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Water Science & Technology Vol 66 No 7 pp 1534–1539 © IWA Publishing 2012 doi:10.2166/wst.2012.347

Settlement as a driver for sewer rehabilitation

J. Dirksen, E. J. Baars, J. G. Langeveld and F. H. L. R. Clemens

Department of Watermanagement, Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, NL-2600 GA, Delft, The Netherlands E-mail: j.dirksen@tudelft.nl
Waternet, P.O. Box 94370, NL-1090 GJ, Amsterdam, The Netherlands
Royal Haskoning, Barabarossastraat 35, Nijmegen, 6522DK, The Netherlands
Witteveen + Bos, PO Box 233, Deventer, 7400AE, The Netherlands


ABSTRACT

This paper assesses the influence of (differential) settlement on sewer system functioning. Based on historical data of the vertical position of sewer invert levels, tilt measurements and in-sewer inspection videos, settlement and settlement related influences are analyzed for a case study area in Amsterdam. The average settlement rate of this system was 4 mm/year. Given this settlement rate, it is shown that settlement significantly influences sewer system functioning within the lifetime of a sewer (system).

Keywords: asset management; combined sewer system; deterioration; settlement


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