Author(s): Tommaso Boschetti; Aldo Tralli; François Clemens

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Keywords: Computational Fluid Dynamics; CSO; Q-h relationship; Weir; Box-Behnken design

Abstract: This study documents the use of Computational Fluid Dynamics (CFD) to obtain accurate Q-h relations on two weir structures in the urban drainage system in the municipality of Eindhoven, in the Netherlands. The accurate determination of weir discharges is of key importance for control and evaluation purposes. The most common method is performing a level measurement and calculating the discharge using the level-discharge relation. Since this standard relation is only valid in certain conditions, this can lead to large deviations from the actual discharge in a real-life situation: calibrated parameters, relevant for a specific weir, would be needed, but are rarely determined because of costs and practical reasons. As a consequence, large uncertainties exist in the determination of the flow near weirs, despite the availability of measurements. The CFD methodology validated by Van Daal et al. (2014) against experimental data, is further documented here and applied to two different non-standard weirs: the Q-h relations obtained via CFD are compared with the standard equations and the discrepancies are quantified. The end goal is to implement this enhanced information to the wastewater control system of the municipality.

DOI:

Year: 2015