The Streams and Storm Drains data layer displays where natural streams and human-made storm drains are located in L.A. County.
The combined L.A. County stormwater system funnels water from natural streams in the mountains into human-made reservoirs, aboveground channels, and underground pipes. These are designed to prevent flooding and guide water to treatment facilities and downstream bodies of water, many of which remain polluted.
You can use this layer to identify existing stormwater inlets to alleviate flooding issues, determine where new inlets might be necessary, and track the path of stormwater through the drainage network. This information also allows you to determine where pollutants leaving your site may impact downstream areas.
When you add the Storm Drain data layer to the map, you will see the following sublayers:
- Streams
- Storm Drains (Mains)
- Storm Drains (Laterals)
- Inlets
- Flow animation
1. Streams
Feature
This sublayer displays natural streams as line features. This data is derived from the Safe Clean Water Program.
2. Storm Drains (Mains)
Feature
This sublayer displays storm drains, including aboveground canals and belowground main pipes, as line features. This data is derived from L.A. County Department of Public Works.
3. Storm Drains (Laterals)
Feature
This sublayer displays lateral pipes connecting buildings to mains. This data is derived from L.A. County Department of Public Works.
4. Inlets
Feature
This sublayer displays catch basins, or drain inlets with debris filters, as point features. This data is derived from L.A. County Department of Public Works.
5. Flow Animation
Feature
This sublayer animates the Streams and Storm Drains sublayers to show flow direction.
Related Data Layers
We recommend considering these related data layers when exploring your area.