LID-Bioswale DSD Parking Lot

Green Stormwater Infrastructure (GSI)

Residents, schools, and businesses of the San Antonio River Basin are using nature based solutions to slow and filter excess rainwater to reduce flooding and improve water quality in our streams and rivers. The San Antonio River Basin Green Stormwater Infrastructure map provides a place to share Green Stormwater Infrastructure projects funded by the San Antonio River Authority, access resources and learn how you can participate. All projects are built using methods and materials according to the San Antonio River Basin Low Impact Development Technical Design Guidance Manual.

Together, we are all making a difference.

The Green Stormwater Infrastructure map includes completed projects within the San Antonio River Authority four county jurisdiction. 

Green Stormwater Infrastructure Legend

Treated Stormwater is water runoff that is detained and/or filtered by green infrastructure to remove pollutants including sediment and bacteria. Treated Stormwater volume is measured in cubic feet (1cubic foot = 7.5 gallons).

Bioretention are depressed areas that slow stormwater which reduces local flooding. These areas also filter stormwater removing some pollutants including sediment and bacteria. Filtered stormwater makes streams and rivers healthy for plants and animals.

Bioswales are vegetated drainage paths which soak up and filter stormwater runoff from roofs or pavement. Bioswales are constructed with quick-draining soil and drainage layers to filter stormwater and provide water for plants.
Cisterns are storage containers that detain stormwater which reduces local flooding. Cisterns also allow the captured stormwater to be slowly released to porous planted areas where plants and soils are able to filter out the pollutants and clean the water before it reaches the river.
Permeable Pavement provides a load bearing porous surface over a storage layer. Permeable pavement reduces volume and delays stormwater runoff which reduce local flooding. Permeable pavement also removes sediment and bacteria making river water clear and healthy for plants and animals

Sediment are fine particles suspended in stormwater. Sediment from stormwater makes streams and rivers appear cloudy which affects the health of all river plants and animals. Other pollutants such as nutrients, metals and bacteria attach to sediment and are deposited at the bottom where they can harm plants and animals.

Bacteria measures fecal coliform bacteria which is measured in number of colonies. Fecal coliform is used as an indicator of contamination with other pathogens which cause disease in humans. When bacterial levels are high, human contact can result in sickness. Reducing bacteria makes the river safe for contact activities.