Step 1 of 5 β Site Characterization
Site Identification
Low <1500
Medium 1500β2500
High >2500
Lithology & Slope Material
π€ Soil slope
β° Rock slope
Soil Characterization
Rock Mass Characterization
Structural Assessment
Step 2 of 5 β Taylor Slope Stability
Taylor (1937) Stability Analysis
Iterative FoS Β· Sn = c/(FΒ·Ξ³Β·H) Β· DoR RMDP Annex B7.3
Stability Numbers & Factor of Safety
π Natural slope (Ξ²)
β
FS
β
β Proposed cut (Ξ±)
β
FS
β
Step 3 of 5 β Retaining Wall Design
β
Retaining wall not required
FS from Step 2 does not require a wall. Proceed to bioengineering.
Prescriptive Toe Wall β Marginally Stable
FS 1.1β1.3 Β· Dry stone / banded masonry Β· no Rankine analysis
Wall Type & Foundation
Wall type
Dry Stone
Ξ³18 ΞΌ0.65
Banded Stone
Ξ³19 ΞΌ0.65
Cement (1:4)
Ξ³23 ΞΌ0.55
Gabion
Ξ³17 ΞΌ0.50
Leave blank to use full H. Free cut h = H β Hw above wall.
Auto-calculated: h = H β Hw
Auto: max(0.5+Hw/10+Hw/36, 0.6Β·Hw). Enter to override for redesign.
Rankine Wall β Results & Checks
Step 4 of 5 β Bioengineering
Slope Type for Bioengineering
Select whether you are treating the cut slope or the fill slope
β Cut Slope (uphill side of road)
π Fill Slope (downhill / embankment side)
Cut Slope β Bioengineering Parameters
Slope angle carried from stability analysis; enter additional data below
Cut slope angle Ξ± and height from Step 1. If wall built, free cut h is used. Palisades substitute brush layers automatically.
h if wall, else H
H_eff/cos(Ξ±)
Surface / rill erosion
Slumping / shallow sliding
Planar sliding / shear failure
Debris fall / rockfall
Gully erosion (β€45Β°)
Loose sand surface
Rato mato (red clay)
Base of slope β planar sliding
Rocky material (>30Β°)
None
Fill Slope β Bioengineering Parameters
Enter fill slope geometry and conditions below
Fill slopes (embankment / downhill side) allow brush layering. If fill slope length > 5 m, a 1.0β1.5 m dry stone toe wall is recommended for toe protection.
Surface / rill erosion
Slumping / shallow sliding
Planar sliding / shear failure
Gully erosion (β€45Β°)
Rato mato (red clay)
Base of slope β planar sliding
None
Bioengineering Recommendation
π± Recommended Species
π
Planting Season
References: Nature-Based Solutions for Roadside Slope Stabilization for Bagmati Province (2083).
Step 5 of 5 β Drainage Design
Catchment Area
Google Earth ridgeline delineation
Field method: Enable Terrain β 3D view β trace ridgelines with Add Polygon β verify downslope flow to drain inlet via Elevation Profile.
Weighted Runoff Coefficient
Enter % area per land-use; total must = 100%
| Surface / Land Use | % Area | Contribution |
|---|---|---|
| TOTAL | 0 % | C_w = β |
Time of Concentration & Intensity
Kirpich: tc = 0.0195 Γ L^1.155 / H^0.385 (min)