"fast river" is correct and usable in written English.
You can use it when referring to a river that is flowing quickly due to a lot of rainfall or water running off nearby land. For example: "The rain was so heavy that the fast river flooded the nearby town."
Indeed, they may gradually help us to bring the fast river of time to a slow meander.
Anyone who's ever run a fast river knows how much skill and daring -- not to mention muscle -- are required.
ON the day I visited Newport Pier just after Christmas such a fierce wind was blowing that the tide raced under the pier like a fast river.
The presence of wavy layers in sandstone indicates the sediments were deposited by a stream or river moving at slow to moderate speed, whereas layers with lots of pebbles indicate a larger and very fast river.
And that is where I want to leave him — standing on an erratic boulder halfway across a deep fast river with three thousand cubic feet of water going past him every second.
Hard by the fast river and its Victorian suspension pedestrian bridge is the Cambus o'May creamery, a drop-in working dairy where cheesemaker Scott Sutherland-Thomakesmekes me welcome with nibbles of their unpasteurised, umami-rich cheeses.
"We had two beautiful, flowing, fast rivers.
The giant otter shrew is found in fast-flowing mountain streams, large, fast rivers, sluggish coastal streams, and swamps.
The thought of waiting a decade (or more?) to adventure over high peaks, open ocean and fast rivers made me more nauseated than morning sickness.
Ranjan Panda, Convenor, Water Initiatives Odisha, correctly points out that industrialisation is destroying our forests and rivers: "Natural forests are vanishing fast, rivers and other water bodies are dying and decaying in the country".
Debris flows sometimes ooze along, and sometimes move as fast as the fastest river rapids.
