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Flooding problems within the City of Florence are aggravated by the restriction of drainage channels by vegetation growth and accumulated debris, plus siltation of major culverts under the D&RGW railroad tracks and street drainage problems. 2.4 Flood Protection Measures There is very little flood protection for the City of Florence. In the 1930' s, Coal Creek was lined with concrete slabs, grouted in place to form a concrete slopewall lining both sides of the creek. The line portions of Coal Creek extend from the Denver and Rio Grande Western Railroad on the south to 5th Street on the north. The slopewall was capped with a 3-foot floodwall. This channel, however, is capable of conveying only minor flood volumes through the city without exceeding the capacity of the channel and bridge structures over the channel. Dry Creek, a right bank tributary of Oak Creek, conveys floodwaters through Florence in a northerly direction. This stream, lying between Oak Creek on the west, and Coal Creek on the east, enters the City of Florence at approximately the Denver and Rio Grande Western Railroad and Frazier Avenue, and enters the Oak Creek channel at approximately West Eighth Avenue, just north of the City of Florence corporate limits. The Dry Creek Reservoir, constructed in 1970 by the Soils Conservation Service (8CS) has provided substantial relief from floods originating in the Dry Creek Basin. The Dry Creek reservoir has 0.50 square mile of tributary drainage area. Prior to construction of this reservoir, short duration, high intensity, summer thunderstorms caused extensive damage to roads, schools, homes, and business establishments in the City of Florence. The reservoir will contain the runoff from a storm approximately five times the volume of a IO-year frequency storm. Peak flows from the local area below the reservoir will be contained in the outlet channel and be through the basin by the time the maximum peak flow, from the principal spillway occurs. Various agencies have performed minor channel cleaning and riprapping along Coal and Oak Creeks, but no extensi ve flood control work has been performed since the 1930' s. In 1974, congressional authorization was given to the U.8. Army Corps of Engineers to investigate the feasibility of certain flood protection measures for Oak, Coal, and Chandler Creeks in Fremont County, Colorado. Preliminary investigations carried out by the U.S. Army Corps of Engineers have included site investigations, hydrologic studies, and hydraulic ananlyses of each of these three flooding sources. Specifically, the project proposals include flood control dams on Coal and Oak Creeks and a diversion darn on Chandler Creek. None of these flood control - 4 -