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Susan Morrison <br />2 September 18, 1992 <br />equation, predictably results in lesser sediment yield numbers. I spoke with both Steve <br />Parsons (OSM-Hydrologist), and Dr. Richard Warner (co-author Sedcad) regarding the <br />appropriateness of the Average Annual R Method. Both individuals indicated their <br />confidence in the method. I would agree that there is sound logic and basis for the <br />equation; however, as with any predictive model, it may or may not provide accurate <br />prediction. Detailed scrutiny of the input parameters is crucial. <br />My recommendation is that we accept the method, for now, and until we have evidence <br />that it is not appropriate. Again, its your call as to whether the specific input parameters <br />for this application require review by your team hydrologist. Ultimately, as long as the <br />operator commits to a specific elevation for sediment removal, we have adequate <br />enforcement capability. I suspect that the operator will find that the 3.01 acre-feet of <br />storage will not be adequate for a seven year period, but it will be their responsibility to <br />maintain the pond in accordance with the plan. <br />Let me know if you have any questions. <br />DAB/yjb <br />cc: Larry Routten <br />Cathy Begej <br />m:\oss\yjb\hydro <br />