Williams River

NOTE: Enter the Confinement Evaluated first, then the Scores, then the rest.

Rapid Geomorphic Assessment
	Confinement Evaluated	Unconfined
	Geomorphic Assessment Scores
		Score	STD (7.5)	Historic (7.5)
7.1	Channel Degradation	9	B to F	Yes
7.2	Channel Aggradation	9	None	No
7.3	Widening Channel	11	None	No
7.4	Change in Planform	9	None	No
	Total Score	38
	Condition Rating	0.47
7.5	Channel Evolution Model	F
	Channel Evolution Stage	IV
7.6	Geomorphic Stream Condition	Fair
7.7	Stream Sensitivity	Extreme
7.5	Channel Adjustment Processes Narrative
	This reach is highly depositional after the July 2014 flood. During the flood the channel scoured down and widened, before filling with cobble and gravel. The consistent bank scour and erosion depict the incision and widening process during the floods. After scouring down and out the channel filled with flood deposits creating very large mid-channel and diagonal bars. The channel is currently adjusting planform as it works through the flood deposits. Numerous floodchute and a large avulsion formed during the recent floods and remain accessible in future events. More than half of the reach is incised (primary cross-section), however incision is not an active process and the channel is aggrading to restore floodplain access. The secondary cross-section represents several areas where the channel dramatically over-widened and has subsequently filled in with large volumes of sediment allowing for floodplain access. For these reasons this reach is given a channel evolution stage of IV with the dominant channel adjustment process being planform adjustment and aggradation.