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Skyddsområde för Rörbäcks grundvattentäkt: Med Riskanalys och förslag på sekundärt skyddsområde
2011 (Swedish)Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
Abstract [en]

This thesis work was the final step in the Samhällsbyggnadsprogrammet 120 hp at LTU. It was produced as part of the Environmental Management course for the Department of Technical Supply in Kalix Municipality, Norrbotten. Aim of the thesis is to examine the risks of pollution from private sewages which unfortunately often provide inadequate filtering of waste water, compared to municipal water and wastewater systems. The area in question lies in Rörbäck, northeast of Luleå. Kalix municipality is the responsible authority of drinking water in the area, but Luleå municipality owns the land not covered by the water pit and groundwater well area. Stricter rules of the EU Water Framework Directive have created a need to develop procedures for maintaining secure water quality and eliminate potential risks associated with water contamination. Previous to this work, a survey has been sent to property owners to inquire about their individual sewage systems in order to gain an understanding of the present situation. This thesis consists essentially of two parts. The first discusses and analyzes the probability of infiltration in the soil in the area based on topographic, geological and geo-hydrological information, and the second is an analysis of general contaminant risks. Also an estimate of the well area boundaries is provided, calculated according to standards set by the Protection Agency as stated in the agency manuals (2003:6). Topographical maps with elevation lines have been used to determine the slope and likely catchment area of aquifers, based on the variation in the terrain in the ground and its gradient. Geological soil maps, together with geo-hydrological map information, were used to assess the probable extent of soil infiltration and location of the topography. The second part consists of a general risk analysis, which includes activities in the Rörbäck area and associated risk sources. The risk analysis examines the individual sewage treatment placements and their potential impact of pollution on the groundwater. The analysis showed that placements with timber-cutting gave a high score in the risk analysis, because the level of protective soil layer is reduced creating less protection and resistance to pollution. Certain sewage facilities also gave high marks, especially those located near the well area vicinity with infiltration directly into the soil and thus connected to the groundwater. Such things as car- wash detergents can easily penetrate the soil layer, especially in coarse-grained soils where factors as permeability and hydraulic conductivity is of a great influence for the process To get a better understanding of permeability in different soils and knowledge of individual sewage risks and risk management, a literature review was conducted. Also contact with the municipality of Luleå, the Geological Survey of Sweden and SMHI was made. Several field visits were made in the Rörbäck area, however due to harsh winter conditions a detailed localization of the sludge wells in the area was not possible. This is an area worth following up on in future investigations.

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
Teknik, vattentäkt, grundvatten, skyddsömråde, riskanalys
URN: urn:nbn:se:ltu:diva-54066Local ID: b0a2184f-b16e-441b-94c2-7d18cdd63051OAI: diva2:1027445
Subject / course
Student thesis, at least 7,5 credits
Educational program
Built Environment, Higher Education Diploma
Validerat; 20111116 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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