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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 <br />