Author： Mitchem Charles Scarano Jeff Gray Amanda
Publisher： Water Environment Federation
ISSN： 1938-6478
Source： Proceedings of the Water Environment Federation, Vol.2009, Iss.13, 2009-01, pp. : 3323-3333
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Abstract
Bacteria loads from a combined sewer system were simulated as part of the development of seven Total Maximum Daily Loads in the Middle James River watershed in Lynchburg, Virginia. The lack of an available sewer system model, limited data describing overflows, and a rigid project schedule made it necessary to simulate these loads using a simplified but laborious approach. Linear regressions of available data were performed to characterize system responses and fill gaps in the data. These regressions were used to estimate overflow responses to simulated precipitation and synchronize the responses with the model. This approach adequately simulated the bacteria loads from the combined sewer, with no false spikes and an estimated annual bacteria load of the same magnitude as the bacteria load estimated by the City's system model. While the approach provided a good result for the data conditions encountered, use of combined sewer models is preferred when available.
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