Our team uses chemical light sticks at night to check for “strainers” under bridges, etc. and to get an estimate of how fast the water is moving.
"strainers"?
Strainers are basically bushes or 'something' that will let water flow through but 'catch' anything of larger size. If you're caught in one, the waters current will hold you in place. They're damn near impossible to get out of. Big time drowning hazard!
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