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I I I I I I I I I I I I I I I I I I I VI-4 o The Municipal Building o The Library o The Recreation Center o The Water Treatment Plant Filter Building o The Mitchell School and Annex Building Reach 2 (Tucker Gulch to McIntyre Street, Station 744+00 to Station 885+00) Participation in the Federal Flood Insurance program and owner floodproofing measures would be encouraged for the private sector. The cost for the interim plan also includes funds for a Flood Awareness Campaign under which the citizens of Golden would be given information regarding flood hazards along Clear Creek. This campaign would supplement the Urban Drainage and Flood Contro 1 's program of not i fi cat i on of res idences, bus i nesses , etc. which 1 ie in a flood hazard area. The existing 100-year floodpl ain 1 imits remain under the interim plan and must be regulated. The goal of the selected improvements through Reach 2 is to reduce hazard by confining 100-year flows to the channel. To achieve this, the bridge at Vasquez Street must be raised out of the channel zone, while the Crawford Street bridge and the pedestrian bridges at the Coors Industries power bui lding and greenhouse must be removed. In addition, approximately 1,300 feet of the existing channel wall in the brewery area must be raised to pro- vide a minimum of 1 foot of freeboard above the 100-year water surface. A flow restrictor pl ate should be installed at the entrance to the Farmers Hi ghl ine Canal conduit to prevent surcharge of the canal downstream. The tl'oO aerial pi pel ine crossings at Station 859+40 and Station 854+10 should be replaced by underground pipeline crossings. Remedial improvements under the interim plan include the following: Downstream from the brewery area, the south bank of the channel between Stations 822+00 and 829+00 should be raised to prevent overflows. At Station 824+00 the aerial high pressure gas main crossing should be replaced by and underground pipeline. 1. Strengthening of the existing bridge deck tie-down systems, and install- ing flotation prevention venting at the Ford Street and Washington Avenue bridges. These measures will aid against loss of the bridge decks during a major flood, but will not reduce impact forces nor pre- vent overtopping of the bridges by flood flows. In addition to the above measures, the engineering staff at Coors Industries is investigating the impact of lOO-year flood levels on critical facilities and equipment. Further flood hazard mitigation measures will be evaluated with respect to the needs and long range goal s and objectives of Coors Industries. Establishment of an interim Flood Emergency Plan is recommended for the mobilization of personnel and equipment for emergency floodproofing debris removal, etc. The existing 100-year floodpl ain must be regul ated until altered physically. 2. Construction of a landscaped berm along the west side of Maple Street between 9th and 10th Streets will divert initial overflows southward toward the creek. However, subsequent inundation of the residential area by backwater effects will still be possible. Also, the berm could be breached by an event greater than the 100-year flood. Reach 3 (McIntyre Street to Youngfield Street, Station 551+00 to Station 744+00) 3. Overflow and riprap protection at the Water Treatment Pl ant berm down- stream of U.S. 5, due to the critical nature of the berm for maintenance of an adequate supply of raw water for the plant. With the exception of two areas, the floodplain management strategy for Rech 3 is Floodplain Regulation. Downstream of McIntyre Street, an overflow situation at the Coors Transload bridge will be alleviated by removal and relocation of a drop structure to reduce the 100-year water surface upstream of the bridge. At the Denver Water Department raw water conduit crossing a riprap drop structure needs to be constructed under the selected plan to protect these important water lines.