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.

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