Fibre-optic distributed temperature sensing in combined sewer systems

R. P S Schilperoort, F. H L R Clemens

Research output: Contribution to journalArticleScientificpeer-review

31 Citations (Scopus)


This paper introduces the application of fibre-optic distributed temperature sensing (DTS) in combined sewer systems. The DTS-technique uses a fibre-optic cable that is inserted into a combined sewer system in combination with a laser instrument that performs measurements and logs the data. The DTS-technique allows monitoring in-sewer temperatures with dense spatial and temporal resolutions. The installation of a fibre-optic cable in a combined sewer system has proven feasible. The use of a single instrument in an easy accessible and safe location that can simultaneously monitor up to several hundreds of monitoring locations makes the DTS set-up easy in use and nearly free of maintenance. Temperature data from a one-week monitoring campaign in an 1,850 m combined sewer system shows the level of detail with which in-sewer processes that affect wastewater temperatures can be studied. Individual discharges from house-connections can be tracked in time and space. With a dedicated cable configuration the confluence of wastewater flows can be observed with a potential to derive the relative contributions of contributary flows to a total flow. Also, the inflow and in-sewer propagation of stormwater can be monitored.

Original languageEnglish
Pages (from-to)1127-1134
Number of pages8
JournalWater Science and Technology
Issue number5
Publication statusPublished - 1 Dec 2009


  • Combined sewer systems
  • Distributed temperature sensing
  • Fibre-optics
  • In-sewer processes
  • Temperature monitoring


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