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Rock Chute Mike Cox State Conservation Engineer

Rock Chute Mike Cox State Conservation Engineer. Contractor Certification Training March 2008. Grade Stabilization Structure (410). Purpose: Stabilize the grade and control erosion in channels. Prevent the formation or advance of gullies.

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Rock Chute Mike Cox State Conservation Engineer

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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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