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Select surge, also known as surge stone, open-graded aggregate, drainage surge, or coarse drainage rock, is a clean, heavy-duty aggregate designed for high-flow drainage, erosion control, and stormwater management. It is made up of larger angular stone with little to no fines, creating open spaces that allow water to move freely through the material.
Its coarse, fractured pieces interlock to provide stability while helping reduce washouts, channel erosion, and soil movement in areas exposed to concentrated runoff. The open-graded structure supports dependable water flow and helps prevent the material from sealing over like dense-graded base stone.
Select surge is widely used in residential, commercial, agricultural, and municipal projects that require durable drainage performance and long-term erosion protection. It performs especially well around culverts, outfalls, underdrains, swales, and stormwater systems where high volumes of water must be managed efficiently.
Common Applications of Select Surge
- Drainage swales and stormwater management areas
- Culvert inlet and outlet protection
- Underdrain systems and subsurface drainage
- Erosion-control zones with heavy runoff
- Drainage channels and roadside ditches
- Slope and embankment stabilization
- Construction-site runoff protection
- High-flow drainage beneath larger structures
