riffle

hydrology

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July 19, 2026

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A riffle is a shallow portion of a stream bed, often found between deeper pools. These formations are typically observed in the straighter, wider sections of a meandering stream. Riffles and pools occur in a repeating pattern along most perennial stream channels where the bed material is coarser than sand. At low water levels, riffles are characterized by white water, distinguishing them from the smooth surface of pools.1

Hydrology is the scientific study of Earth's waters, focusing on their occurrence, distribution, and circulation through the hydrologic cycle, as well as their interactions with living organisms. It also examines the physical and chemical properties of water in all its phases. The hydrosphere encompasses all liquid and frozen surface waters, groundwater, and atmospheric water vapor, playing a crucial role in sustaining life on Earth.23

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pool and riffle
…loop is deep and undercut; riffles form in the shallow water of the short, straight, wide reaches between adjacent loops. The pools and riffles form sequences spaced at a repeating distance of about five to seven widths of the channel and often appear in stream development long before the stream…
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…loop is deep and undercut; riffles form in the shallow water of the short, straight, wide reaches between adjacent loops. The pools and riffles form sequences spaced at a repeating distance of about five to seven widths of the channel and often appear in stream development long before the stream…
Read More