Glossary Cataract: series of rapids or waterfalls on a large river. Channel: deeper part of a river; usually more navigable. Confluence: place where two rivers come together. Dam: structure designed to hold back river water, creating a reservoir. Delta: fan-shaped area of sediment at mouth of a river. Drought: long period with little or no rainfall. Erosion: process of wearing away. Flood: when water flows across land that is normally dry. Flow: movement and speed of water. Headwater: where a river begins. Irrigation: water used for farmland. Meander: stretch of river that changes course many times. Mouth: end of a river. Recreation: refreshment of a person’s mind and body. River: naturally winding water pathway. Sand bar: submerged ridge of sand or gravel. Tributary: stream or river that feeds into a larger waterway.
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