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FLOOD02442
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FLOOD02442
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Last modified
1/25/2010 6:24:28 PM
Creation date
10/4/2006 10:53:44 PM
Metadata
Fields
Template:
Floodplain Documents
County
Rio Grande
Community
South Fork
Stream Name
South Fork Rio Grande River
Basin
Rio Grande
Title
Flood Hazard Study
Date
10/1/1980
Prepared For
South Fork
Prepared By
USDA Soil Conservation Service
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />. <br />I <br />~ <br />J <br />I <br />'i <br />9 <br />j <br />I <br />1 <br />I <br />~ <br />J <br />a <br />/I <br />3 <br />I <br />. <br />; <br /> <br />X-Sec. <br /> <br />0.0.-008 <br />DB~OlO <br />DC-on <br />00-014 <br />OE-016 <br />DF-OlS <br />OG-tno <br />DfHl22 <br />01-024 <br />DJ-026 <br />OK-02B <br />DL-OJO <br />DH-OJ2 <br />DN-034 <br />Do-036 <br />DP-036 <br />DQ-040 <br />DR-042 <br />OS-044 <br />DT-(l46 <br />DU-048 <br />DV-OSO <br />DW-052 <br />OX-OS4 <br />DY-056 <br />DZ-058 <br />DZA-060 <br />DZll-062 <br />EA-064 <br />EB-066 <br />EO-068 <br />EO-070 <br />EI::-072 <br />EF-Q74 <br />EG-076 <br />ElI-078 <br />EI-080 <br />EJ-082 <br />EK-084 <br />EL-086 <br />EM-aBB <br /> <br />::;-090 <br /> <br />Eo-092 <br />EP-094 <br />EQ-096 <br /> <br />Left <br />Over <br />Bank <br /> <br />.OS <br />.OS <br />"",' <br />.OS <br />.OS <br />.085 <br />.05 <br />.05 <br />.05 <br />.05 <br />.06 <br />.045 <br />.032 <br />.045 <br />.075 <br />.08 <br />.04 <br />.075 <br />.06 <br />.DO <br />.05 <br />.10 <br />.10 <br />.OS <br />.045 <br />.045 <br />.045 <br />.07 <br />.045 <br />.045 <br />.045 <br />.05 <br />.045 <br />.045 <br />.06 <br />.06 <br />.06 <br />.07 <br />""" <br />.045 <br />.045 <br /> <br />.~~~ <br /> <br />.045 <br />.045 <br />.045 <br /> <br />HYDRAULIC <br /> <br />Channel <br /> <br />.04 <br />.04 <br /> <br />.0< <br />.04 <br />,045 <br />.04 <br />.04 <br />.04 <br />.045 <br />.04 <br />.0< <br />.04 <br />.04 <br />.04 <br />.0< <br />.0< <br />.0< <br />.0< <br />.04 <br />.0< <br />.04 <br />.0< <br />.04 <br />.0< <br />.04 <br />.04 <br />.04 <br />.04 <br />.04 <br />.04 <br />.0< <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.04 <br /> <br />.04 <br />.04 <br /> <br />.. <br />.", <br /> <br />.0< <br />.0< <br />.04 <br /> <br />ROUGHNESS <br />'10 <br /> <br />Right <br />Over <br />!lank <br /> <br />.07 <br />.07 <br /> <br />.06 <br />.07 <br />.06 <br />.05 <br />.06 <br />,078 <br />.065 <br />.065 <br />.045 <br />.10 <br />.042 <br />.042 <br />.045 <br />.045 <br />.045 <br />.0' <br />.04 <br />.045 <br />.045 <br />,OI,S <br />.075 <br />.08 <br />.07 <br />.04 <br />.05 <br />.08 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br /> <br />.045 <br />.045 <br /> <br />... <br />...."J <br /> <br />.045 <br />.045 <br />.045 <br /> <br />"n"VAt.U1::S <br />GRANDE <br /> <br />X-Sec. <br /> <br />ER-09E <br />ES-IOO <br />EI-I02 <br />EU-104 <br />EV-I06 <br />01<1-108 <br />EX-1l0 <br />FA-1l2 <br />F1H14 <br />FChl16 <br />FD-1I8 <br />FE-l20 <br />FF-l22 <br />FG-124 <br />FH-126 <br />Fl-128 <br />FJ-lJO <br />FK-132 <br />FL-134 <br />FH-136 <br />FN-138 <br />FO-139 <br />FP-140 <br />FQ-142 <br />FR-144 <br />FS-146 <br />FI-148 <br />FU-150 <br />FV-152 <br />FI/-154 <br /> <br />Fro.. <br /> <br />SecA-1 <br />"7 <br />U-120 <br />BC-160 <br /> <br />AP-3 <br /> <br />(MANSINGS) <br /> <br />Left <br />"'0' <br />Bank <br /> <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.05 <br />.05 <br />.05 <br />.045 <br />""" <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />Road <br />.045 <br />.045 <br />.045 <br />.045 <br />.05 <br /> <br />SOUIHFORK <br /> <br />," <br /> <br />Sec C-7 <br />U-120 <br />BC-160 <br />CO-J50 <br /> <br />Channel <br /> <br />." <br />.04 <br />.045 <br />.045 <br />.045 <br />.045 <br />.04 <br />.04 <br />.045 <br />.045 <br />.045 <br />.04 <br />.04 <br />.04 <br /> <br />.04 <br />.04 <br />.045 <br />.045 <br />.04 <br />.05 <br />.05 <br />.05 <br />.045 <br /> <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br /> <br />Channel <br /> <br />.043 <br />.045 <br />.048 <br />.050 <br /> <br />Photog.aphs used <"<) develop d1~Hhed c.oss "e'l"tion data we.e taken <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />June 18, 1975, which was du<"1ng spring hlghw'Iter. no:.: in the main st"", <br /> <br />wa" apptoxlmately 4700 cfs, and 2000 cfs In South Fork. Digitized eieva- <br /> <br />Ri~ht <br />Over <br />Bank <br /> <br />tions in the channel .."r" at "ate~ sudace rather than channel botto",. <br /> <br />The.efore, cross aectioneleVl'tlon. needed adjusting to account fo rr.hannel <br /> <br />.045 <br />.045 <br />.045 <br />.045 <br />.05 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br />.045 <br /> <br />geo..eny below water surface. Thls 3.djust..ent was made by 3.SSul>ins trial <br /> <br />channel depths and computing water surface prof lies until the computed <br /> <br />elevations approdOlated those of June 18, 1975. <br /> <br />The June 18, 1975 dischar8es Were used in these computations. Once <br /> <br />this calibration waa made, diacharges for the 10-, 50-, 100- and 500-year <br /> <br />frequencies ~re used in computing nddltiooal profiles. These discharges <br /> <br />have an average occurrence of once io the number of years indicated. For <br /> <br />.05 <br />.045 <br />.045 <br />.06 <br />.045 <br />.04~ <br />.05 <br />.07 <br />.055 <br />.055 <br />.055 <br />.07 <br />.04~ <br />.06 <br /> <br />example, the 100-year frequency Uood should occur once iolOOyears, 0 nthe <br /> <br />average, and has a One percent chance of being equaled or exceeded in any <br /> <br />given year. <br /> <br />WSP-Zoutput w"s used bdoveloplng flood profile draiollllgs, flood <br /> <br />outHnes a" the flood ha~ard maps and data for the flood frequency-elevation <br /> <br />,~nd discharge tables. <br /> <br />Fload autlines for the 100- and 500-year discharges were located on <br /> <br />flood ha~ard area maps uslng computed wate. surface elevations, cross <br /> <br />section data and by inter!'o!aUan between cross sections. Becau~.. "f th.. <br /> <br />multitude of pouible events in which sediment and debris could ""uae <br /> <br />naod <br />Plain <br /> <br />blockage of bridges and culverts, suchconslderaUonsllerenot1ncludedin <br /> <br />.065 <br />.055 <br />.070 <br />.070 <br /> <br />the study. <br /> <br />Floodway Analysis <br /> <br />The SoH ConservaUonService "Fl.OWY"co..puterprograOlwasusedto <br /> <br />calculate tlood>mys along the matn channels. Tne term rioodway Is defined <br /> <br />( <br />I <br />I <br /> <br />as the mtntmum width at a cross-section that is requIred to ca~ry ~ selected <br /> <br />M-4 <br />
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