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<br />'I <br />Ie <br />II <br />I <br />I <br />I <br />I <br />I <br />II <br />-. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br /> <br />Sediment (or fluvial sediment) - Fragmental material transported, suspended, or <br />deposited by water. <br /> <br />5ediment Concentration (by weiqht or by volume) - Weight or volume of <br />sediment relative to quantity of transporting or suspending fluid or fluid-sediment <br />mixture. <br /> <br />Sediment Discharqe - T he quantity of sediment, by weight or volume, that is <br />carried past any cross section of a stream in a unit of time. Dischar'Je may be <br />limited to certain sizes of sediment or to a specific part of the cross section. <br /> <br />Sediment Yield - The total sediment outflow from a watershed or a drainage <br />area at a point of reference and in a specified time period. This outflow is equal to <br />the sediment discharge from the drainage area. <br /> <br />Seepaqe - 1 he slow movement of water through small cracks and pores of the <br />bank material. <br /> <br />5eiche - Long-period oscillation of a lake or similar body of water. <br /> <br />Siqnificant Wave - A statistical term denoting waves with the average height <br />and period of the one - third highest wave of a given wave group. <br /> <br />Set-!JE - Raising of water level due to wind action. <br /> <br />Shallow Water (for waves) - Water of such a depth that waves are noticeably <br />affected by bottom conditions; customarily, water shallower than half the <br />wavelength. <br /> <br />5ilt - Material finer than O.62mm and coarser than O.004mm that is nonplastic <br />or vey slightly plastic and exhibits little or no strength when air-dried (Unified Soil <br />Classification System). <br /> <br />Slope (of channel or river) - Fall per unit length along the channel centerline. <br /> <br />Slouqhinq - Shallow transverse movement of a soil mass down a stream bank as <br />the result of an instabilit~' condition at or near the surface (also called slumping). <br />Conditions leading to sloughing are: bed degradation, attack at the bank toe, rapid <br />drawdown, and slope erosion to an angle greater than the angle of repose of the <br />material. <br /> <br />Slope-Area Method - A method of estimating unmeasured flood discharges in a <br />uniform channel reach usin'~ observed high-water levels. <br /> <br />Soil-Cement - A desi~lned mixture of soil and portland cement compacted at a <br />proper water content to form a veneer or structure that can prevent streambank <br />erosion. <br /> <br />liii <br />