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I I I I I I I I I I I I I I I I I I I I-I SECT ION I SlJ.1MARY Reach 1 (Upstream Golden City Limit to Tucker Gulch) A tv,,)-fold strategy has been adopted for this reach; a long term alternative plan that ultimately removes all existing structures from the IOO-year floodplain, and a short term interim plan which serves to significantly re- duce flood damage costs by concentrating mitigation measures at critical areas. This report contains the second part, or Phase B, of the Major Drainageway Plan for Clear Creek - Youngfield through Golden. Preliminary design drawings and cost estimates have been prepared for the recommended pl an adopted by the Ci ty of Golden and Jefferson County and are presented at the end of this report. Specific direction for the preliminary design was re- ceived from the Urban Drainage and Flood Control Di strict, and a copy of the specific directive is reproduced in Section V. The selected pl an for the study area resulted from evaluation of alternative plans presented in the Phase A Report by the City of Golden and Jefferson County. Prel iminary designs have been prepared in sufficient detail to pl an bridge and channel improvements, floodproofing and other structural measures, and to identify flood hazard areas for floodplain management and preservation/regulation. The Preliminary Design plan specifically includes: The long term plan combines bridge improvements at Ford Street and Washin9- ton Avenue with a IOO-year capacity grass-lined channel. The short term or interim plan includes floodproofing measures at City owned municipal and publ ic buildings, structural improvements at the water treat- ment pl ant berm, and minor struc~ural improvements at the Ford Street and Washington Avenue bridges. Owner flood proofing measures and flood in- surance are encouraged for privately owned structures within the floodplain. A Flood Awareness Campaign is recommended for public education regarding the Clear Creek floodplain. o Graphical presentation of prel iminary design of adopted pl an on 22" x 34" pl an and profil e myl ars (reduced herein). o Detailed cost estimate for the proposed improvements. o Detailed description of each drawing. o A technical addendum to be filed at the UD&FCD Office containing all graphical studies, pl ans, calculations and other supporting material. Establishment of a flood warning system is recommended for the Clear Creek bas into contro 1 the extent and severi ty of damages 0 ue to maj or fl ood events. This Phase B Report is the final product of the Major Drainageway Pl anning effort authorized by Agreement No. 81-2.6 between the Urban Drainage and Flood Control District, the City of Golden, Jefferson County and loi"ight- McLaughlin Engineers, dated June 17, 1981. Reach 2 (Tucker Gulch to McIntyre Street) Flood problems in this reach were analyzed and information regarding flood magnitudes, depths and velocities were submitted to the Adolph Coors Industries in a separate report. Coors Industries is presently reviewing this data and evaluating the potential impact on their facilities. The con- sultant has identified various measures by which flood overflows may be re- duced or eliminated and the estimated costs to implement these measures. SUMMARY OF SELECTED PLAN Specific plan items for each study reach are listed below, while a detailed description of the selected pl an is presented in Section VI. The consultant recommends be reduced or eliminated. improvements may be found the following measures by which flood overflow may Further details and locations of the recommended in Appendix C. o Raise the Vasquez Street bridge to provide at least 2 feet of freeboard above the 100-year flood water surface, and remove the Crawford Street bridge, the power building footbridge and the greenhouse footbridge.