Overflow from combined systems constitute an increasing source of pollution of receiving waters, as compared to daily wastewater discharges which undergo treatment to a still higher extent. The receiving water problems from overflows are significant both in a long term scale (mean annual load) and in a short term scale (extreme event load). A method for computation of both annual and extreme load is presented. It is based on historical rain series and the use of a time-area model and simple pollutant mixing model in runoff calculation. Statistical calculations for both mean annual load and extreme events have been applied to the computed overflow series. Based on the computerized method simple manual calculations methods have been developed, resulting in graphs and tables for annual load and extreme load.
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August 01 1984
Methods for Calculation of Annual and Extreme Overflow Events from Combined Sewer Systems
Water Sci Technol (1984) 16 (8-9): 311-325.
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N B Johansen, P Harremoës, M Jensen; Methods for Calculation of Annual and Extreme Overflow Events from Combined Sewer Systems. Water Sci Technol 1 August 1984; 16 (8-9): 311–325. doi: https://doi.org/10.2166/wst.1984.0200
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N B Johansen, P Harremoës, M Jensen; Methods for Calculation of Annual and Extreme Overflow Events from Combined Sewer Systems. Water Sci Technol 1 August 1984; 16 (8-9): 311–325. doi: https://doi.org/10.2166/wst.1984.0200
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