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<br />Snowmelt flooding is characterized by moderate peak flows, large volume of runoff, long <br />duration,and-diumal 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 /> <br />8 <br /> <br /> <br /> <br /> <br />~/ <br /> <br />c5 <br />t.l <br />t:: <br />i;;) <br />o <br />ll:: <br /> <br />------- <br /> <br />- -, <br />L, <br /> <br /> <br />8 <br />E... <br />~ <br />~ <br />~ <br /> <br />~ <br />~ <br />~ <br /> <br /> III ] III <br /> .j..> 's ~ <br /> c .., <br /> .... III <br /> 0 e <br /> Q.. ... ~~ <br /> U >. <br /> 'Gl <br /> .... - <br /> <Ie ~i <br />MILK CREfK ~.~ =~ <br /> ~g; l:l:f= <br /> os ~< <br /> I ., ~ <br /> '; <br /> = <'" <br />I cr <br /> '" ~~ <br />.s::: -5 ~ <br /> I ut' .S ;:.U <br /> "'os <br /> &oc ~ '" !il <br /> c <br />I c c 0 <br /> = .- ~ <br /> o ..l < <br /> ::l= >. ~ ~ <br />18 c- :;l <br />~.Ul 5.e- o <br /> CIS e.... U Q <br />18 =uu~ < <br /> ~ I. l:l: <br /> 0 <br />l:.t I S <br />I~ U <br />I~ <br />I <br />I <br />I <br />I <br /> <br /> <br />010 <br />Z C\ <br />~ ~ <br />o 0 <br />><I....l <br />[:?; 0 <br />u <br /> <br />q~-1/q <br />~-Y~ <br />~J' <br />~?t <br /><// <br /> <br />s~ <br />~ <br />~~ <br />~ <br />. ~'f <br />