What is Stormwater?
Stormwater runoff is rain that falls onto hardened surfaces, such as streets, roofs, and driveways, picks up pollutants that are on those surfaces, and carries the pollutants into the street storm drain system and on into our streams. Those pollutants include, but are not limited to, oil, fertilizers, bacteria, heavy metals, gasoline, and sediment. A great stormwater control measure in highly urbanized areas, such as San Antonio, is low impact development.
Did You Know? In San Antonio, stormwater does not drain into a sanitary sewer system. It flows directly into our creeks and rivers primarily from the street storm drain system.
What is Low Impact Development?
Low Impact Development (LID) is a sustainable land planning and engineering design approach that manages stormwater runoff as close as possible to where it falls as rain. Examples are rain gardens, stormwater harvesting cisterns, and permeable pavement.
Uses on-site natural features to drain the site and manage pollutants
- Maintains or enhances the site’s natural drainage flow paths after development
- Reduces impervious cover and/or disconnects impervious areas from the stormdrain/stream network.