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<br />'50,000 <br /> <br />120.000 <br /> <br /> 00,= <br />. <br />! <br />. <br />" ~,= <br />, <br />. <br />, <br />, <br />.- <br />" <br />d 20,000 <br />, <br />. <br />. <br />! <br />Q 10.000 <br />, <br />, <br /> 5.000 <br /> <br /><,= <br /> <br />1,000 <br />, <br /> <br />Table 3 <br /> <br />E,c..d<"". ~"qu""" P., ""no,," V.q" <br /> <br />Peak Discharges At Selected Locatlons <br /> <br />m <br /> <br />" <br /> <br />, <br /> <br />, <br /> <br />< <br /> <br />50,000 <br /> <br />< <br /> <br /> , <br /> , <br /> , <br /> / <br />A'~anS<ls River 01 "Io.e~ce,;f' <br /> I/L../ <br />LV I <br />v. A,"ansasRive'OICononCily I <br />... <br /> I I I <br /> <br />Peak Discharges (cfs) <br />:.O-year lOO-year <br /> <br />Drainage Area <br />(Sllllaremiles1 <br /> <br />SOD-year <br /> <br />10-year <br /> <br />Location <br /> <br />20,000 <br /> <br />ArkansasRlver <br />at Canon City <br />at Florence <br /> <br />3,117 <br />3,546 <br /> <br />8,850 <br />11,000 <br /> <br />16,500 <br />21,000 <br /> <br />20,SOO <br />28,000 <br /> <br />32,200 <br />71,000 <br /> <br />00,= <br /> <br />~,= <br /> <br />For a detailed description of the hydrologic analysis, refer to the <br />Albuquerque District Corps of Engineer's, "Flood Plain Information, <br />Arkansas River Basin, Florence, Colorado," (Reference 11. A detailed <br />technical addendum has also been prepared by Camp Dresser & McKee <br />(Reference 101. <br /> <br />20,000 <br /> <br />Hydraulic Analysis <br />Analyses of the hydraulic characteristiCS of the streams in the s tudyreach <br />were carried out by Camp Dresser & McKee to provide estimates of thew ater <br />surface elevations for floodsoftne selected recurrence intervals. >later <br />surface profiles >lere ca1culated using the Army Corps of Engineers HEC-2, <br />step-back >later surface profile computer program. Water surface profiles <br />>lerecomputed for the 10-, 50-, 100-, and500-year floods and are plotted <br />for theArkansasRiver,florence Area, on Plates 3 through 15 in Appendix <br />1, and for the ArKansas River, Canon City Area, Plates 3 through 20 in <br />Appendix 11. <br /> <br />10,000 <br /> <br />',= <br /> <br /><.= <br /> <br />Cross-sections for the backwater analyses uf the Arkansas River ....ere <br />field-surveyed at close intervals dbove and below brldges and culverts 1n <br />order to compute the significant bacKwater effects of theSE' structures. <br />Additional digitized cross sections were secured when the topographic maps <br />were compiled. Locations of the field-surveyed and dig1tized cros ssections <br />are shown on the flooded area maps and the flood profiles. The reference <br />points,lOO-year flood elevations and discharges are also listed in Tables <br />5-1 and 5.11. <br /> <br />1,000 <br /> <br />, <br /> <br />00 <br /> <br />~ '00 <br /> <br />= <br /> <br />,.<o.d."". Inl".O' "V.o" <br /> <br />CO~O~.OOO WAToR CONS,~VATION BOARO <br />~LOREOCE ANO c.o'iOtl CITY <br />r~U'ONT COUNTY, COLO~AOO <br /> <br />Channel roughness coefficients (Manning's"n") for these computations were <br />assigned (In the basis of field inspection of the floodplain area. The <br />ranges of on" values t.or tne channel s and ovt'rbdll~~ df" s"".nMized in <br />Table 4. <br /> <br />Table 4 <br /> <br />ARKANSAS RIVER <br /> <br />Roughness Coefficients <br /> <br />DISCHARGE - FREQUENCY <br />CURVES <br /> <br />"n" <br /> <br />Channel 0.03 <br /> <br />fiGURE 4 <br /> <br />Floodplain 0.025-0.065 <br />20 <br /> <br />p~oPAnE~ 8Y <br />C..MP QRESSER a M"~"~. 'NG. <br />