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Snowmelt flooding is characterized by moderate peak flows, large volume of runoff, long <br />duration, and diurnal fluctuation of flow. Flooding from general rainfall alone, though <br />uncommon on the Yampa River, is characterized by high peak flows and moderate duration of <br />floodflows. Ice jams can occur at bridge crossings and channel constrictions where flooding can <br />occur from otherwise non - damaging flows in areas ordinarily only affected by much higher flows. <br />The jams can reduce channel capacity so much that the small flows cause significant flooding. <br />Additionally, ice jams can release stored water without warning when the jams fail, causing a <br />destructive wave to move downstream. Rain on snowmelt floods result from the augmentation <br />of already high snowmelt flow volumes by the added runoff of rainfall. These types of floods <br />can be characterized by the already moderate peak flows of snowmelt floods followed abruptly <br />by a short duration high flow. <br />0 <br />