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<br />.' <br /> <br />e <br /> <br />u.s. Interagency Committee of Water ReSources, 1 96 la, A study of methods used <br />in loads in measurement and analysis of sediment loads in streams, Report <br />No. 13, The single-stage sampler of suspended sediment: St. Anthony <br />Falls Hydrologic laboratory, Minneapolis, Minnesota, 105 p. <br /> <br />1961b, A study of methods used in loads in measurement and analysis of <br />sediment loads in streams, Report No. 14, Determination of fluvial <br />sediment discharge: st. Anthony Falls Hydrologic Laboratory, Minneapolis, <br />Minnesota, 105 p. <br /> <br />DEFINITION OF TERMS <br /> <br />Acre-foot.--The quantity of water required to cover 1 acre to a depth of 1 <br />foot. It is equivalent to 43,560 cubic feet, about 326,000 gallons, or <br />1,233 cubic meters. <br /> <br />Bed1oad.-Material moving on or near the streambed by rolling or sliding. It <br />sometimes makes brief excursions into the flow a few diameters above the <br />bed. <br /> <br />Bed material.--'Ibe material of which a streambed is composed. <br /> <br />CUbic foot };er seoond.-'Jhe rate of discharge representing a volume of 1 cubic <br />foot passing a given point during I second and is equivalent to <br />approximately 7.48 gallons per second or 448.8 gallons per minute or <br />0.02832 cubic meter };er second. <br /> <br />e Depth-integrated sample.--A suspended-sediment sample that is accumulated <br />oontinuously in a sampler which is moved vertically at a oonstant transit <br />rate and which admits the water-sediment mixture at a velocity equal to <br />the stream velocity at every point of transit. <br /> <br />Double-mass curve.-As used in this report, a rouble-mass curve is oonstructed <br />by plotting cumulative annual stream discharge against cumulative armual <br />s~nded-sediment load. <br /> <br />Flow-duration curve.--A cumulative frequency curve that shows the };ercentage <br />of time that specified discharges are equaled or exceeded. <br /> <br />Gaging station.--A site on a stream, canal, lake, or reservoir where <br />systenatic observations of hydrologic data are obtained. <br /> <br />Streamdischarge.--As used in this report, the discharge that occurs in a <br />natural channel. <br /> <br />Suspended sediment.--The sediment that at any given time is maintained in <br />susJ;ellsion by the upward components of turbulent currents or that exists <br />in sus};ension as a colloid. <br /> <br />e <br /> <br />16 <br />