Print Email Facebook Twitter Importance of demand modelling in network water quality models Title Importance of demand modelling in network water quality models: A review Author Blokker, E.J.M. Vreeburg, J.H.G. Buchberger, S.G. Van Dijk, J.C. Faculty Civil Engineering and Geosciences Date 2008-09-25 Abstract Today, there is a growing interest in network water quality modelling. The water quality issues of interest relate to both dissolved and particulate substances. For dissolved substances the main interest is in residual chlorine and (microbiological) contaminant propagation; for particulate substances it is in sediment leading to discolouration. There is a strong influence of flows and velocities on transport, mixing, production and decay of these substances in the network. This imposes a different approach to demand modelling which is reviewed in this article. For the large diameter lines that comprise the transport portion of a typical municipal pipe system, a skeletonised network model with a top-down approach of demand pattern allocation, a hydraulic time step of 1 h, and a pure advection-reaction water quality model will usually suffice. For the smaller diameter lines that comprise the distribution portion of a municipal pipe system, an all-pipes network model with a bottom-up approach of demand pattern allocation, a hydraulic time step of 1 min or less, and a water quality model that considers dispersion and transients may be needed. Demand models that provide stochastic residential demands per individual home and on a one-second time scale are available. A stochastic demands based network water quality model needs to be developed and validated with field measurements. Such a model will be probabilistic in nature and will offer a new perspective for assessing water quality in the drinking water distribution system. Subject OA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:0d09e4e6-3bee-4a28-90d5-149d3e2b2538 Publisher Copernicus Publishers Source Drink. Water Eng. Sci., 1, 27-38, 2008 Part of collection Institutional Repository Document type journal article Rights © Author(s) 2008 Files PDF dwes-1-27-2008.pdf 720.27 KB Close viewer /islandora/object/uuid:0d09e4e6-3bee-4a28-90d5-149d3e2b2538/datastream/OBJ/view