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<br />cost for this dike ~ncluding spillway, cutoff,and drainage structures <br />is$819,OOO.00. <br /> <br />Pioneer Park Dam <br />Asmal1 dam and reservoir would control the lOO.year Sand Creek <br />flood. We assumed a multi-purpose structure, '~hich ""ould serve as a <br />recreation area when not needed for flood control. Estimated cost of <br />this structure is $ 3,277,260.00. <br /> <br />SUMMARY OF PR1MARY DRAINAGE IMPROVE~ENTS <br /> <br />8enefit/Cost Analysis <br />The project cost is some S 4,000,000.00 for the 2 structures. Average <br />annual flood daw~ge reduction is S 370,000.CO if the structures were built. <br />Assuming 7 percent ~ney, and a 100.year project life, the benefit cost <br />ratio is 1.29 for regional flood control. <br /> <br />Service <br />Area <br /> <br />1 <br /> <br /> Location of Description of Estimated <br /> Existing or Proposed Primary Cost <br /> Proposed lmpr<lvements <br /> Outfall <br /> lrisOriveat 60-inchoutfall; <br /> Highway 6 to South Platte <br /> River dnd trunk lines 51,619,271.00 <br /> $u~rFactory Replace Sterling <br />Drainage Oit~h ~.2 ditch crossing <br /> and other improvements , 40,950.00 <br />Approx2S0 ft. AshStreet <br />sOlJthofSo. Front relief1ine <br />and Poplar Sts. , 203,656.00 <br /> SecondSt. " 54-inciloutfa]1 <br /> Highway 138 to SouthP1Hte <br /> River \ 644,087.00 <br />'0. OivisionAve, 66-inchoutfall <br />at Franklin St. to Pioneer Ditcr. <br /> "d tr'.Inklines , 1,263,780.00 <br /> <br />Master Orainaqe Plan <br />For the drainage analysis, we subdivided the City of Sterli~g into <br />11 service areas. Areas 1 through 5 are served by outfalls which discharge <br />into t.hescuth Platte!l.iver. Outfal1s fror:lareas 6 through 11 discharge <br />into the Pioneer Ditch. <br /> <br />3 <br /> <br />4 <br /> <br />Storm Sewer System <br />ih", exis~ing storm sewer syshm, regional nood problelllS, topographic <br />constraints, and recommendations for i;;.prove~ent in a 1957 engineering <br />study were considered in developing the Master Orainage Plan. The <br />drainage facilities SUmMarized below are basic elements that would <br />improve the efficiency of the entire system. ln sOffieof the service <br />areas, the proposed facilities would result in basically a new drainage <br />system. For others, they would suoolementexisting facilities. Esti1lllted <br />C?sts SUrTb"lIari zed i~ the following table are for the basic ele~or.ts of <br />each fw.provementsJchas trunk and outfall lines. Not included are costs <br />~ecessJry to tota l1y comp 1 ete a gi'len proj ect s ueh as the number of <br />catch basins. laterals, and neCe'iSarystreetir.lprcvements. <br /> <br />, <br /> <br />Pior.eerDitch <br />The Pioneer ji teh general1/ follows the oid 5~nd Cree". Channel to <br />thcSOuth?latteRiver. For many years, theditchhdS ser'led its purpose <br />'IIe]1 as a dninage ditch. The grade anc aljg~ment of this channel was originally <br />ii: <br /> <br />ii <br />