Lawn erosion happens when moving water carries soil away. You see channels, bare paths, exposed roots and soil piled at the bottom of slopes or on sidewalks.
Erosion gets worse with every storm. The channel it cuts gives the next storm an easier path.
What you may be seeing
- Channels or gullies in the lawn
- Bare strips where water flows
- Soil and mulch on sidewalks and driveways
- Exposed tree roots
- Rock or mulch washed out of beds
- Sediment at the bottom of slopes
First question: where is the water coming from that causes the erosion?
Follow the channel uphill. It usually leads to a downspout, the edge of a driveway, a neighbor's yard or a steep slope.
If erosion starts at a downspout or hard surface
Concentrated runoff is cutting the channel.
Possible causes:
- Downspout discharge
- Driveway or patio runoff
- Street or neighbor runoff
If erosion is on a slope
Water speeds up on slopes and strips soil.
Possible causes:
- Thin turf
- Steep grade
- Runoff from above
If erosion is in beds
Mulch and soil wash out of beds.
Possible causes:
- Beds in the flow path
- Irrigation runoff
- Downspouts into beds
What you can check yourself
Only check these safely and after rain has stopped. Do not dig near marked utilities, and do not go near electrical equipment that is standing in water.
- Trace the channel to its source
- Check downspout discharge points
- Check irrigation for runoff
- Note how much soil moves in each storm
Answer 20 quick questions → to get a preliminary drainage assessment.
What a drainage professional may evaluate
- Runoff source identification
- Grade and slope assessment
- Swale or dry creek design
- Soil stabilization plan
Most common causes
Concentrated runoff
Roof, driveway or neighbor water focused into a channel.
Slopes
Fast-moving water on bare or thin turf.
Irrigation runoff
Overspray and runoff on slopes.
Poor ground cover
Bare soil erodes easily.
Possible solutions
The right fix depends on where the water comes from, where it collects and where it can legally and physically go. These are the solutions most often considered:
Swale
Slows and redirects water across the yard.
Dry creek bed
A rock-lined channel that carries water without eroding.
Downspout drainage
Remove roof water from the problem area.
Surface drains
Collect water before it gains speed.
Stabilization
Turf, ground cover, erosion fabric or retaining structures.
When to call a drainage professional
- Erosion is near the foundation
- Channels are getting deeper
- Slopes are failing
- Neighbor or street runoff is involved
Frequently asked questions
How do I stop erosion in my yard?
Slow and redirect the water first, then cover and stabilize the soil. Planting grass alone usually fails while water still runs through the area.
Is a dry creek bed a drainage solution?
Yes. A properly built dry creek bed carries surface water and resists erosion.
Can erosion damage my foundation?
Erosion near the house can wash away the soil that supports the slab edge and slopes water away. Correct it promptly.
Bottom line
Erosion is water moving too fast in one place. Slow it, spread it or carry it away, then protect the soil.
This page is educational and does not replace an onsite evaluation. Conditions, codes and HOA rules vary by property.