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<br />-22- <br /> <br />-23- <br /> <br />The most serious of the flooding problems ~re; 1) the house in <br />the low West Vail meadow at Section 5; 2) ~bove the bridge at Ptarmigan <br />Section 12; 3) the Vail Vi1lageareaupstreamoftheWillowBridge <br />Road foot bridge; 4) ~bove the Bridge Street foot bridge; 5) the <br />bridge below the confluence of Gore and Black Gore Creeks ~t cross- <br />section 64, and 6) at the confluence. <br />The yard of the house ~t Section S in the West Vail meadow area <br />is subject to shallow flooding under existing conditions. However, <br />the re~l hazard to this residence is the possibility of Gore Creek <br />returning to a previous alignment which could increase both levels <br />and velocities of the flood water ~djacent to the house. <br />The bridge at Ptarmigan (cross-section 12) c~uses flooding of <br />the foundation on the closest upstream condominium with some potential <br />for erosive damages. <br />Flooding above the willo~ Bridge Road foot bridge extends from <br />the bridge back to Bridge Street. Flooding occurs at the Covered <br />Bridge Store, the Creekside Building and at the Vail Center A and B <br />condominiums. Figures rV-2 through IV-I; show flooding elevations in <br />these areas. <br />The Bridge Stre~t foot bridge into the village cau~es moderate <br />backwater f100dingagainst the Gallery Building which will probably <br />result in ba~ement flooding with the possibility of erosion. The <br />extent of this flooding may be seen in figures IV-7 and IV-S. <br />The bridge below the confluence at Section 64 has too low a <br />clearance as seen in figure 12. An alternate to replacing this <br /> <br />bridge with a larger bridge is to grade the north bridge approach <br />lower to dllow overflow at a lower flood elevation. <br />The erratic flooding at the confluence of Gore and Bld,kGore <br />Creeks is due to poorly defined, unpredi,table chdnnel 10'dtion. A <br />very high discharge could "choose" an alignment anywhere within the <br />shown flood plains with probable high velocities. <br />Photographs of other minor flooding points are dlso included. <br />Figure IV-l shOws a utility line along the bridge dt Section 3 whi,h <br />could be damaged during a storm. There are several other utility lines, <br />both sewer ~nd water, crossing Gore Creek which may possibly be damaged. <br />Figure IV-Il shows the shallow flooding at the starter house of the <br />Town of Vail Golf Course. Shallow depths dnd slow velocit1es are <br />typical of flooding in the golf course. Plate 25, Section 49.4.1, <br />shows a Golf Course section. <br />Although the extent of flooding is very important. the velocity <br />distribution within the flooded area and the duration of flooding are <br />very important in describing the hazards and potential damage. <br />Water velocities in the main channel of Gore Creek vary from five <br />to fifteen feet per second. Away from the main channel in the overbank <br />aredS, depths are shallow and the velocities will be one to four feet <br />per second. While the overbank flooding velocities may present a <br />serious hazard to persons, they are usually not so high as to cause <br />significant stru,tural ddmage to the shallowly flooded building nor <br />extensive erosion in the meadows. However,themainchannel velocities <br />will result in erosion and transportation of sediment, including <br />boulders weighing hundreds of poundS. <br />