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Course Outline

A strainer is created by a manmade or natural obstruction such as a tree, root system, fencing, or guard rails.

  • An obstruction allows water to pass through but stops and holds objects such as boats and people.
  • Bouncing twigs may indicate a partially submerged strainer.
  • Vehicles in the water are undercut strainers.
Tree branches hanging in a river’s path
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