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<br />FLOOD SITUATION
<br />
<br />Table
<br />POPULATION TRENDS
<br />
<br />SOURCES OF DATAANO RECORDS
<br />
<br />ThO United Statns GeologIcal Survey ~lint~ins ~ gaqin~ st~tion
<br />on the Cache la mudre River three ~iles down"tre~m trom Greelev ~~ut
<br />
<br />Year GreolllY :ttl1.C'ounty
<br />1930 12,203 &5,097
<br />1940 15,9<<5 &3,747
<br />1950 20,354 &7,504
<br />19&0 26,314 72,344
<br />1970 38,902 1l0,297
<br />1980 55,000 125,000
<br />1<<90 75,000 180,000
<br />
<br />25foetdownstr'klmlrQr1thebrldqowhich isloc<lte<1tothe>authwestol
<br />W"ld County '~u<lkip"1 Airport, Data for this q3qe is ava liable lor 'larch
<br />to October 1')03, August to No:womber 1904, January I<<I~ to Decemh"r 1919
<br />andJunel924tothupresont. .Addltlonalrncordsolpastfloods><ere
<br />obtained from ~wsnaper files, historical dncuments and Corps of Enqineers
<br />llood records. Th.. NOAA NatloMI 'IIN,ther S<)rviceoHic" provided infor"",.
<br />tion on their methods of flom! lon><:astlnq.
<br />
<br />The l",.imer-,I..ld Re<1lonal F'laMln~ CO'1I'I11S510n provided topoQraphlc
<br />rMpoinq and CmSs sectional inform,ltion frornll..rial oootoqrapns"",de in 19n.
<br />The enolneerln<1 d..partments ot W..ld County and tho city 0/ Greeioy provid~d
<br />brldqecr"s,; ',(lctional infor"",tlon In Ign, TheaE!rial poot<Xlral>hs used a,
<br />a hilS" lor th" f I()()d'd IIr,," ,,"p~ '~<!r" f lo'~n In Ju iy l'l'iq.
<br />
<br />-LOOD SEAi..O'J AND F_l,.OOO_ CHARACTE'1ISTIC5
<br />
<br />f'a,jor flood Inq On tno Clehe I,~ Poudre "I vcr i n t!,,~ study reacn
<br />""Iy OCC~r from "ay to Sf,f't"",:'"r. Flood; nq In the study r"'1ch Is USu" Ily
<br />tr.e re5ul I of i ntons" r1l infllll wi tn rx>ss ible added Ilmount", of ~1Itor fro...,
<br />5rKJwme!t in .~,lY, June, and July, Sta<1e5 can rise fro", normal flo~ to ..xtreme
<br />Ilom!oeaks inl to 4 df>Vs, !-l1(1hst;l(1escanbeexoectE!dto last lor several
<br />
<br />days.
<br />
<br />fAcror~s AFFECTING FLOOD I fiG ~NO ITS I'WACT
<br />--~-- -~~--
<br />
<br />C~~trJctio~~ ~o ;~"od ;Ic"~ - 1:.Jt~rJI o~~tr".~'fion~ ~c f~ccd t:o~~
<br />
<br />illc ludu Irees, ~ru5h and oriler vooelat ion Gro"inG a lonq the strea", blln~s or
<br />in the flood olain. "br-mdoe encro."chments eitiler ovo. the river, such as
<br />bridges, or bulldinqs in t~, 'load "lain can al,o create ~rn &xten~ivll
<br />f 1'1<'0; n~ th,n .'0!J I.j ,-,tl><>r,..1 ,e n"~"r. <err"sent.,t ive ",,~trUGt i()~, "0
<br />
<br />f I God f I()"" .1r<1 ';ho"." in ~ ;'lur.e" I H.rnuoh q
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