A 'rapid' is a section of a river where the river bed has a relatively steep stream gradient causing an increase in water velocity and turbulence.

Subsequent erosion of the Targhee Uplift was driven by steepened stream gradients.

The much larger drainage area and yet steeper stream gradient helped to further accelerate downcutting.

This steepened the stream gradient of the ancestral rivers and other streams on the plateau.

On topographic maps, stream gradient can be easily approximated if the scale of the map and the contour intervals are known.

The latter depends on the quantity of water flow and stream gradient.

The point on a stream's profile where a sudden change in stream gradient occurs.

Warping or faulting of a drainage basin will steepen the stream gradient followed by the downcutting.

The species prefers low to moderate stream gradients.

The channel type developed depends on stream gradient, riparian vegetation and sediment supply.