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Rock Chute Installation Guide for Grade Stabilization Structures

Learn how to construct a rock chute for stabilizing grades and preventing erosion in channels with tips on rock size, bedding, and riprap thickness. This training resource covers advantages, disadvantages, and specifications. Visit the link for installation reports.

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Rock Chute Installation Guide for Grade Stabilization Structures

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  1. Rock Chute Mike Cox State Conservation Engineer Contractor Certification Training March 2008

  2. Grade Stabilization Structure (410) • Purpose: Stabilize the grade and control erosion in channels. Prevent the formation or advance of gullies. • Rock Chutes are commonly used to control grade in Indiana

  3. Rock Chute-Advantages • Most of the construction can be done with a backhoe or excavator • Economical compared with poured concrete

  4. Rock Chute - Disadvantages • Rock can move during large storms • Hard to find larger rock sizes in certain areas • High overfalls require long chutes • Small rock size increases width and length of chute

  5. Rock Size vs Velocity

  6. What is a d50? • Expressed as D50 size (50% maximum passing by weight)

  7. Example: p1 = 24” p2 = 19.2” D50 = (24” + 19.2”)/8 = 5.4 inches

  8. Bedding • Minimum Thickness = 6” • INDOT Sizes Specified

  9. Geotextile

  10. Riprap Thickness • Minimum of 1’ thickness • Must be 2 times D50 size • Example: • If using D50 Size = 7” Riprap • Minimum Riprap Thickness = 2 * 7” = 14” 2xD50 min.

  11. Installation Report http://www.in.nrcs.usda.gov/technical/engineering/engineering.html

  12. Helping People Help the Land

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