A bottom-up approach of stochastic demand allocation in water quality modelling

A bottom-up approach of stochastic demand allocation in water quality modelling

Blokker, E.J.M.
Vreeburg, J.H.G.
Beverloo, H.
Klein Arfman, M.
Van Dijk, J.C.

Civil Engineering and Geosciences

Water Management

2010-01-04

An “all pipes” hydraulic model of a DMA-sized drinking water distribution system was onstructed with two types of demand allocations. One is constructed with the conventional op-down approach, i.e. a demand multiplier pattern from the booster station is llocated to all demand nodes with a correction factor to account for the average water emand on that node. The other is constructed with a bottom-up approach of demand allocation, i.e., each individual home is represented by one demand node with its own tochastic water demand pattern. The stochastic water demand patterns are constructed with an end-use model on per second basis and per individual home. The flow entering the test area was easured and a tracer test with sodium hloride was performed to measure travel imes. The two models were evaluated on the predicted sum of demands and travel times, compared with what was measured in the test area. The new bottom-up approach performs at least as well as the conventional top down approach with respect to total demand and travel times, without the need for any flow measurements or calibration measurements. The bottom-up approach leads to a stochastic method of hydraulic modelling and gives insight into the variability of travel times as an added feature beyond the conventional way of modelling.

http://resolver.tudelft.nl/uuid:3ed3e8bd-da1f-49f5-a87a-60899bc67c4c

Copernicus Publications

1996-9457

Drinking Water Engineering and Science Discussions, 3 (1), 2010

Institutional Repository

journal article

© 2010 The Author(s) ; Creative Commons 3.0