Active Fluvial Unit (AFU) definition
Active Fluvial Unit (AFU) means that portion of a floodplain or alluvial fan over which water can be expected to flow during a runoff event of magnitude 1 in 100yrs, and that portion of an AFU on which there is evidence of hydorgeopmorphic processes, active within at least one full rotation (100yrs on average). The ‘active’ portion is defined by the size and power of the stream and the dominant hydrogeopmorphic processes.
Active Fluvial Unit (AFU) means that portion of a Floodplain over which water can be expected to flow during a runoff event of magnitude 1 in 100 years, and that portion of an AFU on which there is evidence of hydrogeomorphic processes, active within at least one full rotation (100 years on average). The ‘active’ portion is defined by the size and power of the stream and the dominant hydrogeomorphic processes;