Ponds and Sedimentation Basins are simply basins or waterbodies (eg. ponds, retarding basins) reliant on the physical settling of suspended solids as the principal treatment mechanism and can reduce peak flows through detaining a volume of the runoff and allowing for slower release during and after the event. Other mechanisms associated with phytoplankton assimilation of soluble nutrients and ultra-violet disinfection are currently not included in the modelling algorithm.
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Defines the equivalent diameter of the outlet pipe (this may not be the diameter of the pipe itself, but the equivalent diameter of its orifices). The outlet pipe is notionally set with an invert at the standing water level of the permanent pool. The pond, detention basin or sedimentation basin dialogue box will display the notional detention time, based on the pond or basin volume, and the Equivalent Pipe Diameter.
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A custom pipe flow, weir flow and storage relationship can be specified to represent custom outlet and storage configurations for ponds, detention basins and sedimentation basins. The outflow relationships can either replace or add to the standard MUSIC outflows. More information on how to use the custom outflow and storage facility is available in this section.
There is an option to re-use water from the Sedimentation Basin, by specifying a demand. The parameters are the same as those for wetlands (refer to this page), with one exception:
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Note that for a sedimentation basin, the default values for k, C* and C** for each of the constituents are as shown in the diagram above.
Threshold Hydraulic Loading for C**
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