Geoscience Reference
In-Depth Information
Steeper slopes are possible, than those indicated.
Minimum width for maintenance and feasible for construction with heavy
earthmoving equipments
=
3.0m.
14.16 Slopes for revetments
Revetments are require to protect the slope against erosion, and based on the type
of material may govern the slope design.
Safety aspects may also influence the slope angle, e.g. adjacent to recreational
water bodies.
Table 14.16 Slopes for different revetment materials (McConnell, 1998).
Revetment type
Optimum slope
Maximum slope
Rip - Rap
1V: 3H
1V: 2H to 1V: 5H
Rock armour
1V: 1.5H
Concrete blocks
1V: 2.0H
Concrete mattresses
1V: 1.5H
Asphalt - OSA on LSA filter layer
1V: 3H
1V: 2.0H
Asphalt - OSA on geotextile anchored at top
1V: 1.5H
Asphalt - Mastic grout
1V: 1.5H
OSA - Open Stone Asphalt is a narrowly graded stone precoated with an asphalt
mastic, typically 80% aggregate (20-40mm) and 20% mastic.
LSA - Lean sand asphalt typically 96% sand and 4% bitumen 100 pen.
Mastic Grout is a mixture of sand, filler and bitumen, typically 60% sand, 20%
filler and 20% bitumen 100 pen.
Figure 14.3 Freeboard requirements.
 
 
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