| 1. |
- Berndtsson, R., et al.
(author)
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Aspects of computer modelling techniques for a semi-arid, small catchment in Tunisia.
- 1986
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In: Urban drainage modelling : proceedings of the Internat. Symposium on Comparison of Urban Drainage Models with Real Catchment Data, UDM '86, Dubrovnik, Yugoslavia, 8 - 11 April 1986 - proceedings of the Internat. Symposium on Comparison of Urban Drainage Models with Real Catchment Data, UDM '86, Dubrovnik, Yugoslavia, 8 - 11 April 1986. - 0080325580 ; , s. 285-291
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Conference paper (peer-reviewed)abstract
- Addresses the issue whether computer modelling techniques developed for humid climates are applicable in runoff forecasting in the semi-arid zone. Four different simulation models were applied to a partly urbanized catchment in northern Tunisia. Two of the models used were developed for urban runoff simulation (SWMM and ILLUDAS) and two for typical rural application (HBV and VANMOD). -Authors
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| 2. |
- Berndtsson, R., et al.
(author)
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The effects of storm water on Lake Vaxjosjon
- 1989
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In: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 45:2, s. 167-173
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Journal article (other academic/artistic)abstract
- The aim of the present study was to determine the pollution load originating from storm water on Lake Vaxjosjon. Each year about 1,050,000 m3 of storm water are discharged into the lake. Storm water represents a substantial pollution source for the lake and therefore also a main reason for the hypertrophic conditions in the lake. In order to evaluate the effects of the discharged storm water on the ecological conditions in the lake, an investigation was carried out using available information on storm water quality together with complementary sampling and flow measurements. Two different time scales were considered to be important: a short time scale for evaluating effects on the receiving waters due to shock loads of toxic substances (hours and days) and a long time scale for evaluating the effects of nutrients (years). In order to investigate effects concerning the short time scale, a computer-based runoff model was used. For the long time scale a daily precipitation series from 1970 to 1983 was used. The results showed that approximately 37% of the annual load of total phosphorus and 70% of the annual load of total nitrogen originate from storm water. Also a considerable portion of the annual heavy metal load originates from storm water (zink 51%, copper 55%). The annual total phosphorus load on Lake Vaxjosjon is 0.63 g/m2 lake area and year. The storm water part represents a phosphorus load equal to 0.23 g/m2 lake area and year. The acceptable load of phosphorus, for mesotrophic conditions in the lake, is about 0.2 g/m2 lake area and year. In order to improve the water quality in Lake Vaxjosjon sediment dredging of the bottom sediments needs to be undertaken. The sediments consists of an organic rich, phosphorus and nitrogen accumulated, black, anaerobic deposit, causing internal nutrient loading during summer periods.
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| 3. |
- Hogland, W., et al.
(author)
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Calculation of mass transport of pollutants via storm water discharge
- 1986
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In: VATTEN. - 0042-2886. ; 42:1, s. 16-20
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Journal article (peer-reviewed)abstract
- The National Swedish Environmental Protection Board recommends a standard value method for calculation of mass transport of pollutants via storm water sewer systems. In this paper mass transport calculations based on this method are compared with actual measurements. Measurements during one and a half years in the city of Lund show high amounts of leakage and drainage into the storm water sewer system. The paper shows that the pollution transport during base flow conditions is significant.
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