The problem of reducing the negative impact of rainfall sewage on ground and water environment has been the subject of research and scientific papers for many years. It becomes more and more frequently an inherent part of planning and projects of sewer systems in the anthropologically transformed areas. Non-point sources of pollution are one of the main causes of water quality degradation. Traffic and washing out the sediments deposited in sewer pipes have the most serious influence on pollutant contents in rainfall runoffs. Therefore, characterization of pollutants in rainfall sewage is necessary for preparing plans of water management in urbanized catchments. The article aims at an assessment of the sedimentation process effect on reduction of pollutants from rainfall sewage. Sewage samples for analyses were collected from the roadside ditches at Pułłanki street in Kraków-Bieżanów in April 2003 and February 2004 during surface runoff observations. After 120 minutes of sedimentation, the following pollution indices were determined in the collected raw sewage samples: BOD5, CODCr and total suspended solids, sporadically phosphates, whereas after 15, 30 and 60 minutes of sedimentation only total suspended solids and CODCr were assessed. The analyses revealed the usefulness of sedimentation process for pollutant reduction from rainfall sewage. ...
Living and industrial sewage is claimed to be the only source of the water pollution in urban areas. Therefore the regulation of sewage management – which is building or extension of sewerage systems - is considered to be the suffi-cient protection of the urban water resources. Urbanized areas, especially mu-nicipal – industrial agglomerations become huge sources of air, water, soil, streets, squares, roofs and non-built-up areas pollution. Pollutants washed down from the streets or other impregnated surfaces, during the precipitation or snow-melt, are the serious danger for the soil and water environment. The article reviews the obliging legal regulations concerning the drainage and management of the precipitation water from the urbanized areas. The main attention was paid to possibilities of the retention and infiltration of precipitation water – which is their management in the site where the precipitation originates. Moreover, the examples of created and exploited objects used for retention and infiltration together with the effects of pollutants’ reduction in the treated pre-cipitation water were presented. The basic legal documents concerning the man-agement possibilities and quality standards of precipitation water are the Water Law from 18th July 2001 and The Regulation of the Minister of Environment from 24th July ...
