Threshold — this is a short section of the river with a large drop and the velocity of water, usually complicated by numerous rocks or ridges and standing waves of converging jets. The approximation of the threshold can be found to slow the flow and the roar of falling water. Thresholds can be a little difficult to meet the tourists already on the routes I-III levels of difficulty. Therefore it is necessary to know at least the general rules for their passage. A simple threshold apparently overcome fairway as rapids, with a positive speed boats (ie, the presence of its own speed ahead in the moving water).
If a lot of stones in line and can not be avoided, it is necessary to maneuver between them. To do this, pritabanivat by obstacles and make strong strokes on the other hand, trying to like "obtech" stone hulled boat, all the while looking further way forward.
On small rivers tourists should keep the center line of the triangle formed by the converging streams of the threshold, because there are usually more depth and track cleaner. But on large rivers where the danger of being flooded with standing waves, we must avoid going four-sharp tip of the triangle. In any case, if the preliminary examination of the threshold (as it is for the novice traveler optional) gives reason to doubt the success of his passing, have a boat or twine to hold them along the shore.