LST P122 Risk local impact water contiguous settlement — GIS support for small sewers

Areas within 100 m from recipient with many houses located close to each other risk affecting a recipient locally, Table 5. The more houses, the higher the risk. Continuous settlements for phosphorus and nitrogen maps are defined as at least 20 address points with a maximum of 100 m between points. 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.