Ponds and Sedimentation Basins are simply basins or waterbodies water bodies (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.
MUSIC provides separate Treatment Nodes for Ponds, Detention Basins and Sedimentation Basins, which are modelled in exactly the same way as each other, but have different default k, C* and CSTR values (refer to Appendix G : - Selecting Appropriate k and C* Values for advice on selecting appropriate k, C* and CSTR values for particular treatment measures). Neither the Pond or nor the Sedimentation Basin treatment nodes include a provision to enter an inlet pond volume. The Pond node is similar to the macrophyte cell in a wetland, but with different default k, C* and CSTR values to represent their different water quality treatment behaviour.
Pond, Detention and Sedimentation Basin Properties
The initial properties properties dialogue box contains the parameters that describe the basic physical characteristics of the pond, detention basin or sedimentation basin. A description of each of the parameters is given below.
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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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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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