rapid

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rapid

[′rap·əd]
(hydrology)
A portion of a stream in swift, disturbed motion, but without cascade or waterfall; usually used in the plural.
References in classic literature ?
Thunder sounded in the distance, and she turned suddenly, rising on her hands and knees with the rapidity of a dog which hears a coming footstep.
He found that the sea was pouring into the fifth compartment; and the rapidity of the influx proved that the force of the water was considerable.
While the count picked up the paper he put spurs to his horse, which leaped in astonishment at such an unusual stimulus, and shot away with the rapidity of an arrow.
rejoined Toby, with a rapidity and loudness of utterance that almost led me to suspect he had been slyly devouring the broadside of an ox in some of the adjoining thickets.
The houses and the signs of life apparent in the village drove the alarmed birds from the direct line of their flight, toward the mountains, along the sides and near the bases of which they were glancing in dense masses, equally wonderful by the rapidity of their motion and their incredible numbers.
Corruption comes with startling rapidity to beings whose destruction has been due wholly or in part to lightning--the whole mass seemed to have become all at once corrupt
I could understand the reason for this, as with the narrowing expanse of Omean as the waters rose toward the apex of its dome, the rapidity of its rise would increase in inverse ratio to the ever-lessening space to be filled.
Caught in these eddies of the atmosphere, it spun about with a rapidity that made their heads reel, while the car oscillated and swung to and fro violently at the same time.
As the noise and rapidity of the drumbeats increased the dancers apparently became intoxicated with the wild rhythm and the savage yells.
Twenty leagues more, performed with the same rapidity, twenty more leagues devoured, and no one, not even D'Artagnan, could overtake the enemies of the king.
He was delighted at the unexpected rapidity of his pupil's progress, but could not abandon the edifice of argument he had laboriously constructed.
For the period of an ordinary charge he can cover the ground with greater rapidity possibly than any other creature in the world.