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<br />snow, but convective thunderstorms also cause frequent and hiKh <br />runoff flows of short duration. AU. S. Geological Survey (USGS) <br />stream gaging station on the White River, 2.5 miles upstream from <br />Meeker, has been in operation every year since 1910. The records <br />from this galling station show that the larllest yearly peaks occur <br />in the late spring and early summer with Lhe periods of hiKh rllnoll <br />from melt in!! snow last inK from 2 to 3 mont.hs. The 1arllesL recorded <br />annual flood occurred on June 16, 1921, from melting snow. The <br />recorded flow was 6,370 cubic feet per second (cfs), which is the <br />magnitude of a flood occurring once in 100 years. Damage resulting <br />from that flood consisted of inundation of low lying meadowland <br />adjacent to the White River and a washed out culvert bridge. Other <br />years of high water were 1957, peak flow of 5,220 ds; 1952, 5,200 <br />ds; 1901, 5,000 cfs; and 1917, 4,940 ds. Mr. Dick Lyttle, <br />retired publisher of the Meeker Herald, said that ice jams that did <br />form near Meeker during the winter months were routinely blasted <br />without complication and that there were really no floods on the <br />Whi te River that he could recall in which the water rose above <br />Water Street. <br /> <br />2.4 Flood Protection Measures <br /> <br />There are no Federal flood control projects affJrding protection <br />for the Town of Meeker and none are under consideration. <br /> <br />3.0 ENGINEERING METHODS <br /> <br />For the flooding sources studied by detailed methods 1n the community, <br />standard hydrologic and hydraulic study methods were used to determine <br />the flood hazard data required for this study. Flood events of a <br />magnitude which are expected to be equaled or exceeded once on the <br />average during any 10-, 50-, 100-, or 500-year period (recurrence <br />interval) have been selected as having special significance for <br />floodplain management and for flood insurance rates. These events, <br />commonly termed the 10-, 50-, 100-, and SOD-year floods, have a 10, 2, 1 <br />and 0.2 percent chance, respectively, of being equaled or exceeded <br />during any year. Although the recurrence interval represents the long- <br />term, averaRe period between floods of a specific magnitude, rare floods <br />could occur at short intervals or even within the same year. The risk of <br />experiencing a rare flood increases when periods greater than 1 year are <br />considered. For example, the risk of having a flood which equals or <br />exceeds the 100-year flood (1 percent chance of annual exceedence) 1n <br />any 50-year period is approximately 40 percent (4 in 10); for any <br />90-year period, the risk increases to approximately 60 percent (6 in <br />10). The analyses reported herein reflect flooding potentials based on <br />conditions existing in the community at the time of completion of this <br />study. Maps and flood elevations will be amended periodically to <br />reflect future changes. <br /> <br />4 <br />