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Water Science & Technology: Water Supply In Press, Uncorrected Proof © IWA Publishing 2013  |  doi:10.2166/ws.2013.176

Modelling both the continual erosion and regeneration of discolouration material in drinking water distribution systems

W. R. Furnass, R. P. Collins, P. S. Husband, R. L. Sharpe, S. R. Mounce and J. B. Boxall

Civil and Structural Engineering, Pennine Water Group, University of Sheffield, Sir Frederick Mappin Building, Mappin St, Sheffield, S1 3JD E-mail: wrfurnass1@sheffield.ac.uk

First received 29 November 2012; accepted in revised form 14 June 2013. Available online 13 September 2013


ABSTRACT

The erosion of the cohesive layers of particulate matter that causes discolouration in water distribution system mains has previously been modelled using the Prediction of Discolouration in Distribution Systems (PODDS) model. When first proposed, PODDS featured an unvalidated means by which material regeneration on pipe walls could be simulated. Field and laboratory studies of material regeneration have yielded data that suggest that the PODDS formulations incorrectly model these processes. A new model is proposed to overcome this shortcoming. It tracks the relative amount of discolouration material that is bound to the pipe wall over time at each of a number of shear strengths. The model formulations and a mass transport model have been encoded as software, which has been used to verify the model's constructs and undertake sensitivity analyses. The new formulations for regeneration is conceptually consistent with field and laboratory observed data and has potential value in the proactive management of water distribution systems, such as evaluating change in discolouration risk and planning timely interventions.

Keywords: discolouration; distribution networks; water quality modeling


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