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<br />7. <br /> <br />"Water-Yield and Water-Quality Study of Walnut Creek and Woman Creek <br />Watersheds." Advanced Sciences, Inc. Task 4. September 18, 1990 <br /> <br />8. <br /> <br />"Storm-Runoff Quantity For Various Design Events Study." Advanced <br />Sciences, Inc. Task 6. January 8, 1991 <br /> <br />9. <br /> <br />"Storm Sewer Inflow/Infiltration and Exfiltration and Non-Point Source <br />Study." Advanced Sciences, Inc. Tasks 2 and 3. September 30, 1991 <br /> <br />10. <br /> <br />"Water-Yield and Water-Quality Study of Other Sources Tributary to Standley <br />Lake and Great Western Reservoir." Advanced Sciences, Inc. Task 16. <br />December 18, 1990 <br /> <br />11. <br /> <br />"Bypass Upstream Flows Around Rocky Flats Plant Study." Advanced <br />Sciences, Inc. Task 24. January 15, 1991 <br /> <br />Special thanks should be extended to Lee Wan and Associates, the U.S. Army Corps of <br />Engineers (USACE), and ASI for their detailed and comprehensive earlier work which <br />provided a basis for this Master Plan work. <br /> <br /> <br />12. "Alternatives to Zero Discharge Study." Advanced Sciences, Inc. Task 17. <br />June 11, 1991 <br /> <br />3. <br /> <br />The data provided in the reports are especially useful for calibration and <br />verification of selected master planning-derived flood discharges. This will <br />provide for a high level of confidence in the completed Master Plan by <br />relating to the work compiled by many investigators over a period of <br />approximately 15 years. <br /> <br />4. <br /> <br />The review of the reports demonstrates the advisability of using standards and <br />accepted urban drainage criteria of the Denver metro area as presented in the <br />UDFCD Manual. For instance, the various reports reviewed have included <br />different basin assumptions, they have each analyzed only a portion of the <br />site, one has considered only a single rainfall frequency, and different models <br />have been used for deriving flood flow magnitudes. <br /> <br />13. <br /> <br />PRECIPITATION DATA <br /> <br />"Draft Flood Plain Delineation." U.S. Army Corps of Engineers. Interagency <br />No. DE-AI34-90RF 57446. December, 1991. <br /> <br />Rainfall patterns and intensities derived using the UDFCD Manual are presented in Tables <br />IV-1 and IV-2 for the 2-hour and 6-hour design rainfall events. <br /> <br />A brief summary of each past study is included in Appendix IV-A to this section. The <br />findings are as follows: <br /> <br />1. <br /> <br />DESCRIPTION OF MODELS <br /> <br />The subject reports are an excellent source of data, assumptions and findings <br />related to storm rainfall, runoff, and flood routing. The reports provide a <br />credible and comprehensive technical background for commencing master <br />planning of drainage and flood control facilities at Rocky Flats. <br /> <br />Two hydrologic models recommended by the UDFCD Manual were used for this analysis. <br />One is the Colorado Urban Hydrograph Procedure (CUHP) (UDFCD, 1983). The second <br />is the Stormwater Management Model (SWMM) (UDFCD, 1986), which is used for routing <br />of sub-basin flood hydrographs downstream within the study basin boundaries. <br /> <br />2. Each of the reports, as well as the thirteen reports cumulatively, deal with <br />limited aspects or components of the drainage and flood control system. The <br />reports do not address the matter of overall drainage and flood control master <br />planning in a manner consistent with local and state governments. <br />