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<br /> TABLE 4
<br /> OBSTRUCTIVE STREAM CROSSINGS'
<br /> El...lIO<l'
<br /> Un<l<.' Topol lOO.ye., 500-y."
<br />l<fonllllc.llon Loe.lIon' SIt".mho<l elu,.noe' 1I0.<Iw.y' Flood Flood
<br /> COLORAOOI\IVER
<br />GronJ Av~nuo (~"'l<
<br />Hj~hwa~ 3,\0),
<br />W..IWL<ndl..:mos :lil5..';:1 4'>:18 4559 ,1562 4.%3 4;;[,,;
<br />EOSIwundLao"" :1ll5,5G 4538 ,1559 4562 ~bf,~ ~:;S6
<br />ORGWRR .'!&i.7I 45'1f> 'If,ll6 4510 4f,1;3 ~f,ll:,
<br />"tb SUwt(t:,S, f,o):
<br />Nurt"boun<lt...nt'. :18G.8:1 4;;~~ ~i;7U 4;;75 4J(~ 4O&i
<br />Southbouodl"""" a~;.~4 4JOU 4r.65 4572 '''' ~"67
<br />32 Road 39.1.05 _1606 ~62fi 4f,1O 46~1 4629
<br /> LEACHCREH
<br />R;vorRoad. 2,040 4fi32 45~0 4.\-l~ ~J43 4r>4.',
<br />ORGWRR t,lIIO 45:14 ~541 4:>1,> 4;'~~ ~J46
<br />U,S.lIigilway6i5U. 2,410 4536 ~5~2 '"' 4545 'M'
<br />6/50Fronla>t<JRMd' 2,1;25 ~536 iSH ~S4S 4.->'iS 4547
<br />24\>Road' 9,890 '''' 4S74 4S75 4574 4574
<br />25 Road' 12,530 4m6 41>87 ~S9! 4J90 4!;W
<br />M.inLinoGrand
<br />V.lI.yean.1 13,6.10 4584 4594 4599 4593 ,1.;94
<br />G\-lRoad. 19,130 4627 "" ,,~ 46~0 ~640
<br />!-70f'ronlal!<' Ro.J' 19,540 4638 46~~ 41i61 '"00 4661
<br />26Rusd. 2l.330 ,,~ 4659 4662 ~",,4 4667
<br />"'^"" 22,570 4f,1;f> 4~7t ,~ 4685 '"%
<br /> ~EWISWASH
<br />"".. 2,070 ~610 '"~ 4622 4621 462:;
<br />O"Ro<.<:! ~,730 462'J 4633 'M' 4639 ,1642
<br />F,Ro.d 7,:170 ~644 46,;'; ,~ 46,,7 166\
<br />Grac.dV.ne}-C3MI H,\2(l 46~1 4664 46ft! 1663 1670
<br />r,rg, Hit""'~~ "iN 9,NW ~~~.~ 41174 ,1~lK .1MII 4M7
<br />'""Road 1O,0.~0 4672 ~5g2 1685 '1fi8~ 4686
<br />F\iRo.d 15,470 4737 H.~ 41:;0 n,17 4752
<br />In:<."ota,.70' 17,&10 1762 H6~ H7~ 4770 4779
<br /> HORIZON ORIVE CHANNEL
<br />P,iv.teCco..ic.ll"" 9,200 4fiSO '''" ,,~ 4591 4.';91
<br />Pci..t<Cc",",iol!"" 9,7;0 4~8 4594 ,1>95 4t,% ,If.96
<br />26 Road" 10.400 459'7 4604 '"~ ,,~ \~07
<br />26\iRo.d. 13.450 4,ag 4028 40;:14 4ti:l5 46:10
<br />~lain Lin< Grand
<br />Val:~y Car,.:' 14.~O 4G:W 1635 1:11:1 1635 \~~'1
<br />GrandV.lIel'HLKh.
<br />lineCan.l' lUOlI ,\64" 4649 4,;;,j! .16'i:' ,11~iil
<br />HocioonDri,,' 16.540 4648 46.~3 -1(;57 ~';60 4661
<br />27 Road. 17.440 46.>7 ,~, toW 4670 4671
<br />C'^"" \9.9LlO 46AA '"~ ,,~ 4703 ~7Q.l
<br />L C,I..",,,,, d";.",,,,1 1,,'
<br />, A' :h, "pM,..",," r".. of,h., '''','''"" ,"CO',"~ r,- lor <tl ,,,,,,I~.", "~""-<l:,, the ,~,,~. r.., """", "'" Iml """"'
<br />'~,,,,"."'t~'.,, t"m lA'" """"" ^"",,", ,", ,h" ".1.".", ",,"", r,~,""""""" ,,,.. ",0"""" ,..h"",, ",,"",'
<br />'1""....,I"I<>..."""""",,,,,,,,,,",,,,..'.I"'",",otb,,,,,,,,,,,,",,,,",,,T,,,,.,,,,,,,,,,,,,,,,,,j.,"'""_",,,,'<,<',.""
<br />,""',"'"
<br />'AI '0""'" ".. ,',","l i"",~Ii,,," ....,'. ,""'n~""",, ,."n',
<br />
<br />VELOCITIES OF FLOW
<br />
<br />!)urin>:a IOIl-y"arf]md, avera,-;,','elo<.'iti.."
<br />of fiow in main cbanncl and overbank an""
<br />
<br />would be as "hmvn in Tahh' 5.
<br />
<br />TABLE 5
<br />
<br />AVERAGE VELOCITIES OF FLOW
<br />100-YEAR FLOOD
<br />
<br />Stream
<br />
<br />ColoradQlti,'er
<br />Gunni~u[l River
<br />u,ach Crefk
<br />UOri7.011 Dri\'~ Cbannel
<br />Lcwi~ Wash
<br />
<br />'~""wd"ok f]",^"
<br />
<br />Velocity
<br />(feet per second}
<br />MaIn Channel Overbank Areas
<br />
<br />,," 2.4
<br />6,8 ,
<br />8-7 l.~
<br />:)-5 ,
<br />6
<br />
<br />In ~h~d flow' areas, ve[ocit;", would ran...t'
<br />from 1.;) fed per ,,,,-,nnd, In ",'me localizt'd
<br />;tr"am ",'aches, down~tre"m from natllrsl or
<br />m:'nmad~ obstructions, for ~)(ample,
<br />vd,,,-,iti,'" of flow C(luld siJ<oiIicantly excm_>d
<br />th,,,,, "I1OWn in Tabk [), Velocity of flow
<br />durin>: a 5UO-year flood would be RI;~ht[.v
<br />luv;hcr th~o durin" a HlO-\'e"r flood.
<br />Waterflowin~atarat.eof7f"etper"ee""cl
<br />
<br />FLOODED AREAS
<br />
<br />Th"ar~a.<lhatwotlld Iwinundal<'<J hyth.'
<br />WI)- and 5O!)'y"ar noods are shown on Plates
<br />2,57, As ma,' be ~'€n from tho~c platcs. the
<br />[I)I)-year flood on tbe Colorado and Gunnison
<br />It,,','rs would I><' wnf;noo w lbe Immediate[y
<br />adjac~"t overbank arl'as. Colorado River
<br />flood flows will inllndat" bottom lands along
<br />th~ north sid" of th,- riv<'rand sandbari"land,<
<br />;m1necli~tdy Ilpstream from Grand Jun~tion,
<br />Tht, cnnm1t'reially d~,'eI"Pt'd nn'a [lear thc'
<br />
<br />I',o"d, "":1,,',,, 0'~d"r,d n,,~, ~,',~'"tJy i"" ,ltan ~ !.-., d,",p
<br />
<br />,
<br />
<br />or ~reater will cause severe eroS;OIl of
<br />,trcambanks and ;, ~apahl~ of trao"PrJrtin"
<br />[arJl<'rocks,Streamhanb~nd tb,' rill "round
<br />bridge ab\ltments may he ~r<~I~d and hrge
<br />amount., "f "ravel. sand. a"d "ill may he
<br />tr~nspt>rte(i hy wat,'r f],)Win;,: al a rat~ or ,>-7
<br />ferl]l<'fSP"ond. Waterflow[,wal.ah,,"t-2f('d
<br />lwrs"cond or Ie"" will d"PO;;1 sand,sdt. and
<br />other d~hris,
<br />
<br />Fifth Btr..ct bridl{cs and Ih~ re,jd~ntial nr"a
<br />""ar Ri"prsid" Park would be t-hr.,atenL'd by
<br />the high flows of the Colorado Hivpr,
<br />t'loodf]ows can back inw thp Connpet-ieut
<br />l....k..,areatothesouthofthpriver,,," well a.,
<br />into thc lower rCClCh of 1-."0 ThoroughfaN'
<br />Canyon. The high~r flows On th~ Gunni,on
<br />R;v"r would flood a~riniltural :<rea"
<br />"p"lrPRm from tbe mouth,
<br />
<br />\0
<br />
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