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<br />cL\XJJ ~IIUAT 10'1 <br /> <br />Development in t~e FlOOd Plain <br />The population of LyolIs expanded 36 pe~cent during the 1960's. <br />At the same ti~e there has been en increase In number of nomes along <br />St. Vrain Creek in tne rural areaS. Opportunity lor expansion in Lyons <br />is 11mitoo due to the relatively steep sidehills bordering the t"o <br />stream canyons that converge there. Commercial expansion has been in <br />the nature of supply houses and small businesses located out of the <br />flood plain. Future commercial developments are more likeiy to be to <br />the east of Lyons where th9 land is flatter. There..-Tllcontirneto <br />be pressure to build In the flood plain at Lyons duo to these space <br />reSTrictions plus the attraction of living ne",r tho STream. hble 2 <br />lists population trends fo~ Lyons <lnd Boulder County from 1950 to 1970 <br />according to U. S. Census BtJrO<lU figures. <br /> <br />Sourcos of Uah arrd Reco~ds <br />Tne J. S. Geologic~1 Survr.N ",,,int<llns a sud<lce WJt(lr recorder <br />go<;" on St. ',rain :::re<~k at Lyons. Tr.e ~i!~e h 10Ciltod 1ownStrrN'" Iron' <br />tne conf IJonGO 01 ~.orth ~nd SOJ-:-."1 5t. 'Vrai n CreekS and "JS J drai huge <br />dred of 219 s~uare rr,ll us. Records are avallao I" for AU!]lJst iS87 to <br />Septemu"r 1391 a"d fr~ Ju~c 1395 to the prose"t. <br /> <br />'1.~ter i J I waG obTa i ned from "CNor di I I and Va I e" by lidrol c H. <br />:lJ n~ i nq, ilnd 'J. S. :::;eo I OJ i ca I Survey ',;ater Supp I y Pil~er 997, "F I oo-j, <br />in Colorado." <br /> <br />1950 <br />1960 <br />1970 <br /> <br />Lyons <br />"" <br />706 <br />9>8 <br /> <br />80~ I der County <br />48,296 <br />74,254 <br />13i,889 <br /> <br />Flooded oreJS i" this ~oport e~e rlotteu on ro,roduGtions of <br />,00.$.C.S. a"ri~1 ~hotogrnphs ",~Je i~ J~ly 1'169. rl<lhiled topoJrapMic <br />napoin9 "hd cro~5 5octi0ll sJrvcys w're o,'ovi,j"d by t.~e Ur~.'a~ [)rai"i,l~" <br />and Flood CQlltr,,1 ='lstrict, tM City ollofl>Jr1ont, anJ Sce;IJe,'County, <br />by cooperil-r-iv8Jgre<..'1lH""t. ThcsewureussdtoCOOl?'Jteflooaproliles <br />emu f loOded ".e~ OJ'll i "~~. <br /> <br />Tilblo 2 <br />POPULATIOOTRENDS <br /> <br />Year <br /> <br />Flood Season a"1d FlOod ChMd:tGri~1ics <br />F 1(I{}(j~ ii< the study r"'iKi1 of ~T. 'ir;]i n Cree~ "sJ<::llv ctcur <br />,," r i rv, t n.. n..r i oc ,.:~v t hr OJ, 1 h 5"0 ter" ~"r . ,'-locl" ~ d i" snm,'"e I 'I i" :~ i <br />~"J June ccntribuhj~ signilicant runoff wt serious Iloodi,,~ (j0<\~ 'lot <br />occ~r Url11;)5~ r.o i nl" II .-,ecornpit-"1 ics T:le 5"0''''le I t. Po,'k f looni ng <It <br />~'1oc':; "" II '.J~""! I\, OCC'lr withl" a few hour', ;lft~,.. ~ ~ingl" r~inbi I <br />"-V"P~. FI()O~i;;,.1 i~ fJ:.:ncnlly ,1f S'lcr-t de;r~ti()n bUT '""y b,> p,'olor"-iBd <br />5i'J~ i t iCJ"tl'y' by ';no'~,"(>1 t rllnott. <br /> <br />" <br /> <br />7 <br />