HESS Hydrology and Earth System Sciences HESS Hydrol. Earth Syst. Sci. 1607-7938 Copernicus Publications Göttingen, Germany 10.5194/hess-18-1119-2014 Water displacement by sewer infrastructure in the Grote Nete catchment, Belgium, and its hydrological regime effects Vrebos D. 1 Vansteenkiste T. 2 Staes J. 1 Willems P. https://orcid.org/0000-0002-7085-2570 2 3 Meire P. 1 Department of Biology, Universiteit Antwerpen, Universiteitsplein 1, 2610 Wilrijk, Belgium Department of Civil Engineering, KU Leuven, Kasteelpark Arenberg 40, 3001 Leuven, Belgium Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium 26 03 2014 18 3 1119 1136 Copyright: © 2014 D. Vrebos et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://hess.copernicus.org/articles/18/1119/2014/hess-18-1119-2014.html The full text article is available as a PDF file from https://hess.copernicus.org/articles/18/1119/2014/hess-18-1119-2014.pdf

Urbanization and especially increases in impervious areas, in combination with the installation of wastewater treatment infrastructure, can impact the runoff from a catchment and river flows in a significant way. These effects were studied for the Grote Nete catchment in Belgium based on a combination of empirical and model-based approaches. Effective impervious area, combined with the extent of the wastewater collection regions, was considered as an indicator for urbanization pressure. It was found that wastewater collection regions ranging outside the boundaries of the natural catchment boundaries caused changes in upstream catchment area between −16 and +3%, and upstream impervious areas between −99 and +64%. These changes lead to important intercatchment water transfers. Simulations with a physically based and spatially distributed hydrological catchment model revealed not only significant impacts of effective impervious area on seasonal runoff volumes but also low and peak river flows. Our results show the importance, as well as the difficulty, of explicitly accounting for these artificial pressures and processes in the hydrological modeling of urbanized catchments.

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