Wetland 1 would be located approximately 830 meters North from Västankvarn’s management offices, in a field that is partially flooded throughout the year. This area receives nutrient rich waters from two different ditches, providing the perfect conditions to build a wetland that has a constant “natural” water input throughout the year. Below you can see an overview of Västankvarn area and marked with the color yellow, you can observe the catchment area that will surround the construction of Wetland1. The approximate total area of the catchment era of this wetland is of 1300 hectares.
The construction of this wetland is not only providing for a good system to capture runoff nutrients, but also provides our project with the opportunity to improve the soil quality in the neighboring area (marked with different shades of blue in the image below) located east to the wetland. We intend to do this by using the soil (approximately 6800 cubic meters) that we would dig out during the construction of Wetland 1 to increase the soil level/altitude of the neighboring area located east to the wetland. This would prevent it from flooding and could provide the farm with approximately 8200 extra square meters of un-flooded soil which they will be able to use for any agricultural purposes that the farm esteems convenient. This can provide a “win/win” situation for the environment and the farm stakeholders.
The excavation perimeter of the wetland is marked with yellow in the image below. The water surface of the wetland will have an approximate area of 8250 square meters. The submerged bottom contours (represented by the green contours shifting to dark purple) and depths of the wetland are specifically designed to ensure the biodiversity of aquatic plants and maximize the capture of nutrients. Looked from above, the end product looks like a “nutrient digestive system” with constant variations in depth and shape, which greatly increase the surface area of the wetland. This shape will also channel the nutrient rich water flows in different directions to increase the rates at which nutrients can be absorbed by the different organisms living in the wetland, or settle in the wetland’s bottom in the form of sludge.
In the image here under, you can distinguish the partially flooded areas located at the adjacent terrain to Wetland1. Marked with different shades of blue, the darker areas represent the parts that are most susceptible to be flooded.