What should be avoided when placing drainage at a site?

• A. High points, ridges.
• B. Areas with dense rock.
• C. Low points or valleys that could be a focal point for water collection, floodplains, and areas with high water tables.
• D. Near the center of the site.

Answer: (C)

Water drainage should be placed where it can effectively move water away from the site. The main idea is to avoid spots that naturally collect water. Low points or valleys act as catchments for surface runoff and groundwater, so they tend to flood, have higher water tables, and make drainage systems less effective. Placing drains in these areas can lead to standing water, moisture issues, and erosion, defeating the purpose of drainage. Instead, route drainage along higher, better-drained areas and toward outlets that carry water away from the site. While other terrain features like ridges, dense rock, or central locations can present challenges, the key risk to avoid is creating or locating drainage in depressions where water tends to accumulate.