Which process causes increased flood risk when increased impermeable coverage occurs on an alluvial fan?

💡 Explanation

When urbanization increases impermeable cover, infiltration decreases and runoff increases on an alluvial fan because water is unable to permeate the built-up surface. This leads to greater channel flow exacerbatin chanel bed aggradation due to sediment accumulation by reduced dispersal ability. Thus, aggradation of surface floe channes rather than other processes, is more likely to result.

• Which outcome occurs when seasonal meltwater floods a glacial valley?
• Which mechanism causes increased sediment deposition in the cutoff area of a forming oxbow lake?
• Which mechanism causes the formation of horst and graben structures within a continental rift zone?
• Which mechanism explains sediment layering in glacially-formed proglacial lakes with seasonal meltwater inflow?
• Which mechanism impedes vertical nutrient replenishment within stable subtropical ocean gyres?
• Which process accelerates sea stack collapse following wave erosion at the base?