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QUANTIFYING BASE INFILTRATION IN SEWERS: A Comparison of Methods and a Simple Empirical Solution

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This paper addresses three empirical methods used to determine degree of Base Infiltration (BI) in 45 isolated sewer basins throughout the Orange County Sanitation District (OCSD) collection system. These include a common estimation method called night-time “Wastewater Production”, a second method called “Minimum Flow Factor”, and a third empirical method employing the “Stevens-Schutzbach” equation. These empirical methods were tested against a chemical parameter verification method that involves regressing hourly concentrations of several common wastewater chemical analysis parameters (Chemical Oxygen Demand – COD, etc.) with hourly sewage flow rates. The chemical parameter method results were also compared to BI estimates based on potable water use records.

In addition the Wastewater Production and Stevens-Schutzbach methods were evaluated by comparing the BI predictions to the sewer flows during the Northeast Power Blackout of 2003.

Results to date indicate that the Stevens-Schutzbach equation provides a more accurate estimate of BI in basins yielding flows comprised of more than 20% BI.
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Document Type: Research Article

Publication date: 2007-01-01

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