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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The initial 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.
A conceptual diagram of the pond, detention basin and sedimentation basin properties in MUSIC is presented below:
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Evaporation from the permanent pool of a pond, detention basin or sedimentation basin can be modelled by defining the evaporative loss rate, defined as a percentage of the daily Potential Evapotranspiration data contained in the Meteorological Template used to create the model. The water that evaporates from the permanent pool of the pond or sedimentation basin is lost from the catchment. Contaminants in the water that is lost to evaporation remain within the permanent pool.Estimate Parameters
This feature which estimates the storage properties for sedimentation basin is not available at this stage.
Outlet Properties
The physical characteristics of the outlet pipe and weir are defined in this section of the dialogue box.
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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.
Estimate Parameters
There is an option to set up the parameters in Sedimentation Basin as shown in figure below:
Clicking will open the Estimate Parameters opens the dialog box as below:
The parameters are the same as those for wetlands (refer to this page), with one exception:
Permanent Pool Volume
This value is calculated based on two parameters that were specified in the Properties for Sedimentation dialogue box - Permanent Pool Depth and Initial Surface Area.
Re-use
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:
Permanent Pool Volume
This value is calculated based on two parameters that were specified in the Properties for Sedimentation dialogue box - Permanent Pool Depth and Initial Surface Area.
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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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