Other
Functions / Findings
•2% LWD
content in the bed can account for 50% of the roughness (Magna and Kershner 2000)
•Frequency
of quality pools decreased in 52-54% of Columbia Basin rivers draining managed watersheds since roughly
1940 (McIntosh et al. 2000)
•Resistance
to flow in vegetated floodplain channel is 40% greater with LWD than without. Velocities were higher and depths were lower
without LWD. (Abt et al.
1998)
•
•In western
Washington:
•Average
diameter, length, and volume of LWD pieces increases with stream size (Bilby and Ward 1989)
•In streams
<7m channel width, 40% of LWD pieces were oriented perpendicularly to flow (Bilby and Ward
1989)
•In streams
>7m channel width, 40% of LWD pieces were oriented downstream (Bilby and Ward 1989)
•Pool area
correlated with the volume of the LWD forming the pool in streams of all sizes (Bilby and Ward 1989)