A Comparison of Methods and a Simple Empirical Solution to Quantifying Base Infiltration in Sewers
This paper addresses three empirical prediction methods used to estimate the magnitude of Base Infiltration (BI) in 45 isolated sewer basins throughout the Orange County Sanitation District (OCSD) collection system: night-time "Wastewater Production", "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 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: 2007-12-01
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