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<br />Slide C5. Flash flood in Buffalo Creek, West Virginia <br /> <br />Some floods are flash floods, This shows damage from a flash flood which struck <br />Buffalo Creek in West Virginia. Flash flooding is a very dangerous form of riverine <br />flooding. It typically occurs following intense rain over a short time in a small <br />watershed. The flooding often comes unannounced and the floodwaters are fast- <br />moving and destructive. <br /> <br />Slide C6. Failed dam in Rocky Mountain National Park <br /> <br />Flash flooding can also occur because of the failure of a dam or other water retention <br />structure. Here you see the Lawn Lake Dam which broke in Rocky Mountain National <br />Park. The resulting flood struck the town of Estes Park, Colorado, causing extensive <br />damage. <br /> <br />Slide C7. Floodwater channel in mountainside, Rocky Mountain National Park <br /> <br />This shows the channel scoured by water surging down the mountain following the <br />dam break. The channel, shown here years after the dam failure, is still completely <br />denuded of trees, underbrush, and soiL Inundation maps showing the areas that would <br />be flooded if a dam totally fails with a reservoir at full capacity have been prepared for <br />all "high-hazard" federal dams. <br /> <br />Slide CB. Ice-covered river at Oil City, Pennsylvania <br /> <br />Flooding can be caused by ice jams breaking up in the spring or on warm winter days. <br />Here you see the ice-covered Allegheny River at Oil City, Pennsylvania. As the ice <br />begins to thaw, it breaks into large blocks which begin to tumble downstream and can <br />jam the river channel at natural bends, bridges, culverts, and other constricted areas. <br /> <br />Slide C9. House damaged by ice in Peoria, Illinois <br /> <br />This shows a house in Peoria, Illinois damaged by ice carried in the floodwaters on the <br />Illinois River. <br /> <br />Slide CI0. Alluvial fan adjacent to the Colorado River <br /> <br />Flooding can be particularly severe on alluvial fans-fan-shaped areas formed by <br />streams at the base of mountains or the mouths of ravines where the water abruptly <br />loses speed, spreads out, and deposits sediment. This shows an alluvial fan on the <br />California side of the Colorado River below Lake Havasu. <br /> <br />Script-Task C, page 2 <br />