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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 Plllln .......................... <br /> <br />FloodSltuatlon............................................., <br />SourcesofDataandReco..ds............................. <br /> <br />Flood Season and Flood Characteristics .................. <br />Fllcto..s ~ffectlng Flooding and Its Impact ............... <br />Obst..uctlons to floodflo\ls .......... ............... <br />Floodda""''lttreductlonmeasu..es.................... <br />othe.. factors IInd thttlr Impllcts .................... <br />Flood\larnlngandfo..ecastlng...................... <br />Flood fighting IInd emergency evacuation plans ...... <br />Materlat sto"lIge on the flood plllln ....... ......... <br /> <br />Past Floods................................................ .. <br /> <br />Su""a..yofHlsto.-lcaIFloods............................ <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 />^ugustI951........................,............... <br />JutyI976.......................................... <br />Futur(lFloods......................................:......... <br /> <br />frequency............................................... <br /> <br />HllzardsofLllrgeFloods................................. <br /> <br />Floodeda..8IIsandfloodd_ges.................... <br /> <br />I <br /> <br />CONTENTS (continued) <br /> <br />Paqe <br />< <br /> <br />Obst..uctionstofloodflows ......................... <br /> <br />1 <br />1 <br />, <br />, <br />, <br />9 <br />9 <br />9 <br />10 <br />" <br />" <br />" <br />" <br />" <br />" <br />I< <br />I< <br />" <br />" <br />" <br />" <br />" <br />17 <br /> <br />Velocities of flow................................. <br /> <br />Rateof..isellndduratlonoffloodlng.............. <br /> <br />Glossary of Te....s <br /> <br />............................................ <br /> <br />T~8LES <br /> <br />Table <br /> <br />Big Thompson Rive.. Basin Vicinity <br />CllrlllltologlcalD-/lta .........................,..... <br />2 Stream'''''llngCkl'hl................................. <br /> <br />3 ~nnual Peak Dlscha..ges for the Big <br />ThompsonRlverN6arDreke......................... <br /> <br />4 ^nnu~11 P8IIk DIsc~rges to.. the Big <br />ThompsonRlverNea..laSalle...................... <br />5 SUrm\ll..yof PertlnentOlseharges tor <br />theBlgThoIT'IpsonRlverBasln...................... <br />6 floodPlalnRefe..enceDllta,BlgThompson <br />River, Weld County, Colorado ..... ................. <br /> <br />PHOTOGRAPHS <br /> <br />Fll1u..e <br /> <br />, <br /> <br />81g Thompson River. looking downstream f..om the <br />Lerlmar-WeldCounfy line {reference pOint 491 ..... 4 <br />Big Thompson River. Looking upstrea", f..Of!' Weld <br />eountyR""d 17CreferencepOlnt74l ............... 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 downstream f..om <br />COlor-lido HlghwlIY 257 (reterence poInt 102) ........ 5 <br />Big Thompson RIVer. Looking upstream from <br />Weld County Rolld 25 (r!lfe.....nce poInt 125) ......... (; <br /> <br />" <br /> <br />, <br /> <br />19 <br />19 <br />20 <br /> <br />, <br /> <br />5 <br /> <br />I; <br /> <br />P&qe <br />" <br />" <br />" <br />" <br /> <br />Paqe <br /> <br />, <br />, <br /> <br />" <br /> <br />I< <br /> <br />18 <br /> <br />21 <br /> <br />Pa!'le <br />