Which risk increased as medieval trestle bridges aged from stream erosion?

💡 Explanation

Increased settlement risk emerged because the underlying streambed undergoes scour. Local Scour gradually removes sediment around the trestle foundations, therefore the likelihood of a foundation sinking increases rather than cable fatiguing which would require a cable-based bridge.

• Which risk increases when Roman concrete fortifications were built with high amounts of seawater during construction?
• Which limiting behavior occurs when an astrolabe is physically deformed?
• What consequence results from inaccurate index mirror adjustment due to thermal expansion aboard an 18th-century sextant?
• Which consequence often resulted when Roman roads experienced prolonged transverse compression, specifically surpassing the roadbed's bearing capacity?
• Which outcome accelerated soil depletion in early maize agriculture?
• In Alhazen's experiments with lenses, through which focusing mechanism did spherical aberration arise in initial lens designs?