riffle

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riffle

US and Canadian
a. a rapid in a stream
b. a rocky shoal causing a rapid
c. a ripple on water
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

riffle

[′rif·əl]
(hydrology)
A shallows across a stream bed over which water flows swiftly and is broken into waves by submerged obstructions.
Shallow water flowing over a riffle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In most cases, larger fish occur in pools while smaller fish occur in shallower areas such as riffles. Smaller fish use riffles because they are not able to compete with the larger fish for space in the pools (Freeman and Stouder, 1989), or because the riffles act as a refuge from predators (Power, 1984, 1987; Power et al., 1985; Schlosser, 1987, 1988b).
The CID police made arrest of three alleged terrorists of banned outfit, who were belonged to Sher Khan Mehsud Group from Mangopeer namely Sital Khan, Mubashar and Risalat Khan and recovered 3 hand grenades, pistols and two riffles. They were also in taking extortion from traders.
While directing the Village Defence Riffles, it has been particularly defined that these rifles should not be handed over to such peoples, who had been accomplice in any kind of riots and militant activities in the past.
The police also recovered 206 bottles of liquor, 530 gram hashish, four pistols, four riffles and rounds.
The police also recovered six riffles 444 bore, a riffle 8mm, a riffle 7mm, a riffle repeater 12 bore, a carbeen 12 bore, eight pistols 30 bore and rounds from them.
The competitors were tested on the use of three riffles, AK 47, FN Riffle and Pistol at various and different ranges.
The department also awarded a Sh342 million contract for the supply of riffles and full bore target riffles to a firm known as Mildat SP.
The police also confiscated seven riffles and cartridges from the possession of the accused and registered a case against him.
According to a PHP spokesman, the officials also recovered 3,044 litres liquor,43,014 grams charas,38 Kg opium,four Kalashnikovs,,nine riffles, 17 guns,,65 pistols and bullets from their possession.
According to PHP spokesman, the officials also recovered 419 liters liquor, 7,856 grams charas, 32 pistols, eight riffles, 70 cartridges, 14 magazines and 701 bullets from their possession.
According to details, during different search operations Karachi police arrested one absconder and five street criminals and recovered three riffles, one hand grenade, explosive martial and six pistols with rounds from their possession.
Long shallow stretches are interspersed with sections having more gradient, where the water runs faster over riffles, into holes, and on through long runs.