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<br />Alternative No.4: This alternative will collect the Pa"11ee Creek overflow and divert these flows <br />directly to the South Platte River in the general vicinity of the Cemetery just south of Sterling. This <br />alternative consists of construction of a berm having an approximate height of 5 feet to the north and <br />west of the Riverside Cemetery. This berm would collect and prevent flows from the Pawnee overflow <br />from entering the City along the HWY 6/Railroad embankments. Included in the alternative is <br />lowering of CR. 24, construction of a channel with a concrete floodwall, a closure structure for HWY <br />6, construction of box culverts under the railroad, a siphon for the Sterling No. I Ditch. and <br />construction of a trapezoidal channel to the South Platte River. This alternative is sho\'m on Figure 10. <br /> <br />Alternative No.5: The proposed alternative will provide a conveyance: structure at Town of Atwood, <br />increasing the bridge capacities at tile mainstem of Pawnee Creek, charmel cleaning, (debris removal) <br />and stabilization measures upstream of HWY 6 to CR 29, and the project features of Alternative No.4. <br />This alternative consists of construction of Altemative No.4, along with modifications and new HWY <br />6 bridges, channel and levee improvements downstn:am of the UPRR at Town of Atwood. Flows in <br />excess of the design event on the mainstem would thus necessitate providing the projel~t features at the <br />Riverside Cemetery. Alternative No.5 would decrease the severity of the 100-year flood event in the <br />area west ofHWY 6 between the Pawnee Creek bridge and the Cemetery, but would not eliminate all <br />overflows. In addition, this alternative would provide flood benefits to the community of Town of <br />Atwood. This alternative is shown on Figure 11. <br /> <br />Alternative No.6: This alternative provides a drainage floodway 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 lOO-year storm peale 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 arId the UPRR. This alte:mative is shO\vn on Figure 12. <br /> <br />1II-10 <br />