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<br />cost for this oike incluoin9 spillway, cutoff,ano orainage structures <br />is $ 819,000.00. <br /> <br />i>ioneerl'arkOam <br />ASJl1dll oam<lno resenoirwoulGcontrol the IOQ-year5andCreek <br />flood. We assumeo a multi-pur~ose structure, ~hich would serve as a <br />recreation area when not needed for flood control. Estimated cost of <br />this structure is S 3,277,260.00. <br /> <br />SUM~ARY OF PRI~ARY DRAINAGE IMPROVEME~TS <br /> <br />Service <br />Area <br /> <br />location of <br />Existing or <br />Proposed <br />Outfall <br /> <br />Description of <br />Proposed?rimary <br />Improvements <br /> <br />Estimated <br />Cost <br /> <br />Benefit/Cost Analysis <br />The project cost is some $ 4,000,000.00 for the 2 structures. Average <br />annual flooo damage reduction is S 370,000.00 if the structures werebuil t. <br />Assuming 7 percent money, <lnd a lDO.year project life, the benefit cost <br />ratio is 1.29 for regional flooocontrol. <br /> <br />Iris Drive at <br />Highway 6 <br /> <br />60-1nchoutfall; <br />to South Platte <br />River and trunk lines <br /> <br />$1,619,271.00 <br /> <br />1 <br /> <br /> Sugar Factory ReplaceSterl1ng <br />Drainage Ditch NO.2 ditch crossing <br /> and other improvements I 40,950.00 <br />Approx250 ft. Ash5treet <br />south of So. Front reliefllne <br />and Poplar Sts. I 203,655.00 <br /> Second5t.at 54-inch outfall <br /> Higftway 138 toSouthOlatte <br /> River S 844,087.00 <br />No. Division Ave. 66-inclloutfall <br />at Fr~nl<.l in St. to Pioneer ~itch <br /> and trunk lines Sl,263,780.DO <br /> <br />Master Orainage Plan <br />For the drainage analysis, we subdivided the City of Sterling into <br />11 service are~s. Areas 1 through 5 are served ~y outfalls whiCh disci1arge <br />into the south Platte River. Outfalls from areas 6 through 11 oischarge <br />into the Pioneer Ditch. <br /> <br />3 <br /> <br />4 <br /> <br />Sto~ S~'er System <br />The existing storm sewer sys~e"" regional flood problems, topognpr.ic <br />constraints, and recommendations for jmprove~ent in ~ 1957 engineering <br />study were considered in developing the ~aster Drainage Pl~n. ;he <br />drajnage facilities summari~ed below are o~sic elements that woulo <br />improve the efficiency of the entire system. In some of the service <br />areas. the proposed facilities would result in ,as1cally a n~ drainage <br />system. For others, they would supplement existing fadl itie;. Esti~ated <br />costsSuITlllar1zed in the following table are for the basic elements of <br />eachimprov€mentsuchastrunkanOoutfal1lines. Not included are costs <br />necessary to totally complete a given project such as the number of <br />catch basinS, laterals, and necessa~y ,treet improvements. <br /> <br />8 <br /> <br />?ioneerOitch <br />The Pioneer ditch generally follows the old Sand Cre~1<. Channel to <br />the South Platte Ri'ter. For many years, the ditch has served itspurP<lse <br />well as a drainage ditch. The grade and alignment of this channel was originally <br />iii <br /> <br />i, <br />