Laminar flow is the fastest water travelling with no restrictions in a straight line down a river.
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Toward the middle of a river, water tends to flow fastest; toward the margins of the river it tends to flow slowest. 2. In a meandering river, water will tend to flow fastest along the outside bend of a meander, and slowest on the inside bend.
Eddy. A piece of calm water where a kayaker can rest, catch their breath, read and run the next rapid and keep control and safety of a group. It is formed on a downstream face of an obstruction. Eddy Line.
Water moves most quickly when it has less resistance, so the friction of water against rocks slows it down. For that reason, the fastest part of a river tends to be in the center, just below the surface. This is where friction is lowest.
Thalweg. In hydrological and fluvial landforms, the thalweg is a line drawn to join the lowest points along the entire length of a stream bed or valley in its downward slope, defining its deepest channel.
Most of us perceive water flow as the speed or rate at which water appears to be moving, referred to as current. Hydrologists and other environmental scientists use a more exact measure for rivers and streams, called discharge or flow.
A riffle is a very small rapid and often nothing more than a little bubbly water that flows over a shallow section of the river. Riffles are not usually named (though some are) and most pose little threat to an oar boat or paddle raft.
River bifurcation (from Latin: furca, fork) occurs when a river flowing in a single stream separates into two or more separate streams (called distributaries) which then continue downstream.