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The semi-sewer river: hydraulic backwater effects and combined sewer overflow reverse flows in Central Brussels reduce deoxygenation impact further downstream

par Le, Hong Minh ;Petrovic, Dragana ;Verbanck, Michel
Référence Water science and technology, 69, page (903-908)
Publication Publié, 2013-12-24

Article révisé par les pairs

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Résumé :

In 2011 and 2012 the dissolved oxygen content in the low-discharge river Zenne was monitoredcontinuously, every 5 minutes, downstream of Brussels city centre, making it possible to documentthe complex mechanisms by which combined sewer overflow (CSO) spills affect both the hydraulicsand the oxygen balance of the hydrosystem. In addition to oxygen demand impacts, proportions ofwater volumes are such that the oxygen-devoid sewage water discharged from CSOs contributessignificantly to the oxygen deficit observed in the river further downstream. It is shown that ensuingunexpected hydraulic behaviour, such as a full river-flow reversal, can explain the dual nature ofoxygen sag following major CSO events. At times the semi-sewer river plays the role of an in-streamstormwater tank, effectively attenuating the environmental impacts of Brussels CSOs.