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<br />LOCATiON <br /> <br />Kennett Drainage <br /> <br />County Road 136 <br /> <br />Detention Reservoir <br />Inflow <br /> <br />Detention Reservoir <br />Outflow <br /> <br />Alley Betw~en Poplsr <br />and Elm Street. <br /> <br />Elm-Elbert Strcet <br />Inter.ection <br /> <br />Concrete &ox Culvert <br />Inlet at Banner St. <br />and Kiowa Avcllue <br />Intersection <br /> <br />* Downstrcam from Con- <br />cr<lteBoxC"lvert <br />Inlet <br /> <br />Pine Ridl';e Draina?,~ <br /> <br />Elm-llobilc Street <br />Intersection <br /> <br />Upstream From Elm- <br />ElhertStreetlnter- <br />."ction <br /> <br />TABLE-7 <br />PEAK FLOWS AI SELECTED LOCAIIO~S <br /> <br />REFER,:NCE <br />LlNESTATlOl: <br /> <br />DRAINAGE <br />AREAS (Acte.) <br /> <br />" <br />d. <br /> <br />94 <br /> <br />140 <br /> <br />" <br /> <br />n <br /> <br />" <br /> <br />20 <br />(6g) <br /> <br />4! <br /> <br />" <br /> <br />'w <br />d. <br /> <br />"4 <br /> <br />190 <br /> <br />, <br /> <br />n <br /> <br />94 <br /> <br />20' <br /> <br />20 <br />(s1) <br /> <br />" <br /> <br />" <br /> <br />'50 <br />d. <br /> <br />>07 <br /> <br />315 <br /> <br />7 <br /> <br />53 <br /> <br />CHAPTER X <br />HYDRAULIC ANALYSIS <br /> <br />QIOO <br />d. <br /> <br />The hydraulic analysis entailed computation of water sur (ace profile. <br />along the study reaches of the major drainageways within the Town of Eliaa- <br />beth for the 5-, 10-, 50-, andlOO-year frequency flows. <br /> <br />41+50 <br /> <br />8LO <br /> <br />94 <br /> <br />159 <br /> <br />'" <br /> <br />70 <br />(107) <br /> <br />87 <br /> <br />59 <br /> <br />'" <br /> <br />The topographic mllpping, with a scale of I-inch equal to 100-feet and <br />2-foot contour intervals, was provided by Elbcrt County in cooperation with <br />the To",n of Elizabeth. The mapping was prepared in 1976 and does not reflect <br />current development in town. However, recent aerial photography and field <br />surveya were used to reviae the map. .0 neceasary along the stream study <br />reaches. Extensive revision wss necessary in the detention reservo.r area <br />and .n the south"",stern portion of town ",here fieW residences are currently <br />under construction. <br /> <br />29+15 <br /> <br />156.5 <br /> <br />'" <br /> <br />'" <br /> <br />'" <br /> <br />280 <br /> <br />Channel crosa aectiona were field surveyed at specified interval_ along <br />the study reach. Water surface profiles were determin~d u.ing the field aur- <br />veyedcroa"section., theroughne..coefficientaofthedruinage....ys, and the <br />conveyance churacteristics of culvcrts and .treet overflow section.. The <br />hydraulic characteri.tico of the otudy reach wcrc determined on a n"",berof <br /> <br />28+45 <br /> <br />156.5 <br /> <br />28' <br /> <br />170 <br />(ll5) <br /> <br />fieldinve.til\atioll'. <br /> <br />Photograph. of typical sreaS are presentcd on Pagcs <br /> <br />21+00 <br /> <br />165.5 <br /> <br />38 through 40. <br /> <br />100 <br /> <br />Each of the drainage cond"irsllnd structurcswcremeasuredalld the c apacity <br />was determined. At ::>ost strect cro.sings, flood flows are conveyed by a C<>nl- <br />bin<lcion of culvert How and .treet overflow. Rating CUrV,," were developed <br />for each cross.ng to determine flow depth assuming thst existing drainage <br />structures were operating ~fficiently. Detailed hydraulic analysis of the .torm <br />.ewer on Kiowa Avenue was al.o performed. Th~_ rating curve for the .torrn Scwer <br />allowa the overland flow on Kiowa Avenue to be determined. <br /> <br />18+00 <br /> <br />213.9 <br /> <br />u, <br /> <br />n,e ",ater $urface devation. for the 5-, 10-, 50-, snd 100-year frequency <br />flood. .....rc computcd u.inS the Corps of .:ngin"er$ HEC-2 Step Backwate~ Compu- <br />ter program. The capab11ities of thi~ program are explained in the Running <br />Creck floodplain study p"rt of thi_< rcport. Addicionalcomputation.ateach <br /> <br />10+00 <br /> <br />222.6 <br /> <br />, <br /> <br />'rhe n..",bc. in p"r"nth".i. i~ th~ cHim,,-b>J ilu,,", in tile storm s"wer. <br /> <br />9~00 <br /> <br />225.3 <br /> <br />9+50 <br /> <br />25.2 <br /> <br />1+00 <br /> <br />33.7 <br /> <br />-<'7- <br /> <br />-48- <br />