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Water Science & Technology Vol 68 No 8 pp 1723–1730 © IWA Publishing 2013 doi:10.2166/wst.2013.419

Searching for storm water inflows in foul sewers using fibre-optic distributed temperature sensing

Rémy Schilperoort, Holger Hoppe, Cornelis de Haan and Jeroen Langeveld

Royal HaskoningDHV, PO Box 151, NL-6500 AD, Nijmegen, The Netherlands E-mail: remy.schilperoort@rhdhv.com
Dr. Pecher AG, Klinkerweg 5, D-40699, Erkrath, Germany
Delft University of Technology, PO Box 5048, NL-2600 GA, Delft, The Netherlands


ABSTRACT

A major drawback of separate sewer systems is the occurrence of illicit connections: unintended sewer cross-connections that connect foul water outlets from residential or industrial premises to the storm water system and/or storm water outlets to the foul sewer system. The amount of unwanted storm water in foul sewer systems can be significant, resulting in a number of detrimental effects on the performance of the wastewater system. Efficient removal of storm water inflows into foul sewers requires knowledge of the exact locations of the inflows. This paper presents the use of distributed temperature sensing (DTS) monitoring data to localize illicit storm water inflows into foul sewer systems. Data results from two monitoring campaigns in foul sewer systems in the Netherlands and Germany are presented. For both areas a number of storm water inflow locations can be derived from the data. Storm water inflow can only be detected as long as the temperature of this inflow differs from the in-sewer temperatures prior to the event. Also, the in-sewer propagation of storm and wastewater can be monitored, enabling a detailed view on advection.

Keywords: DTS; foul sewers; storm water inflows; temperature monitoring


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