Davis Lake along Mission Reach Paddling Trail

Stormwater Management and Low Impact Development

What is Stormwater?

Stormwater is rain that falls onto impervious cover, 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 (LID).

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 design approach that manages stormwater on site. Examples are rain gardens, stormwater harvesting cisterns, and permeable pavement.

LID design

  • Maintains or enhances on-site natural features to drain the site and manage pollutants after development

  • Reduce impervious cover and / or disconnect impervious areas from the storm drain / stream network.

Low impact development fact sheet

 

What can I do?

This table highlights some simple and easy solutions for helping protect the San Antonio River watershed.

Solution Benefit Example
Position gutter downspouts toward vegetated/grassy areas in your yard rather than toward impervious surfaces such as driveways.
  • Slows down stormwater
  • Filters contaminants
LID downspout
Pick up pet waste
  • Reduces harmful bacteria that can be carried from your yard to a stream or river via the street/storm drain system
LID Pet Waste
When mowing your yard, leave grass clippings in your grass, bag them up and place them in the trash, or compost the grass clippings. Do NOT blow them into the street or storm drains, which is prohibited by City ordinance.
  • Reduces pollutants, such as fertilizers, from reaching streams and rivers via the street/storm drain system
Lawn mower grass
Bag and dispose of or compost raked leaves. Do NOT blow them into the street or storm drains, which is prohibited by City ordinance.
  • Reduces pollutants, such as bacteria, from reaching streams and rivers via the street/storm drain system
Bagged leaves
When working on vehicles at home, properly dispose of automotive fluids. Do NOT let them fall onto the driveway, road, or other hardened surfaces.
  • Reduces contaminants, such as oils, from reaching streams and rivers via the street/storm drain system
Car oil draining
Build a rain garden to help capture and filter stormwater on your property.
  • Slows down stormwater
  • Filters pollutants
LID Rain Garden
Use permeable pavement on driveways or landscape projects.
  • Slows down stormwater
  • Filters pollutants
Permeable pavement
Harvest rainwater in a rain barrel and use that water to irrigate your yard.
  • Captures stormwater
  • Conserves potable water used to irrigate lawns
Rain barrels