1. 1 BACKGROUND The Grunnvåg waterworks is a water supply system is a on the Island Senja in Troms in northern Norway. The system supplies 8, 1 home and 1 farm. The farm has plans for some tourist lodging. The source is a natural spring and a small dam is built to hold the water and act as a reservoir during periods of high consumption. The waterworks was constructed in 1951. At that time the requirements regarding hygienic safety barriers were not as strict as today. The spring itself provides high quality water, but the dam is liable to contamination. In order to meet current requirements of two hygienic barrieres the waterworks needs upgrading. This is also needed for the water to be certified for use by local tourist facilities. TASKS What are the main threats to the water quality of the exisiting design? What changes would you suggest in order to upgrade the well design so that it meets current requirements? Make a schematic drawing of how you suggest to upgrade the design of the reservoir and water intake. You find more information on the following slides NORWEGIAN UNIVERSITY OF LIFE SCIENCES www.umb.no 1 Department of Plant and Environmental Sciences, P.D. Jenssen THT282 Exercise E1. Well design – Grunnvåg waterworks Grunnvåg waterworks Norway

2. 2 NORWEGIAN UNIVERSITY OF LIFE SCIENCES www.umb.no 5 Department of Plant and Environmental Sciences, P.D. Jenssen Intake pipeOverflow Area of emerging water Grunnvåg waterworks The open reservoir at the source For more information on the reservoir size click here

3. 3 NORWEGIAN UNIVERSITY OF LIFE SCIENCES www.umb.no THT282 Exercise E1. Well design – Grunnvåg waterworks Topographic map with drilled wells in rock (blue dots) and the source for Grunnvåg waterworks (blue star) 8 Department of Plant and Environmental Sciences, P.D. Jenssen The source of Grunnvåg waterworks

4. 4 NORWEGIAN UNIVERSITY OF LIFE SCIENCES www.umb.no 3 Department of Plant and Environmental Sciences, P.D. Jenssen THT282 Exercise E1. Well design – Grunnvåg waterworks Topographic map with existing network (red lines) The source of Grunnvåg waterworks

5. 5 NORWEGIAN UNIVERSITY OF LIFE SCIENCES www.umb.no 6 Department of Plant and Environmental Sciences, P.D. Jenssen THT282 Exercise E1. Well design – Grunnvåg waterworks The open reservoir at the source Overflow

6. 6 NORWEGIAN UNIVERSITY OF LIFE SCIENCES www.umb.no 7 Department of Plant and Environmental Sciences, P.D. Jenssen THT282 Exercise E1. Well design – Grunnvåg waterworks The intake pipe

7. 7 NORWEGIAN UNIVERSITY OF LIFE SCIENCES www.umb.no 7 Department of Plant and Environmental Sciences, P.D. Jenssen THT282 Exercise E1. Well design – Grunnvåg waterworks Further information and reading material BRIKKE, F.; BREDERO, M. (2003): Linking Technology Choice with Operation and Maintenance in the context of community water supply and sanitation. A reference Document for Planners and Project Staff. Geneva: World Health Organization and IRC Water and Sanitation Centre. URL [Accessed: 30.03.2010]Linking Technology Choice with Operation and Maintenance in the context of community water supply and sanitation. A reference Document for Planners and Project Staff Grunnvåg waterworks – current reservoir; LJ/PDJ