LST HS12 Risk impact surface water — GIS support for small sewers

The risk assessment for impacts on surface water (HS12) is based on whether areas within the water protection area for general surface water supply and/or near bathing areas and low retention potential are conditions that pose a high risk of impact. The purpose of the GIS support is to create conditions at a national level for a reasonable, legally certain and more consistent assessment of the level of protection under Chapter 2, Section 3 of the Environmental Code when examining small sewers. The GIS support consists of maps showing the risk of impact on recipient/exposure point due to load from a drain. The maps have been produced through risk assessments based on the legislator’s instructions on criteria for assessing the high/higher level of protection for the entire surface of Sweden.