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<br />
<br />II I
<br />I I FLOOD HAZARD INFORMATION
<br />I I GUNNISON AND UNCOMPAHGRE RIVERS
<br /> Delta and Delte County, COlorado
<br />I I APPENDIX A
<br />II
<br />I PEAK FLOWS AND STAGES
<br /> 10,,50,,100_, end SOO-Year Floods
<br />I I
<br />I I Peak Flow (Cubic Feet per Second) I Stage (Feel)'
<br />Cross Section i0-Year Flood 50. Year Flood iDa-Year Flood !SOO.Year Flood
<br />Number' Location' Flow Stage Flow Stage Flow Stage Flow Stage
<br />I I GUNNISON RIVER
<br /> (Drainage Area 5,271.7,050 Sq. MI.)'
<br />I I 3 ." 16,200 4a&4.0 22,000 4865.6 24,700 4866.1 30,900 4867.4
<br />< .93 16.200 4865.1 22,000 4866.7 24,700 4867.2 30,900 4868.7
<br /> , 2.40 16,200 41'l66.8 22,000 4868.3 24,700 4869.2 30.900 4870.5
<br />I I 7 3.55 16,200 4869.6 22,000 4870.3 24,700 4871.2 30,900 4872.3
<br />, 4.86 16,200 4871.2 22,000 4872.4 24,700 4873.0 30.900 4874.1
<br /> 9 6.30 16,200 4873.7 22,000 4674.9 24,700 4875.4 30,900 4876.5
<br />I I ;0 7.59 16,200 4874.7 22,000 4875.8 24,700 4876.2 30,900 4877.2
<br />" 11.52 16,200 4879.3 22,000 4ilSO.3 24,700 4880.7 30,900 4&11.5
<br /> " 12.69 16,200 4881.5 22.000 4&12.3 24,700 4882.8 30,900 4&1U
<br />I n 15.% 16,200 '"'" 22.000 481l7<j 24.700 4M8.6 30,900 4889.7
<br />I n 17.80 16,200 4891.1 22,000 4892.8 24,700 4893.7 30,900 4894.9
<br /> 15 18.37 16,200 4892.2 22,000 4894.0 24,700 4894.8 30,900 4895.7
<br />I 10 19.10 16,200 4893.9 22,000 4895.0 24,700 4895.7 30,900 4896.5
<br />I " 2c.54 16,200 4895.4 22.000 4896.6 24,700 4897.2 ]0,900 4898.]
<br /> " 20.74 16,200 4895.9 22,000 4898.0 24,700 4898.9 30,900 4901.3
<br />I 19 21.35 16,200 4898.2 22,000 4900.6 24,700 4901.7 30,900 4903.2
<br />I 2<l 23.27 16,200 4900.1 22,000 4901.8 24,700 4902.7 30,900 4904.0
<br /> 21 24.23 16,200 4901.6 22,000 4903.0 24,700 4903.6 30,900 4904.7
<br />I " 25.28 16,200 4903.4 22,000 4904.7 24,700 4905.3 30,900 4906.1
<br />I " 25.88 16,200 4904.7 22,000 4905.8 24,700 4906.4 30,900 4907.3
<br />I I 'N>tion,IG.odet;cV<fliuID"um,191<J.djo"mcn'.
<br /> 'On report pl",.,,now;ns flooded.r.., (N<>,. 2.\91 and flood p'ofir.< INo,. 6().nl .
<br />I 'Oi,'an<:. in dwu..ncl. of f.CI up",..m from lh< DMGW Rail",,,d bridge w." of Dcl". GUM'_ R''''' ,orl
<br />I d"""," in ,houland,gl fce'up"'..m frommoulfi,Uncomp.hg,.R"c,.
<br />'A'up",..m.nddown",umr.miuof"ud,r..ch.
<br /> 'A'up'''..manddowm''.aml;m;1!of''udyr.'''".
<br />I I 7
<br />
<br />
<br /> Applo.imate
<br /> Dr.in.se "e.k Flow (Cubic fect per5econd)
<br />Ind..~ Ar..a 10.Year 50-Year l00-Year 500'Year
<br />Point location (Sq. Mi.) Flood Flood Flood Flo>od
<br /> GUNNISON RIVER:
<br />1 At Highway 92 bridgc
<br /> ncarAu"ln 5,271 12,500 17,700 20,000 25,400
<br />, Aboy" mouth of the
<br /> Uncompahgre River S,630 13,SOQ 18,700 21,200 25,700
<br />3 Below mOUlh of the
<br /> UncompahgrcRiyel 6,759 16,200 22.000 24,700 30,900
<br /> UNCQMPAHGRERIVER:
<br />< At the moulh 1,129 3.00<) 4,400 '.00<) 6,600
<br />5 Al Colona Gage ." 3,100 4,400 5.00<) 5,600
<br />
<br />
<br />program HEC-2. 6a~ic crOIS section input was
<br />from sUlVeyed cross section data fumished by
<br />lhe Color.doW'lerComervdlion8oard. Depth
<br />ofwaler in Ihe channel and adj.cent flooded
<br />areal Can be determined f,om the profile~.
<br />Velocity of f10wduting a loo.yea( flood on
<br />the Gunnison and Uncompahg'eRiyerswould
<br />averageaboul 7.ij fcetper:;ccond In the
<br />ehannel.nd4 fe..1per sc<:ondinoyerbank
<br />areal. At mmt stream cro>sings in the sleldy
<br />reaches,velocilY of flow during a loo'year flood
<br />
<br />would be about 10 feet per 'econd.
<br />Waler flowing al10 fee' per second will
<br />cause ,ever.. e(o,ion of channels, deslroy low
<br />wale,ermsings, and uansport large boulders.
<br />Slreambanks and the fill around bridge abut-
<br />ments may be eroded, .nd large volume, of
<br />sedimenltramportedbywalerllowingatarale
<br />of 5-7 fe"lper second. Water flowingalaboul2
<br />feel pcr second will deposit;and,silt,and flood
<br />bornedeb,i\.
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