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dc.contributor.authorGaut, Sylvinb_NO
dc.date.accessioned2014-12-19T11:24:58Z
dc.date.available2014-12-19T11:24:58Z
dc.date.created2005-12-02nb_NO
dc.date.issued2005nb_NO
dc.identifier125784nb_NO
dc.identifier.isbn82-471-7075-2nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/231276
dc.description.abstractGaut, S., 2005: Factors influencing microbiological quality of groundwater from potable water supply wells in Norwegian crystalline bedrock aquifers. Doktor Ingeniør thesis 2005:99. Department of Geology and Mineral Resources Engineering, NTNU, 153 pp and appendices. Microbiological analyses from 195 Norwegian waterworks based on groundwater in bedrock have been examined to study the vulnerability of bedrock wells to microbiological contamination. Inspections have been carried out at 49 of the 195 waterworks to identify possible causes to the recorded microbiological contamination. It is found that groundwater derived from bedrock wells is susceptible to microbiological contamination and needs better protection. Seasonal variations in the water quality occur. Coliforms are mostly detected from June to September. Cryptosporidium, but not Giardia, is detected in the groundwater from three of twenty waterworks. The microbiological water quality is correlated to (i) wellhead completion (including the well casing), (ii) type and thickness of superficial deposits, (iii) land use and contamination sources and (iv) distance from wells to running water. Recommended wellhead completion includes a well-house and a casing of at least 5.5 m, rising 40-50 cm above ground. The gap between casing and bedrock should be sealed. Wells are least vulnerable to microbiological contamination when the superficial deposits are > 2.5 m thick and the wells are located > 100 m from farmland and not within 75-125 m of running water. Variations in parameters, such as colour, turbidity, and iron, and high levels of total organic carbon can indicate that the aquifer or the well is vulnerable to microbiological contamination. Vulnerability mapping combined with a hygienic evaluation of the well area and delineation of protection zones based on simple analytical methods is suggested as a method to protect Norwegian bedrock wells.nb_NO
dc.languageengnb_NO
dc.publisherFakultet for ingeniørvitenskap og teknologinb_NO
dc.relation.ispartofseriesDoktoravhandlinger ved NTNU, 1503-8181; 2005:99nb_NO
dc.relation.haspartGaut, S; Storrø, G; Brattli, B. Bacterial contamination in Norwegian groundwater wells in bedrock. Groundwater: Past Achievements and Future Challenges - Proceedings of the XXXth IAH Congress, 26th November-1st December, Cape Town, South Africa: 751-754, 2000.nb_NO
dc.relation.haspartGaut, S; Brattli, B; Storrø, G. Factors influencing bacteriological quality of groundwater in Norwegian bedrock wells. Proceedings of the International Conference on Groundwater in Fractured Rocks - 15-19. September 2003, Prague, Czech Republic. IHP-VI, Series on groundwater No. 7: 341-342, 2003.nb_NO
dc.relation.haspartSabir, IH; Torgersen, J; Gaut, S; Haldorsen, S; Aleström, P; Colleuille, H; Pedersen, TS; Kitterød, NO. Synthetic DNA tracers: examples of application in water related studies.. Tracers and Modelling in Hydrogeology - Proceedings of TraM'2000, International Conference on Tracers and Modelling in Hydrogeology, IAHS Publication no. 262: 159-165, 2000.nb_NO
dc.subjectGeologi og bergteknikkno_NO
dc.subjectgrunnvannno_NO
dc.subjectmikrobiologino_NO
dc.titleFactors Influencing Microbiological Quality of Groundwater from Potable Water Supply Wells in Norwegian Crystalline Bedrock Aquifersnb_NO
dc.typeDoctoral thesisnb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologinb_NO
dc.description.degreedr.ing.nb_NO
dc.description.degreedr.ing.en_GB


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