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Bestämning av dagvattenflöden i Knivstaåns avrinningsområde
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2012 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Determination of stormwater flows in the Knivsta river drainage area (English)
Abstract [en]

The purpose of the thesis was to map the hydraulic load on the Knivsta river from stormwater runoff, and build a platform for further studies of pollution loads on the rivers ecosystems. New residential areas are planned to be built in Knivsta municipality and it will have an impact on stormwater flows to Knivsta river. To examine the impact this will have, simulations were made in the area as it stands today and after expansion work. The work includes calculation of flows from the populated areas but also from the catchment area around it consisting of woodlands and fields. Because of expected climatic changes which may affect rainfall, the simulations have been performed with different return periods for rainfall data. Return periods of 1, 2, 10 and 50 years were chosen to get a result that reflects the current situation but also a possible climate change that would give rise to much greater rainfall.Simulation results showed that stormwater runoff would increase by 11 percent if new residential areas were built in the drainage area. Return times of rain had profound implications for the amount of runoff. A 50-year rainfall generated 7.6 times as much stormwater runoff for 1 hour as a 1-year rainfall and the amount of flooded water increased significantly as more and more pipes were flooded.In the simulations no consideration was taken to water already present in the system, only to water which is supplied through the storm water runoff. To get a better picture of flood risk and flows in the pipe system, additional analyses of flows and cross-sectional area of Knivsta river and flowing ditches are required. An analysis of the pipeline system in the detailed plans for the new areas should be done when these plans are available. Without these detailed plans, it is difficult to determine how the newly built areas will affect the pipes and ditches in the vicinity that the water must pass on the way to the recipient.

Place, publisher, year, edition, pages
2012. , 64 p.
UPTEC W, ISSN 1401-5765 ; 12032
Keyword [sv]
Dagvatten, SWMM, avrinningsområde, AutoCAD, Knivstaån, Översvämningsrisker
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-193230OAI: oai:DiVA.org:uu-193230DiVA: diva2:601520
Educational program
Master Programme in Environmental and Water Engineering
Available from: 2013-03-05 Created: 2013-01-29 Last updated: 2013-03-05Bibliographically approved

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