balance, time of concentration, orifice drain time and storm depth are checked in the page. A 2D companion of the 3D stormwater environment.