Which mechanism exacerbates flood risk when constructing buildings within an alluvial fan?

💡 Explanation

When buildings confine alluvial fan channels, channelization intensifies because the natural lateral movement is prevented, creating concentrated high-velocity flows, increasing flood risk. Therefore channel confinement exacerbates flooding, rather than compaction, vegetation removal, or subsidence, which have different impacts on flow dynamics.

• Which mechanism causes dry conditions at latitudes around 30 degrees north and south?
• Which outcome results when an air mass moves poleward in Northern Hemisphere at high speed?
• Which mechanism causes the Intertropical Convergence Zone to experience a seasonal shift in latitude?
• Which mechanism causes increased groundwater arsenic concentration in alluvial aquifers after prolonged flooding?
• Near a continental transform fault, which process most frequently causes shallow-focus earthquakes?
• Prolonged rainfall increases stress on river levees, causing which failure mode when shear strength decreases?