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The composition of storm water sewage and the occurring pollutants are specific for
a given basin and rainfall event. The proper and precise assessment of storm water quality may be
performed only basing on the direct measurements of outflow from a given catchment, which are
valid only for the analyzed basin and tested set of parameters. Concentrations of the pollutants
observed in storm water vary significantly, sometimes even exceeding the typical concentrations
noted in sanitary wastewaters.
The discussed changeable concentrations of pollutants result from varied manner of basin
management, type and sealing degree of the surface, intensity of road transport, variable rainfall
characteristics and length of dry period between the consecutive rainfall events as well as
characteristics and properties of drainage system, especially its abilities to collect sediments which can
be removed in significant amounts by storm waters of high flow rate. The high concentrations of
pollutants, usually in the form of suspension, are typical for undeveloped catchments with possible
erosion of soil surface. In case of high sealing of urbanized areas, especially in case of roads, streets,
pavements and parking lots, large amount of heavy metals and oil derivatives can be expected.
This paper presents the attempt of assessment of river water and storm water quality for a
selected urbanized catchment of the Bystrzyca River, Lublin, Poland. The tested basin covered
approx. the 4 km2 catchment of pipeline located in Muzyczna St. on the western bank of the
Bystrzyca River. Our studies covered the selected period, one month, in three following years
2011, 2012 and 2013. River water was sampled before and after the storm water system outlet,
while storm water was sampled in the discharge location. The following physical parameters of
river water and storm water were tested: pH, dissolved oxygen, colour and turbidity, according to
Polish and European standards.
The results of measurements were analyzed in relation to noted heights of rainfall
events. Then, the basic statistics procedures were applied to determine correlation between the
tested physical parameters of water and storm water for the same period of observation and the
same location as well as for the various combinations of sampling locations and all tested periods
of measurements. The resultant matrices of correlation for all the tested parameters were
presented in paper.
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