by Christian Nilsen
The Stormwater Heatmap team is excited to share a major development milestone!
The mapping tool, which models where stormwater pollution is generated across the landscape, has a newly revamped impervious data layer. Impervious surfaces are areas where rainfall is unable to soak through the ground and includes hard surfaces such as roads, sidewalks, and roofs. This results in toxic contaminants washing from these surfaces into waterways, making stormwater the leading cause of toxic pollutants in Puget Sound.