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<br />[ <br /> <br />I <br />I <br /> <br />, <br />, <br /> <br />The second syslCm proposed is ~ 48';'lCh ""wer along Holly A_colle and South Sherman <br />Street (see Orawing 12), This sewer will out(all to the historic Dry Creek No, I channel <br />Icx:mcd SOUlb of Florid. Avenue, <br /> <br />H <br /> <br />LEFT HANO CREFK BASIN <br /> <br />No Muster Plan improvements arc proposc<:l for area., outside of the MSA. Within the MSA it is <br />propo>cdthallhecx;,[ingS-footCMPculvcnatPikcRoadbercplaccdwithabridgeorooxculvcm <br />adequatclysizcdlOconveythefulllOO.ycarflowofLcftH<mdCreck(,eeDraw;ng 11). ThecuHenl <br />floodplain model for Left Hand Creek indicatcs a lOCI-year flow of 4,goo d, <br /> <br />, <br /> <br />EAST ST, VRAIN BASIN <br /> <br />Two-yea' propmed improvements for the Ea.<l Sl. Vrain Ba,in include construction of open channels. <br />a ,mrm .ewer rod a culven (S<X Drawing 10j. A drainage ditch is proposed alon~ the nonh side of <br />the railroad fromappro~imatclyl!OOfcClea'l of Manin Street to the existing 48-i!l<h culvert under <br />the railro,ld. A 48.ioch Monn seweT is propo>IC:d from near Sugarm'Ull.oad to rhe railroad eulv"", <br />The exi,ting railroad euhencapacity will need 10 be increased Ihrough the Jddition ofa 66-inch <br />culvcrt. and the outfall ehannel will need to bc improved to COll\'CY a 2.year design flow of 950 ck <br />Roadside dilche, .long Nonh 119!h Streel Jre propored III C011\"ey 2-year f1ow~ 10 thc SI. Vrain Creek <br />(see Drawing 10). <br /> <br />, <br /> <br />ROUGH & READY BASIN <br /> <br />lmpt<wcmenl' proposed for lhis basin include wasteway. from Ih" Rough and Ready Ouch and <br />r<x,d,ide ditehe, lU Spring Gulch (Ea,t) .191h and lith Avenues. These facilities win allow Ihe <br />majority ofslonn runut'flO be periodically removed from Ih. imgal,on <lruclure., Flow, in the <br />road,ide dilche' along 91h and 171h Avenue. could polemially be conveyed Ihrough Morm "ewe," <br />con'lrucledduringdevclopmemoflhc Union Ba,in <br /> <br />29 <br /> <br />K, <br /> <br />UNIO." BASIN <br /> <br />Allhe prescnllime. Union Basin is largely undeveloped, It is propo..d Ihal as 1m: ba,in i. <br />developed. lOO.year drainage fac,ljlic~ .hould be Construcled. Such facilities will need 10 provide <br />hOlh detemion and ~dequale c<>r1vey~nce c~pJci!y for dc"doped runoff. For exa,nplc. wilh main <br />ch~Mcl de$ign flow, being equal 10 hilwric runoff. t()().ye,,, ',"p,eiry ofrbe Spring Gulch (M.1) <br />ch"'lnel will need 10 be 2.5lX.) ds at Hi~hway 66 and incrca>e 10 3.<JOO cr. allhe LPA boondJry al <br />Counly Line Road, <br /> <br />:1(1 <br />