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<br />l)cHi leG ~I: snret fJ-j drC' tne lmprovem<,nts rcq~in2d In r<,~ch I. j:ltn~u~r no dallldges
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<br /><I lC-yeor event on Spring Creek. Channel clearing is required just up~t rea", of the
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<br />2
<br />3
<br />4
<br />5
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<br /> Tdole "
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<br />A1tern~tive 1'5 and#] Design lnfomlJtion
<br /> MinimLJr:1 F1ood'l,jyat'ld
<br />De:;iqn :JiscMrge r1ininum Right-of-l>Iay*
<br /> 5000 of, 215'
<br /> 5000 of, 215'
<br /> 4800 of, 210'
<br /> 4500 of, 200'
<br /> 4500 0" 200'
<br /> 4100 ," 185'
<br /> 3100 of, 155'
<br /> 2400 ," 120'
<br />2300 cfs- 1600 cfsH 115' - 85'
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<br />arc recorJe~ in th is redch, illiprover:'e:lts to the ex isting cdna1s HI' recorr,,,,,nded to-
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<br />g(~ther witl' a pol icy Of separoting irrigation flows fro", r.ninage flo~'s. The design
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<br />fre,:ue~ '1 5€ 1ected \'.'a ~ the 10- year event. 5 i ~hons were des i g~ed a t toe cana I crOS5-
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<br />;(edch
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<br />in9> to h~nd1", nor".a1 irrigation flows with no interception of drdinage flows du~ing
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<br />ShielcsStreetBridge. This is not shown on the:pre1illlinaryde,ignmap"
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<br />Channellnproye<Jentsforreach8aresho',,'nonsheetsP-3, P-4andP-5. Improvelllents
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<br />on sheet 1'-3 inc1udcan i",proyedCll1vert under Drake Ro.ad.
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<br />The culvert reqllired is
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<br />7
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<br />a concret~ box designed for a discharg'" of 24DO cts.
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<br />kprevco'Cnts en sheet P_C include a s~'11] f]ocd~roofing benl next to Uw Georgetmm
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<br />8
<br />9
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<br />co ~ dO"li n i ~1T15 . A rta dYld y pan i s reqlJ i red at t ~Ie cu 1 ver t un dQ rap r i I' a te <:r i YC . T his
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<br />*Based ~pon minilllum ch,jnnel ~cope of 0.5%
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<br />'",ill .,110'", the. flood no'''~ to Pil$~ ()ve~ th~ dri'lew(;y w:lh 1i",ited bJ~"~"t.P.'-,
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<br />u Va~ies, Decreases in upstream direction. see figure 4.
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<br />Cilarlne I i"l~rovel1'e'lts in sheet P-5 iDC] ude a 5iphon ilt the Plea5ant "iI: ley ,jnd LJ'"
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<br />Follo"in~ a Floodphin r'littlagE'men t. Progr~m along wi tl1 (on~tr\,cting a ch,jnnel using
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<br />Canal crt)"5ing at Spring Creek. Thi5 is designe.j to handle nornld1 i~rj9atio~ Ik~s
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<br />th" minimum fT()"n"'~y wiMh~ r,.f".."n.-,,<! .mv". will rrflvirlo.n in(r"~~" ,n ]>n<! >v.il_
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<br /><lith no interception of drJ indg(', flows durinq d 10-ye~r event on Spri ng Creek.
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<br />,
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<br />abl~ for development.
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<br />f1oodwdywidthswitjwutthe5eprovi'iions(Tab1eB) dreyery
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<br />ber.ll i5 requi~d jU$t dc\.mstredel of tne caridI to protect d t'esioer.tid~ "rea fro'" over-
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<br />wide ilOd re~trict ueye1opl'ent d10n9 thp ~tu(\y rEach,
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<br />flows fro,.. the car a 1 croS.,j~9.
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<br />1'],10 [mp1emcntdtion
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<br />InundeveJOP(,UJredsofthestu<Jyreachdndintliererldiningdevelopedared"J
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<br />The reC()~~Ie.lded dfai~d<;:el'dY i"'prcve~'e~ts out1ine~ ca~ be i,"pl~!"!,nted ~5 ore :,w('jert
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<br />f1 00<.lp1<1 in l;J<)na'J~lIient ~ro5rall' shou1 d !Jc jrrplen'~nt('d a, described on po'\(' ,I S
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<br />u"Jer
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<br />or caD be divided intoseverd1 project.. 'IJithin the study limits, all of the pro-
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<br />:; I Cf."'f'd til,.e "I. In fOlllldt ion (1'1 Je%iqn Jiscl'd"ies "nd Illin ill'U'lI cha~"el l'i~ilt-of-~"ly
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<br />po5edimprovementst'leedtobeconstructed,,j1tnoughtheneedforsoneisgredter
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<br />\0 be ,)sed ,j, >'lrl of tllis floodpldin ~'andq~II1~I'L dp;.>nhIC'i i,,'e ;J\'est'n:.ed In T~t,le I';',
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<br />t.hdn (lth"rs. T d~ 1 e 15 1i sts the "~con.,...nded IJriuri ty <H,d llrder 0 f imp 1 en.~n 10 t ion fo,'
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<br />,1phdSl'dscherlllleofcor,structionalangwilhtheestiITIatedco,tforl'ilchpriority
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<br />ite~t,
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<br />_F"_
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<br />-66-
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