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EVALUATION OF ON-SITE EROSION C,UNTROL EFFECTIVENESS <br />• AND SEDIMENT YIELD <br />AT <br />ORCHARD VALLEY NINE <br />Preface <br />Ma[[hr'w S. Sakurada <br /> <br />Colorado lJes[moreland commissioned Dr. Charles F. Leaf [o study on-site ero- <br />sion control and sediment yield [o assist in sizing the sediment retention Hoods <br />at Orchard Valley Mine. The calculations were done before final completion of the <br />drainage plan. The calculations are basically correct in assumptions, theory and <br />basis. The areas within the study were changed within [his application [ext. To <br />.u1~i connle[eness [o [he report, all inEorr.a[ion was retained, but extraneous mate- <br />rial is narked as such. <br /> <br />_~ <br />