Which portion of a river is most likely to have the fastest rapids?
As shown in Figure 13.14, water flow velocity is decreased by friction along the stream bed, so it is slowest at the bottom and edges and fastest near the surface and in the middle.
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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.
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.
Laminar flow is the fastest water travelling with no restrictions in a straight line down a river. NFPA 1006 surface water rescue is defined as water flowing at less than 1 knot (1.15 mph).
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.