
| Large Woody Debris (LWD) installation
on the Cedar River east of Renton. |
| Rivers everywhere contain naturally occurring
hazards that require river users to possess skill and knowledge to avoid,
and the judgment to know when the risk is too great. However, man-made obstacles are increasingly
being built in rivers and streams for many purposes. They may
be designed to facilitate fish habitat, capture of hatchery stock, irrigation,
or for purposes such as highway or bridge structures. These obstacles
may be constructed without warning, with little or no clear signage
or notice to local residents or river users, and with inadequate thought
to the effect on river users. Unlike naturally occurring hazards, man-made
structures can be constructed such that they may survive in high velocity,
turbulent, or constricted parts of the river where naturally occurring
debris might not. When man-made obstacles containing sharp projections
and sieve-like features are constructed in technically challenging unnatural
portions of the stream bed, or in areas used by inexperienced people,
the hazard to river users can be extreme. | Safety GuidelinesThe River Safety Council has developed clear information about these structures and a recommended process
for minimizing and mitigating the hazards they create.
LWDSafetyGuidelines.pdf
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