ABSTRACT
Detrimental effect of nonpoint (NP) discharge from urban areas on Biolochemical Oxygen Demand (BOD) and Dissolved Oxygen (DO) of streams and water bodies was evaluated by a mathematical model on the basis of field data and computerized prognostic calculations. Various situations were analysed at different combinations of geomorphologie characteristics of water bodies and different dimensions of populated areas. As a result there were defined water bodies needing urgent protection against pollution from urban NP discharge. Analysis of economic indices of traditional methods of urban stormwater treatment, on special treatment units with stormwater discharge systems, demonstrated high cost of such measures, especially if expressed in units of mass of removed pollutants. This led to a conclusion that it is impossible to solve the problem in the near future along these lines only.
