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Recent developments in urban storm drainage are reviewed starting with rainfall/runoff processes, followed by discussions of combined sewage, drainage impacts on receiving waters, impact mitigation, hydroinformatics, regulatory programs and conclusions. The most promising trends in this field include improvements in spatial definition of rainfall data, runoff modelling with a limited number of model parameters and recognition of modelling uncertainties, analytical statistical modelling of runoff quality, advances in the understanding and modelling of sewer sediment transport, the use of biomonitoring and modelling in assessing drainage impacts on receiving waters, further refinement of best management practices for stormwater management, development of new processes for treatment of stormwater, experience with vortex combined sewer overflow structures and their applications in combination with other treatment devices, real time control of sewer system operation, advances in hydroinformatics leading to improvements in the integrated management and modelling of drainage systems, interfacing of drainage models with geographic information systems, and improved regulation of drainage effluents.

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Results of an urban runoff monitoring program are presented. Combined sewer overflow (CSO) samples were analysed for suspended solids (SS), five-day biochemical oxygen demand (BOD5), total chemical oxygen demand (COD), total organic carbon (TOC), heavy metals (Cu, Zn, Cd, Pb, Ni), nitrogen compounds, biological and microbiological constituents. Study results indicate that CSOs largely contribute to the organic pollution of the local receiving streams. Cumulative pollution impacts were caused by sedimentation of suspended solids in the waste water treatment plant effluent discharged throughout the year. However, comparison of the various pollution sources indicated that pollution problems in the receiving waters were caused not only by the municipal effluents from the Town of Malacky, but also by diffuse, agricultural pollution characterised by elevated loads of nutrients (N and P), as well as by release of heavy metals (mainly Zn) from the surrounding area.

No abstract