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I I I I I I I I I I I I I I I I I I I - East Fork Kenneys Run - Existing Flood Hazards Development along this reach is limited to the area between 20th Street and the Jackson/Ford Street intersection. Numerous residential and commercial structures exist along this reach. Upstream of Jackson Street, the majority of the land is State-owned and undeveloped. The Tucker Gulch and Kenneys Run drainageways present uniquely different flood hazards to developed areas in the City of Golden. The Tucker Gulch watershed is the larger of the two drainage basins having a total drainage area of approximately 11.4 square miles. Future urbanization planned for the lower portion of the watershed was estimated to have 1 ittle impact on peak flow rates during major floods. On lower Cressmans Gulch (tributary to Tucker Gulch) some minor increases in peak discharge may be expected from urbaniza~ion. Flood hazards currently exist for certain developed areas along North Ford Street downstream of the State Highway #93 crossing of Cressmans Gulch. This hazard exists primarily due to the limited capacity culvert crossing and the overtopping condition of the State highway. In the lower reach of Cressmans Gulch and the upper study reach of Tucker Gulch, flooding presents only a minimal hazard since no development exists in the 100-year floodplain and dry access is available to properties for emergency services. The East Fork Kenneys Run drainageway begins at 20th Street and ends upstream of the Boys School Road (road to Lookout Mountain School for Boys). The reach from 20th Street to near the intersection of Ford and Jackson Streets is storm-sewered, with Ford Street and the low areas between 20th Street and 22nd Street providing the conveyance area for major flows. Upstream of Jackson Street, an open ditch conveys stormwater between South Gol den Road and the abandoned Interurban Railroad grade. A 24-inch clay pipe outlets flows through the railroad grade. Upstream of the railroad grade and downstream of the Boys School Road, the drainageway intersects with Welch Ditch. An exi st i ng fl ume over the i rri gat i on ditch has been abandoned, caus i ng normal drainage to be intercepted by the ditch. The total length of this study reach is 5,500 feet. In the lower reach of Tucker Gulch from State Highway #58 to its confluence with Clear Creek, the main flooding threat exists. Flooding in this reach, as well as other upstream reaches, is characterized by high velocity flows capable of carrying large debris threatening the railroad bridge to the Coors Porcelain Company and the 9th and 10th Street bridges. The fabri-dam and other facil ities owned by Coors near the mouth of Tucker Gulch and across Clear Creek are also threatened by the direct onslaught of floodwaters and debris. Other factors contributing to the flood hazard include the narrow opening of the 9th Street bri dge and the fl at st ream gradi ent upst ream of the Church Ditch siphon beneath the State Highway #58 overpass. Vivid descriptions of past flood events and damages along Tucker Gulch is included in the flood history section of the FHAD Report. In researching the flood history for Kenneys describing flooding conditions. However, in teri st i cs of the 5.6 square-mil e watershed runoff and hydraulic conditions expected as a Kenneys Run is considered the more significant Golden. Run, only one account was found studying the hydrologic charac- and cons i deri ng the increased result of future urbanization, flooding threat to the City of 111-3