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Simplified Model to Estimate Suspended Sediment Effluent Concentrations due to Scour from Catchbasin Sumps

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The sediment removal ability of catchbasin sumps and hydrodynamic separators must be balanced with their ability to retain the captured material by preventing scour. Therefore, understanding and quantifying scour processes in catchbasin devices is important when considering these devices as part of a stormwater management plan. However, simple models to estimate the scour rate from these stormwater treatment devices have not been available, and the few researchers investigating these processes have relied on large-scale laboratory tests and computational fluid dynamics (CFD) modeling.

A simplified model to estimate the sediment scour rate, based on statistical analyses of full-scale tests, is presented in this paper. The model includes response surfaces of the effluent suspended sediment concentration (SSC) for different conditions. The simplified model for sediment scour in catchbasin sumps is a useful tool for evaluating the treatment ability of these common devices, especially when implemented in stormwater modeling software packages.
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Keywords: CFD modeling; Catchbasin; hydrodynamics; physical modeling; sediment scour

Document Type: Research Article

Publication date: 2009-01-01

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