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<br />Manning's n - A roughness coefficient used in the Manning equation for uniform steady <br />flow, V = (1.49 · R213 · S1I2) I n, where V is mean velocity, 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 2mplitude - 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 pattem 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 leyee - A low, alluvial ridge adjoining the channel of a stream formed by <br />sediment deposited by floodwaters that have overflowed the channel banks. <br /> <br />Natural Sb-eam channel - A channel segment whose alignment, dimensions, cross- <br />sectional shape, and grade have not been intentionally by humans. <br /> <br />Noncohesive soil - Soil particles that have no natural resistance to being pulled apart at <br />their point of contact, for example, silt, sand, and gravel. <br /> <br />Odgaard vlmes - 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, which may be in the form of liquids, emulsions, or slurries, are <br />normally applied by mechanical broadcasters. <br /> <br />Overbank Jlow - Flow which is not confined to Ihe channel. <br /> <br />Oxbow - lhe bow-shaped or horseshoe-shaped reach of a former meander loop, that is <br />left when the stream cuts a new shorter channel across the narrow neck <br />between two bends of the meander. <br /> <br />Pavement - Streambank surface covering, usually impermeable, designed to serve as <br />protection against erosion. Common pavements used on streambanks are <br />concrete, compacted asphalt, and soil- cement. <br /> <br />xx <br /> <br />Colorado Erosion Control Manual <br />