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Wet Detention Ponds
The following screens are used to describe wet detention ponds at source areas and at outfalls. The particle size
distribution is selected (by selecting from a list of pre-developed parameter files) and the pond geometry is entered.
Finally, pond outlets are also described from the list, including weirs, infiltration, evaporation, pumps, and seepage
basins located after the pond. The inflow hydrograph is developed based on the total runoff volume entering the
pond and using a multiple-triangular hydrograph, as described above for biofiltration devices. Any upland
infiltration/biofiltration device located prior to the pond reduces the flow entering the pond. The standard modifiedpuls method for routing the flows through the ponds are used, in conjunction with the surface overflow rate
procedure for routing suspended solids.
An outfall wet detention pond is selected using the “land use\outfall\wet detention” dropdown menu:
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