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<br />Subiect:
<br />
<br />"Design Recurrence Intervals Study." Advanced Sciences, Inc. (ASI) Task 9.
<br />August 28, 1990.
<br />
<br />Subiect:
<br />
<br />This report presents a comprehensive literature review prepared for EG&G Facilities
<br />Engineering, Plant Civil/Structural Engineering, It was prepared in response to the
<br />Agreement in Principle between the Colorado Department of Health and the U,S,
<br />Department of Energy,
<br />
<br />"Water-Yield and Water-Quality Study of Walnut Creek and Woman Creek
<br />Watersheds." ASI Task 4. September 18, 1990.
<br />
<br />This comprehensive and detailed statistical water yield analysis was done for EG&G
<br />Facilities Engineering, Plant Civil/Structural Engineering in response to the Agreement in
<br />Principle between the Colorado Department of Health and the U,S, Department of Energy.
<br />
<br />The report documents the design storm recurrence intervals and durations used by various
<br />agencies with jurisdictional responsibilities at the Rocky Flats Plant as well as other non,
<br />jurisdictional agencies. No recommendation for the use of a specific design storm is made,
<br />
<br />This report presents and documents a statistical analysis of rainfall-runoff relationships for
<br />development of water-yield on a monthly and an annual basis for Woman Creek and Walnut
<br />Creek. Data from 28 USGS gaging stations in eastern Colorado, which were judged to have
<br />similar climatologic and topographic characteristics to the Rocky Flats Plant, were used in
<br />the analysis,
<br />
<br />This is an excellent report for reference purposes and to compare the multitude of criteria
<br />applicable to flood control engineering,
<br />
<br />Limitations
<br />
<br />Limitations
<br />
<br />1.
<br />
<br />This report is intended only to review literature and not to synthesize or
<br />evaluate information,
<br />
<br />Data Included
<br />
<br />Data Included
<br />
<br />1. A comprehensive summary of design-flood criteria and the facilities to which
<br />they apply (storm sewers, dams and spillways, Denver region storm drain
<br />system, highway facilities, landfills, and hazardous waste sites) is presented in
<br />Appendix B of the document, The criteria used by the following agencies are
<br />listed: Department of Energy, U,S, Army Corps of Engineers, Colorado State
<br />Engineer, UDFCD, Colorado Department of Highways, Federal Highway
<br />Administration, Bureau of Reclamation, Soil Conservation Service, Jefferson
<br />County, Colorado Department of Health, Environmental Protection Agency,
<br />and Nuclear Regulatory Commission,
<br />
<br />2,
<br />
<br />Precipitation values for the Rocky Flats Plant site are presented in Appendix
<br />D of the document for recurrence intervals of 2-, 5-, 10-, 25-, 50-, and 100-
<br />years, and for PMP events with durations of 5-, 10-, 15-, and 30- minutes, and
<br />1" 2-, 6-, 24-, and 72-hours, Sources for the precipitation values are
<br />documented, II
<br />
<br />1.
<br />
<br />There were no data for the period from November through March for any of
<br />the gaging stations, However, these data were estimated.
<br />
<br />
<br />1.
<br />
<br />A comparison of observed and estimated annual yields for Woman Creek,
<br />North Walnut Creek, and South Walnut Creek is included in Table 4 of the
<br />document.
<br />
<br />2,
<br />
<br />Estimated monthly yields of Woman Creek, Walnut Creek, North Walnut
<br />Creek, and South Walnut Creek are given in Table 5 of the document,
<br />
<br />3,
<br />
<br />A regression line and equation of annual yield versus drainage basin area for
<br />28 USGS gaging stations in eastern Colorado are shown in Figure 4 of the
<br />document.
<br />
<br />4,
<br />
<br />Results of a water-quality loading analysis are presented in Table 6 of the
<br />document, II
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