Step 1 of 5 — Site Characterization
Site Identification
Low <1500
Medium 1500–2500
High >2500
Lithology & Slope Material
🟤 Soil slope
⛰ Rock slope
Soil Characterization
Rock Mass Characterization
Structural Assessment
Step 2 of 5 — Taylor Slope Stability
Taylor (1937) Stability Analysis
Iterative FoS · Sn = c/(F·γ·H) · DoR RMDP Annex B7.3
Stability Numbers & Factor of Safety
🏔 Natural slope (β)
—
FS
—
✂ Proposed cut (α)
—
FS
—
Step 3 of 5 — Retaining Wall Design
✅ Retaining wall not required
FS from Step 2 does not require a wall. Proceed to bioengineering.
Prescriptive Toe Wall — Marginally Stable
FS 1.1–1.3 · Dry stone / banded masonry · no Rankine analysis
Wall Type & Foundation
Wall type
Dry Stone
γ18 · top 0.6–1.0
Banded Stone
γ19 · top 0.6–1.0
Cement (1:4)
γ23 · top 0.5–1.0
Gabion
γ17 · top 1.0–2.0
Leave blank to use full H. Free cut h = H − Hw above wall.
Auto-calculated: h = H − Hw
Auto: max(0.5+Hw/10+Hw/36, 0.6·Hw). Enter to override for redesign.
Default from wall type. Enter to override.
Rankine Wall — Results & Checks
Step 4 of 5 — Bioengineering
Slope Type for Bioengineering
Select whether you are treating the cut slope or the fill slope
✂ Cut Slope (uphill side of road)
🏔 Fill Slope (downhill / embankment side)
Cut Slope — Bioengineering Parameters
Slope angle carried from stability analysis; enter additional data below
Cut slope angle α 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(α)
Surface / rill erosion
Slumping / shallow sliding
Planar sliding / shear failure
Debris fall / rockfall
Gully erosion (≤45°)
Loose sand surface
Rato mato (red clay)
Base of slope — planar sliding
Rocky material (>30°)
None
Fill Slope — Bioengineering Parameters
Enter fill slope geometry and conditions below
Fill slopes (embankment / downhill side) allow brush layering. If fill slope length > 5 m, a 1.0–1.5 m dry stone toe wall is recommended for toe protection.
Surface / rill erosion
Slumping / shallow sliding
Planar sliding / shear failure
Gully erosion (≤45°)
Rato mato (red clay)
Base of slope — planar sliding
None
Bioengineering Recommendation
🌱 Recommended Species
📅 Planting Season
References: Nature-Based Solutions for Roadside Slope Stabilization for Bagmati Province (2083).
Step 5 of 5 — Drainage Design
Catchment Area
Google Earth ridgeline delineation
Field method: Enable Terrain → 3D view → trace ridgelines with Add Polygon → 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 = — |
Time of Concentration & Intensity
Kirpich: tc = 0.0195 × L^1.155 / H^0.385 (min)