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<br />Croll Section Locallon'
<br />
<br />69.760,70.262.70.538,70.840,71.692,
<br />71.974.72.416,72.74.1, n.ln, 73,504.
<br />73.757. n961,74.238, 74.421,74,571,
<br />74,921.75.117.75.361.75.834,76.012
<br />76.495.76.910,76.997,77.234,77,397,
<br />77.760,77.901,78.122.78.541
<br />?d,nO.78.940
<br />79.199,79.461,79,662.7>1.85:3.80.062,
<br />80.173,80.359.80,599.,80.823.81.041.
<br />81.24.1.81.419,81.518,81.798.82.048.
<br />82.173.82.383.82.476,82.613.82,774,
<br />82.931.83.133.83.213.82.235.83,268.
<br />83,::t2!i.8:,1.:161,H.>,380.1'l3.a90,fj:l,:195
<br />
<br />'"
<br />1.670
<br />2,940
<br />4.,980
<br />
<br />",470
<br />
<br />!i.870
<br />
<br />a,\l20, :;,940, !\%O. 6,0['(), 6.0j)n, 6,18n
<br />6.420,6,650,6.710,6,740,6,760,6.871),
<br />7,45\1,11,1):1(1,11,19\), 1I,2()\), /<,l\HO, ~.IlD(I,
<br />II),nO, 10,790, 10,820. 10,900, l1,4.~O.
<br />12,790,14,020.1-1,930
<br />
<br />OBSTRUCTIONS
<br />
<br />TABLE 3
<br />
<br />Katllral obstrllction'\ to floodflow inelude
<br />trees. brush. and oth(,r wln'tation j("rowinj(
<br />ulonj(" streams. Durino: floods. vt'll"~tation
<br />imlX'd~s flood flow lInd reslllt_ in b,,~kwakr
<br />conditions and in~roas~d flood hoij(ht~, Hru~h
<br />or trees wa~lwd uul durinl{ rh.,t; and ~:<rri~d
<br />down,tcc'am enu]d ~oll~et 00 bridlf~s or oth,'r
<br />obstructions, thus creatinj(" a damminj(" effecl
<br />aml uverbank flow, As floodf]ow increases.
<br />masses 01 dehrig can dn:<troy abridw'()rcatl"<'
<br />water le,'dsto ris~ hif(herand moro rapidly
<br />than normal. thlls <,r()llin~ and dama!>:in!>:
<br />ablltments, apprna~hes. and the overlying
<br />roadbfd,
<br />In wnera1. nb~tru~tiono r{',trict floodfl"w,
<br />
<br />PEAK FLOWS
<br />
<br />P..,k Flow (euhie feet per serond)
<br />10-V..,r Sll-Vnr 100_V..r SOO.V.er
<br />Flood Flood Flood Flood
<br />
<br />ANIMAS RIVER
<br />
<br />10.500
<br />
<br />18,50n
<br />
<br />40.500
<br />
<br />24,000
<br />
<br />10,500
<br />
<br />19,100
<br />
<br />24.600
<br />
<br />4.1.500
<br />
<br />10,500
<br />10,000
<br />
<br />25.000
<br />23,000
<br />
<br />TABLE 4
<br />
<br />19,500
<br />18,000
<br />
<br />42,(1()()
<br />:19.000
<br />
<br />and mayca\"eowrbankf]<),>;g.unpre-di~table
<br />ar('a._ of flood;n!>:, possible damao:e te or
<br />de,trUdion of hridge, and ntb,'r stream
<br />('r""lngs, and lnereas('d velocity of flow
<br />imme-diately downstre<lm. Thn~ bridwo
<br />('.l"Dsoinjl; lIermm;a Creek and on,' bridl!e
<br />~ro",ing the Animas Ri,'er ~ompri", the oll]Y
<br />manmade ob,tructinno \0 floodflow in the
<br />study "rea, l'~rtin"Iltdiltil nn these structure,
<br />are,howninTable4.Th"effe~tofubotructioo"
<br />m"yl"'o<..,noo Plate<2ij,29.and:11. Water
<br />surface ele"ation, shown rdled the as<ump'
<br />tionthatbrido:~op<minl<srllm~inunob';trllcted
<br />hy flood borm. d~brig Or deposit,; of "and am]
<br />sediment.
<br />
<br />OBSTRUCTIVE BRIDGES
<br />
<br />Elevation'
<br />Topor
<br />Roadway'
<br />
<br />100"y~ar
<br />Flood
<br />
<br />$OO-year
<br />Flood
<br />
<br />KERMOSA CREEl<
<br />1.\100 2,000 2,100 2.2(~J
<br />2.000 :UOO 2,2{~) 2,:11)(1
<br />2.200 3,300 :J,500 ;l,60\l
<br />2,200 3.400 3,60\l 4.()()()
<br />~.21l0 .1.50fj 3,600 4.100
<br />2,200 .>,6()() 3,SOO ,1.7()O
<br />2,200 3,600 3,800 4..~OO
<br />2.200 3,600 4,400 6,aO\l
<br />
<br />Idenlification
<br />
<br />Locallon'
<br />
<br />Under-
<br />Streambed clearance'
<br />
<br />ANIMAS RiVeR
<br />
<br />Gra\'~1 I'it fWad
<br />
<br />~2.44
<br />
<br />f;7n1 6714
<br />
<br />6715
<br />
<br /> HERMOSA CREEK
<br />Pen,.er & WoGraTJ(;" 5,\I.jf} (\1;2'\ '\(;:'-1 Ijl;:)I; t;!;;,,!
<br />Weet<.'rn Rai]road
<br />v';,,~t Ani""" Road 1l.740 I""v.: '\'.4:': l,f",1 fil;.17
<br />('rivaIR A~ce<s Road 10,~2(1 (;70l\ 6711; (j71H 1;717
<br />
<br />1i,\7
<br />
<br />oj\:l
<br />
<br />'\!,;l,~
<br />
<br />';1>18
<br />
<br />671~
<br />
<br />, At '"" U;bl",'.m fa,',.,,! th,' m",'lIlr<' "''''''I'' '''' t,,~ '" m",j,.,,,,j, ~,"".!f<1 ,,, teA' """",,, r,,~, ~a,"mal ,,,,,h'[,, \",,,,,.1
<br />jlo".,,,, I'I~~ ,~jj"""-",",,
<br />, 'li1" "'''V~''''', rc,,,,, """'" "" '''(' ,bi,.,,,,,, 1\;,,,,, f"" Ul',\[',',m' (",,,, ".,,,,,,h .',,, )jm,",,,,, Cc"',,
<br />. I,,,,, "",'; ,,' '''''d~""i,,' <l" """d''"',',
<br />A",.o",'"""I""',)!r"".lj""Md;"""""'",".'L"',j"",[('",,,,","1";'"
<br />
<br />, \LI" "ph".'''' {r"", ",,",U, on '.I", ,~"i",., R"'eL r"d ..,,,ON'.'" ~""" "'""",Ii ,," II",,,,,,,,,, c,...,
<br />
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