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<br />Flows in excess of the design event on the mainstem would thus necessitate providing the project <br />features at the Riverside Cemetery. Alternative No. 5 would decrease the severity of the 100-year <br />flood event in the area west of HWY 6 between 1he Pawlli~e Creek bridge and the Cemetery, but would <br />not eliminate all overflows. In addition, this alternative would provide flood benefits to the community <br />of Town of Atwood. <br /> <br />Alternative No.6: This alternative provides a drainage t100dway upstream of the Town of Town of <br />Atwood that diverts Pawnee Creek to the south, along CR. 29 directly to the South Platte River. The <br />floodway would be sized for the 1 Cia-year storm peak flow and would handle a discharge equal to the <br />July 1997 flood event at that location. This alternative would require crossings for the Pawnee <br />Irrigation Ditch, and both HWY 6 and the UPRR. <br /> <br />Summary Recommendations <br /> <br />All of the alternative projects wen: conceptually desigm:d in adequate detail to provide relative cost <br />and benefit comparisons. A matrix was prepared of project pros and cons. This information was <br />presented to the City, County, and interested citizens. A total of seven public meetings were held to <br />discuss the various alternatives. Several factors were used to evaluate and prioritize the projects and <br />their components. Alternative No. I "No Action" was not acceptable fjrom the Citizen's standpoint as <br />there was generally great concern n:garding the potential f()r future damaging floods. Alternative No.2 <br />was believed to have a technical flaw, in that construction of required freeboard on the levee might <br />increase the level of flooding in the Town of Town of Atwood if a flood of greater magnitude than the <br />100-year design flood occurred. Alternative No.3 "Construction of Darns" was eliminated due to the <br />lack of cost effectiveness and the unavailability of ftmding for projects of this magnitude. Alternative <br />No.4 was acceptable to the City of Sterling, but does not provide any flood reliefto Logan County and <br />Town of Atwood. Alternative No.5 was acceptabk to both Logan County and the City of Sterling and <br />had the greatest overall support. Alternative No. 6 was generally acceptable, (except for the land <br />owners who would be directly impacted by the improvements), but was perceived to have more <br />unknowns that could potentially inc.rease costs. <br /> <br />The weighted scores for each of the proposed projects an.d their components are presented in the <br />following Table with the suggested alternative ranking. <br /> <br />Table 3. Weighted Implem<<mtation Scores <br /> <br /> ALTERNATIVE NO. . WEIGHTED <br /> . .... SCOR~_I-. <br />I No Action NA <br /> -- <br />2 Pawnee Creek IOO-Year Levee 415 __ <br />3 Upstream Flood Control Dams 250 __ <br />4 Riverside Cemetery Channel 370 __ <br />5 Modified Pawnee Creek and 555 <br /> Cemetery Levees -- <br />6 Town of Atwood Channel By..Pass 410 -- <br /> <br />ALTERNATIVE RANKING <br /> <br />6 <br />2 <br />5 <br />4 <br />1 <br /> <br />3 <br /> <br />1-10 <br />