Type F streams are meandering, entrenched, and highly incised systems in low gradient landforms. In these systems, top-of-bank elevation is much higher than bankfull elevation. Type F streams are often working towards re-establishment of a functional floodplain inside the confines of a channel that is consistently increasing its width within the valley. These streams are characterized by very high channel width/depth ratios at the bankfull stage, and bedform features occurring as a moderated riffle/pool sequence. Type F stream channels can develop very high bank erosion rates, lateral extension rates, significant bare deposition and accelerated channel aggradation and/or degradation while providing for very high sediment supply and storage capacities. Boulder and bedrock systems are usually stable, while gravel and sand-bed F channels can have high bank erosion rates and are often a failed or failing Type C channel.
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