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<br />The creek carries a large bedload of gravel and cobbles, some of the latter being more <br />than 6 inches in diameter. The capacity of the channel has been reduced by this <br />sediment, In some instances, where channel changes took place during the flood, the <br />original channels were so filled with sediment that nearly all of the present flows are <br />discharging through the new channels, However, the new channels are the old <br />watercourse which was abandonded by the river during previous flood events, The <br />littered condition of the channels, and the increased danger of bank erosion, inundation, <br />and resulting channel changes constitute the present flood problem. <br /> <br />More than one-half of the known damages in the 1957 flood were caused to roads and <br />bridges in the area, with nearly $24,000 of damages being caused to three (3) bridges and <br />their abutments, <br /> <br />Table 1 - Summary of Discharges <br /> <br />Flooding Source Drainage Area Peak Discharges (cfs) <br />and Location (Square Miles) 10-Year 50-Year 100- Year 5(X). Yell: <br />High Ball Creek <br />downstream <br />of Hwy 77 254 5,550 6,375 8,800 9,150 <br />above confluence <br />with Risky Creek 224 5,025 5,975 8,375 8,890 <br /> <br />Risky Creek <br />at confluence <br />with High Ball C. <br /> <br />27 <br /> <br />850 <br /> <br />1,100 <br /> <br />1,350 <br /> <br />2,300 <br /> <br />After several decades of work and dollar investments to address flood problems in <br />Floodville, the immediate threat to human life has stabilized, Other flood losses (public and <br />private property damage, injuries, disruption and disaster relief) continue to rise, and the natural <br />resources provided by floodplains are still being degraded. These two phenomena are due to the <br /> <br />7 <br />