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I I I I I I I I I I I I I I I I I I I - FLOOD RELATED STUDIES - Past floods on Boulder Creek have elicited 19 previous studies related to delineating and mitigating flood hazards associated with Boulder Creek. These studies have been performed by various organizations as summarized below: Report Name 1. "The Improvement of Boulder Creek" 2. " I 308 '" Report on the Platte River Basin 3. South Platte River and Tributaries, Colorado, Wyoming and Nebraska 4. "Flood Information Report" 5. Reconnaissance Report "St. Vrain Unit, Colorado" TABLE 1 SUMMARY OF PREVIOUS STUDIES Responsible Entity Frederick L. Olmstead U.S. Army Corps of Engineers (COE) COE U.S. Geological Survey (USGS) U.S. Bureau of Reclamation (USBR) 6. Flood Plain Information COE Report 7. Master Plan for Boulder Creek - 24th to 30th Streets 8. Reconnaissance Report 9. Conceptual Plan for Boulder Creek Wright-McLaughlin Engineers, Denver, Colorado (W/Mc) COE W/Mc Year 1910 1938 1945 1961 1967 1969 1969 1970 1970 Content Land use relationship with Flood Plain Navigation, Flood Control, Power Develop- ment and Irrigation Flood Protection on Boulder Creek and Sunshine Creek Flood-frequency informa- tion upstream from 28th Street Damsite investigation on Boulder Creek Flood Plain Analysis based on 100-year dischar~e o~ 740D cfs Proposed improvements to 24th, 28th & 30th Streets based on 7400 cfs. Flood Control Measures for 7400 cfs. Proposed improvements from 9th to 14th, based on 7400 cfs. Report Name 10. General Design Memorandum 11. Responsible Entity COE Environmental Analysis Thorne Ecological Institute 12. Special Flood Hazard COE Information Report 13. "11 Point Flood Control COE Committee on Plan" Environmental Planning 14. Floodway Maps 15. Metropolitan Denver & South Platte River & Tributaries Study 16. Public Information Fact Sheet 17. Flood Insurance Study 18. Boulder Creek Phase B Preliminary Design 19. Boulder Creek Flood- plain Map Amendment Frazier & Gingery Engineers, Denver, Colorado COE COE Federal Insurance Administration URS Muller Engineering Company, Inc., Lakewood, Colorado Year 1971 1972 1972 1973 1974 1977 1977 1978 1979 1981 Content Development of Struc- tural and non-structural flood control concepts Environmental impact analysis of COE flood control concepts Basis for Boulder Participation in Flood Insurance Program Flood Control Plan based on aggressive land use management program for 7400 cfs Floodway maps based on 7400 cfs Re-Analysis of Boulder Creek hydrology increas- ing 100-year flood discharge to 12,000 cfs Development of Flood Control Plans for 12,000 cfs: I - enlarged Channel II - Excavated Floodway III - Relocation and Flood Warning. Based on 100-year dis- charge of 12,000 cfs. Used to convert City 'of Boulder to regular phase of the National Flood Insurance Program Development of a Master Plan of Flood Control Improvements Basis for revisions to the Flood Insurance Rate Map for the area east of 24th St. and north of Arapahoe Avenue 5