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<br />Colorado Flood Hazard Mitigation Plan -1999 <br /> <br />rapid on small (and steep gradient) streams and slow <br />in large (and flat sloped) streams, <br /> <br />The causes d floods relate directly to the accumula- <br />tion d water from precipitation or the failure of man- <br />made structures. such as dams or levees. Floods <br />caused by precipitation are further classffied as coming <br />from: <br /> <br />. Rain In a g&nrH'lll stann syst&m <br /> <br />. Rain In a localized Intense thunderstonn <br /> <br />. Melting snow <br /> <br />. Rain on melting snow <br /> <br />. Ice Jams <br />Rainfall and melting snow in Colorado's seven river <br />basins feed four major river systems d the westem <br />Unrted States, These river systems are the Missouri, <br />Arkansas, Rio Grande, and Colorado river basins, <br />These basins encompass many small streams and <br />rivers as shown in Figure 2.2, <br /> <br />Note: One of the recommendations <br />of this plan is to inventory the struc- <br />tures and people in Colorado's <br />floodplain. This inventory, when <br />completed, will enable planners at <br />the state and local level of govern- <br />ments to plan and mitigate the flood <br />hazard. <br /> <br />I <br />I <br />I <br /> <br />I <br /> <br /> <br />I <br />I <br /> <br />Precipitation in each basin is related to the seasons <br />and two major sources d moisture. Sunvner showers <br />and thunderstorms that occur from June through Sep- <br />tember primarily are caused by moisture from the Gu~ <br />of Mexico or the Pacific Ocean, During the fall. occa- <br />sional general rainstorms and thunderstorms occur <br />from wet and warm cyclonic air masses That move in <br />from the southem Pacific Ocean, Winter and spring <br /> <br />I <br /> <br />I <br />I <br />I <br /> <br />UM' IOJ" <br /> <br />lor <br /> <br />,09' <br />4)" -r- .. <br />, <br /> <br />.or <br /> <br />101' <br /> <br />106" IOS' <br /> <br />----- <br /> <br />". <br /> <br /> <br />.. <br /> <br />". <br /> <br />II' <br /> <br />109' <br /> <br />'01' <br /> <br />,or <br /> <br />Chapter 2 - 2 <br /> <br />. <br /> <br />... <br /> <br />I <br /> <br />19' <br /> <br />I <br />I <br /> <br />I <br /> <br />18' <br /> <br />I <br /> <br />-..-- <br /> <br />-...- ).,. <br />101' <br /> <br />I <br />I <br />I <br />I <br /> <br />106" IW <br /> <br />104' <br /> <br />101' <br /> <br />Figure 2-2 <br /> <br />111 roS::lOPM <br />