<br />Jrldges
<br />
<br />Across tho Stroams
<br />, -,
<br />
<br />study reach~s, In a~l!itIQn to ~hf) ~rid~o$, c?n~ult$ <Ire Js,.:1 t?
<br />conv~y the f ImlS ,m<!er till, streots. ,;1 II I~rr.(!tt,. Avenue crosses
<br />LI ttlo Dry Creek ~y ~ ford, llo"ovor, in ']",,'eral, condu i t c~,',lC;i tie,
<br />dn, considerably less thu the bri~q\ls. Tabies 2 +~reu')~I 4 preS\ln~
<br />pcrtln\lnt "le'l~ti(m5 for t,'I" structuros il"J ,hO',.' th}ir rel"tions,ip
<br />to tre I ntermod i ato ""'~ ional flood. no" p I"ns an': p~ot i les on plates
<br />2 ~hrOL1S' 14 SMw t,e 1100<1 potential ~t eoch street, hjghw~y, and
<br />r~llro~d lir"lo, and tho estimiJt~J dlects of tro bridges upon p~s5age
<br />of th" I ~termedi(lto RO<J len,,1 and Standa~d Project FIDOGS, Flood
<br />potential Is also Indicated t>y tho cross scctlons, plates 15througr
<br />17, sho'.ing depths dnd widths atspeclllc locat1ens.
<br />On t>oth Big and LittleOry::rook5, t>ridgesoftheOerwer
<br />ar>d Rio Grande 'i"este~n i1a1lrO<ld and ~,tchi son, Topek" and Santa Fe
<br />Ral I'"(lY <;ross the streQms near thai r mo~ths and '"o~ Id P~s5 discharges
<br />eq~al to' o~ greate~ th~n tho Inter~edl~to Flood. The ~150 In water
<br />5urld<;e is not sulflcient .to I nundate the t~ac~s "'I"" under StandiJrd
<br />Project Flood COr"ld I t Ions. No rei I I ~OiIJS cress ::;rocnwood G~ I ch.
<br />
<br />I\rapahoe i<oaa. Trese In<;i~de ~esIJ()ntlal "rcas r;orn of Araoahoe
<br />!load, scattered d()velop",ent~ lOrtl' 01 Orchard dnd CI~rkson St~oets,
<br />" shoppl n<J center, 1 i I t~atll)n ~ lant, school bu 11 dh~s, a cnurch, "!"wo
<br />;lar", are~5, tre En~,'le.'ood play]reu~.J und rr.~jer unci ,"in()~ h;"~,,..clYS
<br />~nd streen.
<br />
<br />He '"~jo~ "u",ugeaQle It,,,"s I~ toc Llttlo ::;~y C~eek II00d
<br />p lu i n ~re locate~ Iro'11 Green'.'ood 'J111~ge to the ,"euth ef Lltt Ie jry
<br />Crcuk, TllGse IncluJe blJsiness and residential bulidlngs in Eng lew(>od ,
<br />~e5 i dentia I oeve lop'1ents j n su~urb,,,, Eng le.~(',QJ, Cherry III lis ",unicl pa I
<br />bul Hing, " church, a larg" portion 0.1 the r:hAr~y Hi 115 golf cO'Jrse,
<br />theHighllneCandl,dnd th"City'Jltch.
<br />
<br />Twenty-.sixstreetsandhlg>,way,cro.sstnethr"estre",",s
<br />onl>rldg!}5,Sl)Vonstrectscrosc,ovorcondLJ;ts,<1ndenll"tJI ord,
<br />II II ~erve the b~si n necd5 pro',' id i r>J Jccess to CGvelep"d ~~e", Or
<br />con'leyi ng U. S. ~nd St~t" Illgrways JCress tne "~tershejs. Bridges e~
<br />tn~ [;,<,,,- dr I"r i."" i n ~I''''er" I, "dVlJ <:d""O; Iv tv I"'~S the I nl.,r'"ed idle
<br />i\egio.r~ I C lood or gr.ucl t"r j; schdry,'j ~n" he d~prodc:w5 ;ore i nWr"luated
<br />only Oy tJxrru1\<'l tloo"~. In t"e rH,",' i "inq streets, Tn" l)ri"10S can
<br />pa',;s d 15Ch,,~;,"s ~~ng I n9 frOM these ~i th a 2 ocrcent Jnnua i chanco 01
<br />OCC'.J~r""Cf1 M the Shnd.'rd f'~0:",ct FIIX'd. l<rr~"'lCV'~ to t""!"s<:>
<br />st~<Jctu~()S dra usu<llly ~t ~ 1000'er eiuvaf'I\l.1 thdn t'!oJ bri dc;o c",ck, a,d
<br />are t I cod"d betore I I ()'ii5 roac>1 t~e ,,~eo~s i d~ ef the ~)r i dJc, ,0, I I
<br />brid~;e5 ':~~SB u ~"cklr<2-:;O d~rlnf] the hi_lher JISC~"'"NS ~h;d", Con-
<br />
<br />Ot>struct10ns to Flood F IQ'~
<br />;~(ljor 005'fructions to f Icod f 100~s are the ~O<las and
<br />b~id~"" These r"strlct tlows, causlnq thn .~~'h:Jr to ~Ise on th1l
<br />\~ ps t roam S I de u r, t 11 oVer toP? I "J Q I the st r wetu re Or road I I M I t5 the
<br />
<br />re~hi"tlvH i>ff"ct. fj"ad I"ss"s .h~O.,J]~ t"" t"'idJ"~ '"ere ce"ruto~
<br />
<br />by "!"ho method de,er i bed i n "HyJra~ lies 0.1 i)~; doe \,.."ter,,~ys," by t~e
<br />D I 'I i <; I,,~ 01 f.'ydra~ II c Rosearch, Bureau 01 PUb I i c RoaJs, 1960, ]o,'r.Or"l
<br />
<br />tri but"'~ to' t:,,, 11<:>0w i n~ of r',c ap"~O"C'les. The C'J l'Ier"!"s, ~i pes,
<br />)"J cond~it,; ,Jre sl,nd to pJ% J~O"t cl16.1nol capJci ty. wit" qre"t"r
<br />j I sch~rges overtopp i ng th" roaGs. ~r"l. the IO"'Ar reJc'l of Li tt 10 Il~Y
<br />CrH'~, d conc~lt, passes unJ<lr two streets ~nd ~ large ShO)pi"lJ C0nt,,~.
<br />Tw.olva b~ld~e" Ir"lcludln~ ho rn.ajor l,i9~'"ay (;~OSSi"g5 an~
<br />t,~" ~~I l~niJ" t~idG~s, cress Dig :.)~y Crc('k ,.ltl,ln tl", ~tLJdy ~CClch,
<br />
<br />b~idgcs :!nd ilp~r"'1cc, reads .",.r;; ,~v",rt"I)D"d, II,,, ","b~~kr'''''nh ""re
<br />conslJ~rod as broad-crested weirs, Tle ollecrs of t~ose le~~ns n~
<br />tho wnt.,~ s;J~face p~cli los J~e sho'.'n On Ill"tes 10 thre~gh 1401 this
<br />~nport, I n cases .'I\O~G b~ idgc oecni ng~ er cu Ivcrts dr" smJ I I rola-
<br />tlve to' t Inr,,1 I lows Br"ld sWbJ'lct t<) b lockag" hy dehrl~, the aSSJm;:tl(1n
<br />wJS made that w,1"!"er p.~',;,ages 'lre I nef Iec"l vc oJur; r>g t~e majer II ooJs.
<br />
<br />Ni"e~"en bri~cles, i~ciudinJ .'.0' "",.;or ~1::;lwa'i ~nd two r<liiro<lc brld0es,
<br />~ro.ss Littl" xy wrll;;~ ~nd if. t,"lb..~~ry, ~~e"n,"=~ ;;'JI~~'., ~.Ithin the
<br />
<br />"
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<br />20
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