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Storm water management programs are required by TMDLs and NPDES permits to reduce pollutant loadings through the implementation of BMPs. Compliance with these regulatory requirements will require better definition of the characteristics of pollutants in storm water runoff and new methods to determine the effectiveness of BMPs to achieve specific reduction in pollutant loadings.

Current methods of sample collection and analytical methods have been found to underestimate the suspended sediments in storm water. Techniques commonly used to sample storm water do not collect representative samples of the bedload that carry the mass of pollutants or sample the wide range of particle sizes found in storm water. The USGS reports that the TSS method of analysis to determine concentrations of suspended sediments can result in unacceptably large errors and is fundamentally unreliable and use of TSS data can result in loading errors of several orders of magnitude.

Research, development and standardization of new and improved sample collection and sample management techniques and additional analytical methods are needed to better characterize storm water pollutants. The Mass Balance Approach is proposed to determine the effectiveness of suspended sediment-capture BMPs.

Document Type: Research Article


Publication date: 2002-01-01

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