Riprap for Erosion Control: When and Where to Use It

Riprap isn't the right fix for every erosion problem. Here's when it makes sense and when another method is a better fit.

Riprap gets specified often, but it's not automatically the right answer everywhere. Knowing when it fits, and when it doesn't, is part of designing a site that actually holds up.

When Riprap Is the Right Call

Concentrated flow areas like culvert outlets and ditch bends

Slopes exposed to wave action or fast-moving water

Areas where vegetation alone can't establish before erosion starts

When Another Method Might Fit Better

Situation Better Fit
Gentle slopes with time to establish Erosion control matting or vegetation
Temporary construction-phase protection Silt fence or sediment barriers
Aesthetic or landscaped areas Engineered turf reinforcement mats

Sizing Matters as Much as Placement

Undersized riprap simply washes out during the next heavy rain. Sizing is driven by expected flow velocity, and getting it wrong defeats the purpose of installing it at all.

Frequently Asked Questions

Can riprap be combined with other erosion methods?

Often yes, riprap at high-flow points combined with vegetation or matting on gentler slopes is common.

How do I know if my existing erosion control is failing?

Visible soil movement, undercut banks, or sediment buildup downstream are all signs worth a site evaluation.

The Bottom Line

The right erosion control method depends on the specific flow conditions at each point on your site, not a one-size-fits-all default.

Related Reading

Foshee Construction home

Foshee Construction blog

U.S. Environmental Protection Agency

USDA Natural Resources Conservation Service

Florida Department of Environmental Protection

U.S. Army Corps of Engineers

Florida Department of Transportation

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In 2024, Foshee Construction was acquired by Saga Infrastructure Solutions, a national network of civil construction companies. Saga supports regional contractors by giving them access to better tools, long-term resources, and operational backing, without changing how they run day to day.
Foshee will continue to operate under its name, with the same team and field leadership in place.

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— Don, CEO, Saga Infrastructure Solutions

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