New groundwater source, Jämtön-Råneå
Desire for simpler treatment for satisfactory drinking water quality.
The water supply for the community of Råneå is currently based on surface water from Lake Andträsket. There is a desire to replace this water with water that is easier to treat to produce satisfactory drinking water quality. Using other solutions, the handling of chemicals and energy consumption can be reduced in the waterworks.
On behalf of Luleå Municipality, ÅF has investigated the possibilities of a new water source for Råneå, based on groundwater, in connection with the existing water source at Jämtön.
The questions to be highlighted were:
- Can extraction from the water source at Jämtön be increased so much that it can also supply the community of Råneå with groundwater?
- Can the good quality of water be maintained or will it be worse if more water is taken?
- How is the surrounding area affected by this increased extraction, e.g. private wells?
The assignment involved a hydrogeological survey being conducted in a number of stages. Test drillings were carried out in order to map out the area’s geology, groundwater levels, directions of flow and dwell times. An extraction well was created. Test pumping then took place in order to assess the water source’s capacity and water quality. Based on the results, an assessment was made of the possibility of replacing Råneå’s surface water source with groundwater from Jämtön. Base data was also produced for the design of a water catchment protection area.