Research Links
- Google: riprap on slope
- Google: riprap design
- Bioengineering/Riparian Restoration on Challenging Sites
- LOOSE RIPRAP PROTECTION Minnesota Technical Note 3 July 1989
- GravelShop: RipRap Calculator for 4-12"
Contact Notes
- Honey Creek Mine
- EFCC FAMILY Current Limestone Price List
- Bessemer Concrete LLC – (330) 366-0166 —> Used these guys.
Surge Stone / Large RailRoad type Gravel specifications
INFORMATION
- 16 USD per ton
- Density: 1 ton = 0.83 cu yd / 1 cu yd = 1.2 ton
- Coverage: 0.62 cu yd covers 100 sq ft 2 inch deep
- Coverage: 1.54 cu yd covers 100 sq ft 5 inch deep
- Estimator: Coverage Calculate Rip Rap 2" – 4" – Gabion/Surge Stone
Per Loose RipRap Protection Minnesota
G. Allowable Side Slopes. The stability of the riprap on the side slope of a channel
is dependent on the angularity of the rock. The more angular the rock, the higher the
angle of repose. The maximum (steepest) slope for riprap is recommended to be 2:1
(that is, two feet horizontally for every foot of vertical height). For small areas, such as
around existing culverts or transitions where slopes steeper than 2:1 cannot be avoided,
slopes up to 1:1 can be tolerated, provided the riprap thickness and size are increased.
Very angular rock must be used and carefully installed. The thickness shall be
increased by 10% for 1.5:1 side slopes and by 20% for 1:1 side slopes. The minimum
D50 that can be used on slopes steeper than 2:1 is 4 inches. This must be angular rock,
not rounded.
———RipRap pile angle calculation————–
—From Slope foto #01—
x1,y1 = 1400,1600
x2,y2 = 4100,0
Slope = (1600-0) / 4100-1400 = 1600/2700 = 31 using bottom less sloped
x1,y1 = 3200,700
x2,y2 = 4100,0
Slope2 = 700 / 900 = 0.78 Absolute maximum slope of pile => 38 degrees
—From Slope foto #02—
x1,y1 = 2500,1300
x2,y2 = 4100,0
Slope1 = 1300 / 1600 = 0.81 Absolute maximum slope of pile => 39 degrees
—From Slope foto #03 & 4—
x1,y1 = 0,0
x2,y2 = 2900,1700
Slope1 = 1700 / 2900 = 0.58 Absolute maximum slope of pile => 30 degrees
Current Cut Slope = 3/4 = 0.75 => 37 degrees — Essentially at max slope here.
Modifying creek slope to 3/5 = 0.60 => 31 degrees => 1ft delta at top of cut
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