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Understanding River Features: Safe Navigation and Hazards

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This guide explores various river features critical for paddlers and boaters. Learn about downstream currents, the formation of eddies, and how gradients affect water flow. Understand hazards like strainers and sweepers, which pose risks to navigation. Discover key terms such as eddy lines, holes, waves, and swirlies. These insights will help improve your river navigation skills, ensuring both safety and a more enjoyable experience on the water.

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Understanding River Features: Safe Navigation and Hazards

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Presentation Transcript

  1. River Features

  2. Downstream V • Surface signs of current running through an obstacle • Downstream V marks deeper water

  3. Eddy • An eddy is a place in the river immediately downstream of an obstacle such as a rock or stump, into which the current flows from below an obstacle, forming a pocket of upstream current.

  4. Eddy Line • The line formed between the downstream current and the upstream current of an eddy. • If the opposing currents are strong enough they could potentially create a bulge in the water. This bulge is referred to as a “fence.”

  5. Gradient • Gradient refers to the steepness of a rivers descent. • Gradient is generally measured in feet per mile.

  6. Hole A low spot in the river where water pours back upstream to fill it. They usually appear behind pour over rocks & ledges.

  7. Pillow • An upwelling if water on the upstream side of a rock or bank which can possibly deflect a boat around an obstacle.

  8. River Left/River Right • Describes position on the river as you look downstream. • Downstream is ALWAYS the frame of reference. LEFT RIGHT

  9. Strainer • An obstacle, usually a fallen tree or limbs that rests in the water with part of the obstacle under the surface. • The current can pull things down and through the obstacle and can be very hazardous.

  10. Sweeper • Riverside feature that has fallen out over the current extending downward toward the water. • This feature has the potential to “sweep” paddlers out of their boat if they attempt to pass through Branches over water= sweeper

  11. Wave • A place where the water rises up due to boulders or other features under the surface of the water.

  12. Swirlies-A whirling or eddying motion of water: a swirl of white water. These can cause paddlers to flip out of their boats.

  13. Surfing!

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