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<br />e <br /> <br />Manning's n - A roughness coefficient used in the Manning equation for unifonn steady <br />flow, V = (1.49' R213 · S1I2) / n, where V is mean vdocity, R is hydraulic <br />radius, and S is slope. <br /> <br />Mattress . A covering of concrete. wood, stone, or other material used to protect a <br />streambank against erosion. <br /> <br />Mean annual flood - The logarithmic mean of the annual series. which has a recurrence <br />interval of 2.33 years. <br /> <br />Meander . A broad, looping bend in a stream channel. <br /> <br />Meander amplitude - Meander belt width. usually expressed as a multiple of stream <br />width. <br /> <br />Meander wavelength - The average distance from crest to crest, or trough to trough, in a <br />series of meanders, usually expressed as a multiple of stream width. <br /> <br />Meandering stream - A single channel waterway having a pattern of successive <br />deviations in alignment and flow direction. <br /> <br />Middle bank - That portion of a streambank having an elevation approximately the same <br />as that of the mean water level of the stream. <br /> <br />Natural kvee - A low, alluvial ridge adjoining the channel of a stream fonned by <br />sediment deposited by floodwaters that have overflowed the channel banks. <br /> <br />Natwal slream channel . A channel segment whose alignment, dimensions, cross- <br />sectional shape. and grade have not been intentionally by humans. <br /> <br />Noncohes ive soil - Soil particles that have no natwal resistance to being pulled apart at <br />their point of contact. for example. silt. sand, and gravel. <br /> <br />Odgaard \ anes - See Iowa Vanes <br /> <br />Organic mixtures and mulches - Any of a number of agents (e.g. petrochemicals or <br />vegetative matter) used to stabilize a streambank against erosion by <br />providing protection and nutrients while vegetation becomes established. <br />These agents, whicb may be in the fonn of liquids, emulsions, or slurries, are <br />nonnally applied by mechanical broadcasters. <br /> <br />Overbank flow - Aow wbicb is not confined to the channel. <br /> <br />Oxbow - '[be bow-shaped or borseshoe-sbaped reach of a fonner meander loop, tbat is <br />left when the stream cuts a new sborter channel across the narrow neck <br />between two bends of the meander. <br /> <br />Pavement. Streambank surface covering, usually impenneable. designed to serve as <br />protection against erosion. Common pavements used on streambanks are <br />concrete. compacted asphalt, and soil- cement. <br /> <br />e <br /> <br />xx <br /> <br />Colorado Erosion Control Manual <br />