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14. Floodway Maps Frasier & Gingery 1974 Engineers, Denver, Colorado 15. Metropolitan Denver COE 1977 & South Platte River & Tributaries Study 16. Public Information COE 1977 Fact Sheet I I I I I I I I I I I I I I I I I I I - FLOOD RELATED STUDIES - 11. Past floods on Boulder Creek have elicited 20 previous studies related to delineating and mitigating flood hazards associated with Boulder Creek. These studies have been performed by various organizations as summarized below: 12. TABLE 1 SUMMARY OF PREVIOUS STUDIES 13. Report Name Responsible Enti ty Year 1. "The Improvement of- Frederi ck L. 01 mstead 1019 Boulder Creek" 2. " I 308 I" Report on the U.S. Army Corps of 1938 Platte River Basin Engineers (COE) Content Land Use relationship with Flood Plain Navigation, Flood Con- trol, Power Develop- ment and Irrigation Flood Protection on Boulder Creek and Sunshine Creek 3. South Platte River and Tributaries, Colorado, Wyoming and Nebraska COE 1945 U.S. Geological Survey 1961 (USGS) Flood-frequency infor- mation upstream from 28th Street 4. "Flood Information Report" 5. Reconnaissance U.S. Bureau of Report "St. Vrain Reclamation (USBR) Unit, Colorado" 6. Flood Plain Infor- COE mation Report 7. Master Plan for Wright-McLaughlin Boulder Creek - 24th Engineers, Denver, to 30th Streets Colorado (W/Mc) 8. Reconnaissance Report COE 9. Conceptual Plan for W/Mc Boulder Creek 10. General Design COE Memorandum 1967 Damsite investigation on Boulder Creek 1969 Flood Plain Analysis based on 7400 cfs 1969 Proposed improvements to 24th 28th & 30th Streets based on 7400 cfs. 1970 Flood Control Measures for 7400 cfs. 1970 Proposed improvements from 9th to 14th, based on 7400 cfs. 1971 Development of Struc- tural and non-structural flood control concepts Report Name Responsible Entity Environmental Anal- Thorne Ecological ysis Institute Year 1972 Special Flood Hazard COE Informa ti on 1972 "11 Point Flood Con- COE Committee on trol Plan" Environmental Planning 1973 17. Flood Insurance Study Federal Insurance Administration 1978 18. Boulder-Creek Phase B Preliminary Design URS 1979 19. Boulder Creek Flood- plain Map Amendment Muller Engineering Company, I nc. , Lakewood, Colorado 1981 20. Boulder Creek Flood Hazard Area Delin- eation 1983 UDFCD Content 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 Alert Proofing 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 Pl an of Fl ood Control Improvements Basis for revisions to the Flood Insurance Rate Map for the area east of 24th St. and north of Arapahoe Avenue Delineation of 100-year floodplain through City of Boul der 6