Author(s): T. Julinek; J. Riha
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Keywords: No keywords
Abstract: Water quality in streams passing through urbanized areas is often harmed by discharges from point sources of pollution. One of the significant pollution sources is stormwater overflows on the sewer network. Especially during periods with low discharge in rivers, the water released from overflows can cause high concentration of pollution to be flushed out from the sewer network. Numerical models are frequently used to quantify the effect of such stream pollution. In this paper, the results of computer modelling of the impact of sewer network overflows on the stream water quality in the city of Brno are shown. The considered river network consists of the Svratka and Svitava Rivers, which are the main receivers in Brno, and also of two small local streams, the Leskava and Ponavka Rivers. The design rainfall event and the design scenarios, such as the location and parameters of storm retention tanks and stormwater overflows, were set up by the designer of the sewer network reconstruction project. The assessment of the impact of the pollution released from overflows on stream water quality was carried out for the present state of the sewer network and for the proposed measures to be applied to it. These proposed measures consisted mainly of structural modifications to the overflows and a proposal for new stormwater tanks. The numerical modelling of stream water quality was carried out using MIKE11 computer code.
Year: 2016