What is scouring around a pier, and how does it affect stability?

• A. Scouring Is The Buildup Of Sediment Around The Base That Strengthens Soil.
• B. Scouring Is Erosion Around Foundations Reducing Soil Support; It Can Lead To Settlement Or Collapse.
• C. Scouring Is A Method Of Testing Foundation Strength.
• D. Scouring Is Water Flow That Strengthens The Pier Footing.

Answer: (B)

Scouring around a pier is the erosion of soil around its foundations caused by moving water. As water flows, it removes the supporting soil next to the footing, reducing bearing capacity and vertical support. With the soil around the base worn away, the pier can settle unevenly or shift, which weakens stability and can lead to settlement or even collapse if the erosion continues. This is not a buildup of sediment that strengthens the base, not a testing method, and water flow does not strengthen the footing—scouring weakens the foundation by removing the support needed to carry loads.