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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 />
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