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USEPA Sewer Electro Scan Field Demonstration Revisited

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Potential Rain Dependent Infiltration (RDI) flows are a critical parameter for the design and prioritization of sewer collection system infiltration mitigation projects. An estimate of RDI flows may be obtained from the defect current measured by an electro scan of a pipe. RDI flow has been calculated for the pipes electro scanned during the USEPA sponsored field demonstration. The field demonstration included CCTV inspection of the pipes. For pipe defects that are potential sources of RDI, the comparison with CCTV showed that electro scan is highly reliable, identified 2.1 times more defects and that many of the defects missed by CCTV were potentially the largest sources of infiltration. The distribution of the electro scan estimated RDI flow was significantly more variable than that shown by CCTV. This reveals the potential use of electro scan to target and design rehabilitation projects that will significantly reduce RDI at considerably lower cost.
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Document Type: Research Article

Publication date: 2012-01-01

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