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' k,`+.. ~ .-~~' ' Page 1 Richard Domingue February 6, 1981 More recent work by Wilson (1973), concludes that "The Langbein-SChumm rule is fully supported by this research and indeed can be expanded. ...the variations observed in sediment yield are actually the combined result of variations in water yield (runoff) and in sediment concentrations,~two hydrologic quantities that are only partly interrelated. In general, factors that influence concentration are most important than those that influence runoff." It is interesting that the discussion supplied by the applicant cites work by Cendy and Bolton (1976). Schumm (1977, p. 29) refers to the same paper, "A more recent analysis by bendy and Bolton (2976) of data from 800 drainage basins scattered throughout the United States reveals that a peak of sediment yield exists between 1 and 3 inches of runoff." The applicant reports that runoff at the minesite is approximately 1 inch per year. The proposed criterion of 0.02 acre-feet/acre of disturbance for designing pond sediment volume is unacceptable. Sediment ponds must be redesigned if this criteria was used to estimate sediment storage volumes. The applicant may use 0.1 acre-ft/acre of disturbance, an accepted estimating technique (such as USLE), or on-site measurements of annual yield (if the period of record is sufficiently long). REFERENCES: 1. Bendy, F.E., and Bolton, C,C., Z976, Sediment-yield-runoff-drainage area relationships in the United States: J. Soil Water Conservation, Vol. 31, pg. 264-266. 2. Langbein, W.B., and Schumm, S.A., 1958, Yield of Sediment in Relation to Mean Annual Precipitation: Am. Ceophys. Union Trans., v. 39, pp.I076-1084. 3. Schumm, S.A., 1977, the Fluvial System: A Wiley-Interscience Publication, John Wiley and Sons, New York, 338p. 4. Wilson, Lee, 1973, Variations in Mean Annual Sediment Yield as a Function of Mean Annual Precipitation: American Joutnal of Science, vol. 273, pg. 335-349.