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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />TABLE N-2 (Continued) <br /> <br />Reach Location <br /> <br />ALTERNATNES INVESTIGATED - LITTLE DRY CREEK <br /> <br /> Alternatives Examined Frequency <br />a. Existing condi tion <br />b. Grass-lined channel 2 thru 100-yr. <br />c. Concrete-lined channel 2 thru 100-yr. <br />d. Detention facility 2 thru 1 OO-yr. <br />e. Non-structural 100-yr. <br />a. Existing condition <br />b, Storm sewer 2 thru 100-yr. <br />c. Concrete-lined channel 2 thru 10O-yr. <br />d. Concrete-lined channel 2 thru 1 OO-yr. <br />e. Concrete-lined channel 2 thru 100-yr. <br />f. Non-structural 100-yr. <br />a. Existing condition <br />b. Storm sewer 2 thru 100-yr. <br />c. Concrete-lined channel 2 thru 100-yr. <br />d. Non-structural 100-yr. <br />a. Existing condition <br />b, Storm sewer 2 thru 10O-yr. <br />c. Detention facility 100-yr. <br />d. Non-structural 100-yr. <br /> <br />AlA 76th Avenue to 80th Avenue <br /> <br />AIB 80th Avenue to railroad track <br /> <br />AIC Railroad track crossing to <br />Detention Dam <br /> <br />AID Detention Dam and upstream <br /> <br />N- 4 <br /> <br />Remarks <br /> <br />Floodplain zoning without modifications to existing channel or culverts <br />Channel improvements for entire reach and culvert redesign at all crossings <br />Channel improvementS for entire reach and culvert redesign at all crossings <br />Construct detention dam north of 76th Avenue between railroad and Sheridan <br />Boulevard <br />Flood warning; flood proofing. <br /> <br />Floodplain zoning without modifications to existing channel or culverts <br />Construct storm sewer for lower 1,200 feet of reach <br />Channel improvements for entire reach and culvert redesign at all crossings <br />Channel improvements for lower 1,200 feet and culvert redesign through <br />80th A venue crossing <br />Relocate channel along entire reach to northeast side of railroad tracks <br />Flood warning; flood proofing. <br /> <br />Floodplain zoning without modifications to existing channel or culverts <br />Construct storm sewer for entire reach <br />Relocate channel to northwest of homes on Turnpike Drive and culvert <br />redesign under U. S. 36 <br />Flood warning; flood proofing. <br /> <br />Floodplain zoning without modifications to existing channel or culverts <br />Upgrade underground storm sewer system to contain the 100-yr. flood <br />Upgrade existing detention facility to accommodate flow (affects down- <br />stream reaches) <br />Flood warning; flood proofing. <br />