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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />21 <br /> <br />07/16/99 <br /> <br />suspended load is comprised of all of the material carried in suspension. The second system of <br />classification divides the sediment load into wash load and bed-material load. The wash load is <br />made of very fine materials, clay and silt, rarely found in the bed. The wash load does not depend <br />on the carrying capacity of the stream but on the amount supplied by the watershed. The bed- <br />material load is comprised of all of the material found in the bed. Some of it will move very close <br />to the bottom but some may be found in suspension. <br /> <br />Quantification of sediment transport is fraught with uncertainty because of the complexity of the <br />phenomenon and its inherent spatial and temporal variability. Existing mathematical representations <br />have relied heavily in experimental results. The available sediment transport fonnulas have been <br />grouped according to the approach used to derive them. Three major approaches have been used: <br />shear stress, power, and parametric. F onnulas can also be grouped according to the component of <br />the total load they attempt to quantify: bed load, suspended load, or bed-material load. Table 2 <br />summarizes the more commonly used fonnulas, however is not intended to be a complete listing. <br />