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<br />STUDY AREA DESCRIPTION <br /> <br />St~~ Resch Description <br /> <br />The frenc~ Creek drainage basin is located in the northeast corner <br /> <br />The atudy reach is centered aoout the city of Holyoke, ~th the lower <br />limits extending "bo~t two miles east s.nd about One :nile west or the city <br />(eeeIndexMs.:p,,,late2). <br /> <br />Drainage Baein Characteristics <br /> <br />of the Sta.te in Logan, Sedgwick, and Phi111pa Counties. Its headwaters are <br /> <br />within Logan County about 20 miles west of Ilolyoke. The creek flows in an <br /> <br />The basin divides into tyO eub_basins at the vest edge of Holyoke. <br /> <br />The flood plain of FrenChman Creek within the study reach is rether <br />flat, Which hes encouraged development. Most of the urbanized development <br />within Holyoke borders the south bank of the creek, and with this urbani_ <br />zation, the flOOd hazard to the community will continue to increase unless <br />adeqUate floodplain regulations are adopted. <br /> <br />easterly direction draining into the Re:publican River near Culbertson, <br /> <br />Nebraska (aee Baain Map, plate 1). <br /> <br />The North Fork has a drainage area. of 164 aquare milea. The combined con- <br /> <br />tributing drainage area for Frenchman Creek is 227 milea at U.S. Highway 385. <br /> <br />Drainage patterns of Frenchman Creek basin consist of low hills <br /> <br />Obstructi~na to flood f1o~s vithin the study reach inclUde natural <br />obstructicns such a~ br~h and other vegctat~on growing along the stre~ <br />banks !llld mll..'\-lnSd" obstructions such as bridges, road embMkments, build- <br />;"', "0' ,"'''A__'. D.'"1~ .., ... _.. <br />.......~. " ~ ..I': .uOC,,!!, ""eae obstrud,ions ilJ1PSde nood flows <br />I!.lId cause backwater co"ditio~s ~'"-~ 1 <br />.. """"" TJla:t ncrease the flood heights upstream <br />01' the obstruction and increaoe velocities d.o\ll'lstree.m of the obatruction. <br /> <br />dividing the waterway... The larger waterwa,ys have well-de.r1ned channels, <br /> <br />while the sma.ller oneS are only .. awll.le bet"""n dra.1nage divides. '!!Ie <br /> <br />basin i~ elongated in Shape vith its major drainage flow patterna 1n a <br /> <br />vest to CalIt direction. Ground elevationa vary :from... maxi= of 4500 f'eet <br /> <br />above National Geodetic Verti,.' ".'... (- ,_.. - ) 1 .." '- ~ .. <br />.L" 0_ """, .u.'..,. n ."e"ea"W"'.ers <br /> <br />The climate of northeast Colorado h aellli-a.rid, with hot, dry aUlllll\ers <br /> <br />Three bridge obstructions exist in the flood plain of Holyoke. ~ne <br />fir.t tvo are the Interocean Avenue (U.S. Highway 385) and Burlington <br />Northern, Inc., railroad bridges and embankments. The third ia the Denver <br />Street (U.S. Highway 6) bridge at ~he eaat edge or Holyoke. During times <br /> <br />to 3700 ft., N.G.V.D. at Holyoke. <br /> <br />and cold winters. Moist air currents from the Gulf or Mexico are the pri_ <br /> <br />Pr..c1pitationintheformoflocal1tedandshort <br /> <br />nign flood flo'~, theee bridges can CaUSe a backvater effect upstre~~ <br />Of tho structu.re. TheDenverStreetbridgew111causell.dividedflowarea <br /> <br />mary source of moisture. <br /> <br />" <br /> <br />duration ~hunder"torms &Ccou.~ts for ~uc~ of tbe total annual precipitation. <br /> <br />a1~B the ~orth side of the roadway due to the baekwater effects of the <br /> <br />, <br /> <br />, <br />