Turn field observations into an actionable risk score. Compare scenarios, record assumptions, share results fast. Make smarter landscape decisions before crews break ground today.
Meta description (25 words): Score slope, drainage, soil, and exposure quickly here. See likelihood, impact, and overall risk in minutes. Reduce surprises by documenting controls and monitoring site conditions.
| Scenario | Key conditions | Typical category | Common controls |
|---|---|---|---|
| Residential grading | 8% slope, fair drainage, 35% cover, medium exposure | Moderate | Silt fence, inlet protection, stabilized exits |
| Steep cut near buildings | 22% slope, poor drainage, 10 m to structures | High | Benching, retaining, dewatering, monitoring |
| Work near sensitive creek | 12% slope, 30 m to water, high sensitivity | High | Buffer zones, turbidity checks, rapid stabilization |
This calculator builds a hazard level from five subscores: slope, rain intensity, low vegetation cover, proximity to structures, and proximity to water.
The model is for planning and comparison. Validate with site investigations and local requirements.
Landscape risks on construction sites often emerge where earthworks meet people, assets, and drainage pathways. The purpose of this calculator is to create a consistent, auditable way to screen risks early, before crews mobilize and before minor issues become costly incidents. It supports quick scenario comparison during planning, tender clarifications, and method statement development. It also helps align subcontractors on inspection routines, control ownership, and evidence collection for compliance, claims, and post-incident learning across the project lifecycle.
The hazard component aggregates slope, rainfall intensity, vegetation loss, proximity to structures, and proximity to water. Soil type and drainage condition act as multipliers because erodibility and infiltration control how runoff forms and how easily particles detach. Projects on made ground or silty soils can show elevated hazard even at moderate slopes, particularly when surfaces are left bare.
Likelihood is entered as a 1–5 rating and is adjusted by the calculated hazard, reflecting that severe site conditions increase the probability of failure. Impacts are scored across cost, schedule, safety, and environment, then weighted to match typical construction priorities. This structure encourages balanced decisions, so a low-cost event with high environmental exposure is still treated seriously.
Low and Moderate results typically indicate routine controls are adequate when installed correctly and maintained. High and Extreme results suggest the need for staged drainage, enhanced sediment protection, tighter inspection frequency, and stronger coordination with neighbors and authorities. When regulatory sensitivity is high or water is nearby, escalation should include documented monitoring triggers and clear stop-work criteria.
Use the top driver list to target mitigation that yields the largest reduction, such as stabilizing exposed soil, reducing runoff concentration, or increasing buffers. Export the CSV or PDF to support environmental plans, toolbox talks, daily briefings, and audit trails. Re-run the assessment after rainfall, design changes, or sequencing updates to keep the risk picture current.
Quick answers for consistent use and documentation.
It is a 0–100 screening score combining hazard conditions, your likelihood rating, weighted impacts, and the selected mitigation level. Use it to compare options, not as a substitute for detailed design or statutory approvals.
Base ratings on similar projects, site history, and current constraints. If uncertainty is high, rate conservatively and document assumptions. Update ratings after investigations, weather changes, or revised sequencing.
Area mainly provides context for reporting and does not dominate the index. Larger sites can still score low if controls and conditions are favorable, but they typically require more extensive implementation and inspections.
Poor drainage increases ponding and concentrated flows, which accelerates erosion and increases sediment transport. Improving drainage or staging temporary measures often reduces risk faster than small parameter tweaks.
Choose enhanced when work is near sensitive receptors, slopes are steep, or controls must withstand heavy rainfall. Enhanced measures should be supported by inspection plans, maintenance resources, and clear responsibilities.
Yes. The CSV supports logs and spreadsheets, while the PDF supports attachments to plans and meeting notes. Treat exports as snapshots and re-run the calculator whenever site conditions or controls change.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.