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You are looking at a preview of what’s in the timed Water Rescue for the First Responder Course. Feel free to look around, but you’ll need to register to begin progress toward getting your Water Rescue for the First Responder Course Completion Certificate.

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Tree branches hanging in a river's path

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.