In an urban woodland undergoing development, what approach should you take to assess landslide risk before accepting land?

• A. Use the map provided and delineate the developed areas on it using recent aerial photography
• B. Rely only on existing hazard maps
• C. Conduct soil boring campaigns without mapping
• D. Use the map provided and delineate the developed areas on it using recent aerial photography and inquire about more recent maps

Answer: (D)

Assessing landslide risk in an urban development setting hinges on using current, spatially explicit information and confirming it with updated hazard data. Delineating the areas that will be developed on the map using recent aerial photography helps identify which parts of the site are exposed to slope instability, surface disturbances, or drainage changes, and it reveals changes since older maps were produced. In addition, asking for more recent maps or updated hazard information ensures you’re not relying on outdated delineations that might miss new landslide-prone zones or newly identified hazards created by recent development or natural changes. While subsurface data from soil borings can be valuable, it must be interpreted within a mapped context of where instability is likely to occur; boring alone doesn’t establish the broader distribution of risk across the site. The strongest approach combines a current, photo-based delineation of developed areas with a request for the latest hazard information to capture the most relevant and up-to-date assessment before land acceptance.