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<br />CONTENTS <br /> <br />P..efllce...................................................... <br /> <br />Background Info....atlon....................................... <br /> <br />Settlemer'lt.............................................. <br /> <br />TheSt..ea..snd Its Valley............................... <br /> <br />Development on too Flood PI...ln .......................... <br /> <br />FloodSltuatlon.............................................. <br />SourcesofDataandReco..ds............................. <br /> <br />Flood Se...son and Flood Characteristics .................. <br />Facto..s ~ffectlng Flooding ...nd Its Impact ............... <br />Obst..uctlons to floodflo\ls .......... ............... <br />Floodda""''lttreductlonmeasu..es.................... <br />othe.. factors and thttlr Impacts .................... <br />Flood\larnlng...ndfo..ecastlng...................... <br />Flood fighting and emergency evacu...tlon pl...ns ...... <br />Materlat sto"lIge on the flood plllln ....... ......... <br /> <br />Past Floods................................................ .. <br /> <br />S"""a..yofHlsto.-lc...IFloods............................ <br />Flood Records ........................................... <br />FloodDesc..lptlons...................................... <br /> <br />June <br /> <br />1921 <br />1923 <br /> <br />.......................................... <br /> <br />.......................................... <br /> <br />June <br /> <br />Septembe..1936..................................... <br />June 1949.......................................... <br /> <br />AugustI951........................................ <br />JutyI976.......................................... <br />Futur(lFloods......................................:......... <br /> <br />frequency............................................... <br /> <br />HllzardsofL...rgeFloods................................. <br /> <br />Flooded.....8IIs...ndfloodd_ges.................... <br /> <br />I <br /> <br />CONTENTS (continued) <br /> <br />P...qe <br />< <br /> <br />Obst..uctlonstofloodflows ......................... <br /> <br />, <br />, <br />, <br />, <br />, <br />9 <br />9 <br />9 <br />10 <br />II <br />" <br />" <br />" <br />" <br />" <br />I< <br />I< <br />" <br />" <br />" <br />" <br />" <br />17 <br /> <br />Velocities of flow................................. <br /> <br />Rateof..lsellnddur...tlonoffloodlng.............. <br /> <br />Glossary of Te....s <br /> <br />............................................ <br /> <br />T~8LES <br /> <br />Table <br /> <br />Big Thompson Rive.. Basin Vicinity <br />CII.....tologlcalo.sta ............................... <br />2 Stream'''''llngCkl"hl................................. <br /> <br />3 ~nnu...1 Peak Dlsch.....ges for the Big <br />ThompsonRlverN6arDreke......................... <br /> <br />4 Annu~11 P8IIk Disc~rges to.. the Big <br />ThompsonRlverNea..laS...lle...................... <br />5 Su.........yof PertlnentOlseharges tor <br />theBlgThoIT'IpsonRlverBasln...................... <br />6 floodPlalnRefe..enceDllta,BlgThompson <br />River, Weld County. Colorado ..... ................. <br /> <br />PHOTOGRAPHS <br /> <br />Fi!lu..e <br /> <br />, <br /> <br />81g Thompson River. looking downstre...m f..om the <br />L...rlmar-WeldCounfy line {..eferencepOlnt491 ..... 4 <br />Big Thompson River. Looking upstres", f..Of!' Weld <br />CountyR""d 17Crefe..encepOlnt74l ............... 4 <br />Blg ihoollpson RIver. Looking do..nstr"am from Weld <br />CIl<JntyRoad 17 (refe..ence point 74) ............... 5 <br />Big Thompson River. lookIng downstre...m f..om <br />COlor-lido HIghway 257 (reterence poInt 102) ........ 5 <br />Big Thompson River. Looking upst"e~'" frOl11 <br />Weld Coun'!'y Ro~d 25 (r!lffJrAnCe poInt 125) ......... (; <br /> <br />" <br /> <br />, <br /> <br />19 <br />19 <br />20 <br /> <br />, <br /> <br />5 <br /> <br />I; <br /> <br />Pllq9 <br />" <br />" <br />" <br />" <br /> <br />Paqe <br /> <br />, <br />, <br /> <br />" <br /> <br />I< <br /> <br />18 <br /> <br />21 <br /> <br />PII!'Ie <br />