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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Overflow Weir Width
Defines the width of the overflow weir for the pond, detention basin or sedimentatin sedimentation basin. The overflow weir will only start to carry a discharge of water once the depth in the pond reaches the Extended Detention Depth defined above.
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A reporting window will then be presented showing the water balances for various inflows and outflows at the sedimentation basin as shown below.
It is possible to view or save various flows and water quality as below for the pond or sedimentation or detention basin:
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The advanced properties section (opened using Advanced Tab) of the sedimentation basin, pond or detention basin displays the parameters that describe the hydraulic characteristics for the outflow structures, and the parameters that describe the treatment process in the pond, detention basin or sediment basin as shown below.
Orifice Discharge Coefficient
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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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