Project Inputs
Choose geometry, then enter dimensions and material assumptions.
Example Data Table
| Scenario | Geometry | Key Inputs | Typical Output |
|---|---|---|---|
| Riverbank protection | Bank slope | 50 m length, 3 m height, 2H:1V, 0.30 m thick | Area ≈ 335 m², volume ≈ 106 m³ (before waste) |
| Apron at outfall | Plan area | 20 m × 5 m, 0.25 m thick, 5% waste | Volume ≈ 26 m³, mass depends on density |
| Drainage channel lining | Channel lining | 100 m length, 4 m bottom, 1.5 m depth, 2H:1V | Area ≈ 1030 m², volume ≈ 309 m³ (1 layer) |
Example outputs are approximate and depend on placement factor and waste.
Formula Used
- Plan area: A = L × W
- Bank slope length: S = H × √(1 + (Hratio)²)
- Bank area: A = ProtectedLength × S
- Channel side length: S = √(D² + (Hratio × D)²)
- Channel wetted perimeter: P = BottomWidth + 2 × S
- Channel area: A = P × ChannelLength
- Base volume: V = A × Thickness × Layers
- Placed volume: Vp = V × PlacementFactor
- Ordered volume: Vo = Vp × (1 + Waste%)
- Mass: M = Vo × Density
- Truckloads: N = M / TruckCapacity
Bulk density is used for ordering and trucking. Field compacted density can differ.
How to Use This Calculator
- Select the unit system used on your drawings.
- Pick the geometry that matches your protection area.
- Enter dimensions carefully, including side slopes when needed.
- Set thickness and layers based on project requirements.
- Confirm bulk density from the quarry or prior tickets.
- Use a placement factor to reflect loose placement or shaping loss.
- Add a realistic waste percentage for handling and overbuild.
- Click Calculate to view results above the form.
- Download CSV or PDF to attach to estimates and orders.
For critical works, validate against design guidance and site trials, and coordinate with supplier gradation and delivery constraints.