rock chute mike cox state conservation engineer contractor certification training march 2008
TRANSCRIPT
![Page 1: Rock Chute Mike Cox State Conservation Engineer Contractor Certification Training March 2008](https://reader036.vdocuments.net/reader036/viewer/2022062516/56649dd35503460f94ac9f24/html5/thumbnails/1.jpg)
Rock Chute
Mike CoxState Conservation Engineer
Contractor Certification
Training
March 2008
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Purpose: Stabilize the grade and control erosion in channels. Prevent the formation or advance of gullies.
Grade Stabilization Structure (410)
Rock Chutes are commonly used to
control grade in Indiana
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Rock Chute-Advantages
• Most of the construction can be done with a backhoe or excavator
• Economical compared with poured concrete
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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
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Rock Size vs Velocity
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What is a d50?
• Expressed as D50 size (50% maximum passing by weight)
RIPRAP GRADATION
d50 = 7 INCHES
SIZE % PASSING
14 100%
7 50%
2.3333 15%
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Example:p1 = 24”
p2 = 19.2”
D50 = (24” + 19.2”)/8
= 5.4 inches
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Bedding
• Minimum Thickness = 6”• INDOT Sizes Specified
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Geotextile
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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.
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Installation Report
http://www.in.nrcs.usda.gov/technical/engineering/engineering.html
Landowner:Rock Chute Number or Location:TBM # and description:TBM Elev: TBM reading: HI:
I certify that I have constructed the Rock Chute in accordance with this report and the NRCS plans and specifications.Contractor: Signature: Date:
(print name)
ROCK CHUTE CONSTRUCTION CHECKOUT SHEET
Rock size:
SURVEY
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Construction Tolerances-Rock Chute
Depth at Centerline: Grade to 0.1 foot below
Width: 10% wider not to exceed 1.0 foot
Top of Levee: Grade or above
Side Slopes: +0.1 ft./ft.
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Helping People Help the Land