Bailer - An open-ended container or bucket used to remove water from a raft.
Chute - A narrow channel through which the flow of water is swifter and deeper than the normal flow.
Duckie (or ducky) - An inflatable kayak.
Eddy - A current of reverse water flow sometimes creating a small whirlpool.
Gradient - Drop in elevation during the downstream flow of a river. Rate of gradient is usually expressed in number of feet decreased per mile.
Hole - A depression in the river caused by reverse water flow. Also may be called a hydraulic.
Hydraulic - A very large hole with reverse water flow.
Hypothermia - A dangerous lowering of body-core temperature, caused by losing heat faster than it is produced by the body. Hypothermia is a threat when water temperatures are below 60 degrees Fahrenheit or air temperatures are below 50 degrees Fahrenheit.
Pool - An area of flatwater between rapids.
Pool Drop - A whitewater rapid, usually of short duration, that begins and ends with fairly calm water rather than continuous water flow.
Portage - To carry a raft around unraftable or unsafe rapids or falls.
Put-In - The starting point of a rafting trip, where rafts are put into the river.
Rapids - A series of waves and turbulences.
Riffle - A very small rapid or wave caused by a shallow sand bar or rocks extending across a stream bed.
Scout - To visually survey a rapid from the riverbank to select the best route.
Standing Waves - A series of stationary waves caused by water converging at the end of a tongue or a submerged object.
Take-Out - The point where the rafting trip ends and the rafts are removed from the river.
Throw Bag - A small bag containing a coiled rope that is used to rescue rafters in a river.
Tongue - A narrow depression between waves.
Whitewater - Moving water whose surface becomes turbulent or frothy by passing either over rocks, through a narrow river channel, or down a steep gradient.