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<br /> <br /> <br />1..I..BilIj)liiml'i\,sll <br /> <br />".:""':';"':':"'. <br />.'..........." <br />... .w_..".....'..... <br /> <br />Figure - 6 - Flood Recurrence Interoals <br /> <br />any time within any given year. Colorado <br />State law, however, requires that the 100- <br />year floodplain be used for land use regula- <br />tion, as the floodplain concept provides a <br />national standard for the National Flood In- <br />surance Program (NFIP). <br /> <br />;.; TOW.... AND I:ITIIS <br />t::. O.........AGIl ."'SIN .OUND""" <br />.. SOULDIUl COUNTY LlNIt <br />, <br />...\... ST.I.". <br /> <br />Figure. 5 . Le/fhand Creek Basin <br /> <br />The 100-year floodplain located within the <br />town limits of Jamestown has been mapped <br />and is printed in the 1983 Flood Insurance <br />Study (Please see appendix B this report). It <br />is critical, however, for the floodplain resi- <br />dent to remember that floods greater than the <br />standard 100-year flood event may occur at <br />any time and may also exceed projected esti- <br />mates designated by the 100-year floodplain <br />boundary. <br /> <br />Types of Floods <br /> <br />Floods occur on riverine systems. Commonly, <br />a river basin is fed by a hierarchical order of <br />stream channels that convey the normal flow <br />of water from smaller watersheds contained <br />within the basin. Flooding results when the <br />flow of water becomes greater than the carry- <br />ing capacity of the individual stream channel. <br />Rate of rise, peak discharge (magnitude), du- <br />ration, and frequency of floods, are all a func- <br />tion of physical features and weather <br />conditions which contribute to the volume of <br />water in the river system. <br /> <br />Ai; discussed previously, Jamestown is 10- <br /> <br />.......; <br /> <br />,.....:.:..... <br /> <br />LONGMONT \. <br /> <br />TN <br /> <br />5 <br />