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Evaluating Scour Potential in Stormwater Catchbasin Sumps Using a Full-Scale Physical Model and CFD Modeling

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Field observations have shown that direct short-term measurements of performance of stormwater controls is not always adequate when determining long-term benefits of a control program. One of the major problems encountered is the possible scour of pre-deposited sediments under some conditions, resulting in discharges of previously removed contaminants. Understanding scour phenomenon in stormwater control devices is a real need when implementing protocols and rules for preventing and managing polluted stormwater runoff, such as required by the Wisconsin Department of Natural Resources (WDNR) for proprietary stormwater controls. This paper presents experimental results of scour of pre-deposited sediment in catchbasin sumps obtained by conducting tests with a full-scale physical model. Turbidity, Suspended Solid Concentration (SSC), and Particle Size Distributions (PSD) of the scoured material leaving the device were analyzed. The methodology and results obtained during the calibration of a 3D CFD model for the evaluation of the hydrodynamics in a conventional catchbasin are also presented.
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Document Type: Research Article

Publication date: 01 January 2008

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