River guide has the pictures of weirs.
| Who | Difficulty | Knownledge |
|---|---|---|
| beginners | max. WW I- | all can be beginners, but a wheelman must known to drive the boat |
| experienceds | max. WW II | wheelman must be able to drive a boat with some experience |
| expert | WW II and more | all in boat must be able to drive a boat, good experience and material equipments |
| River guide has the pictures of weirs. |
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