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<br />South 12th Street 30' x 60' Bridge <br />South 9th Street ~ 35' x 60' Bridge <br />South 8th Street Improved Inlet <br />South 7th Street ~ 35' x 70' BI"i dge <br />South 6th Street - 30' x 60' BI"i dge <br />South 5th Street 8' x 15' Box Culvert <br />South 4th Street - 7' x 16' Box Culvert <br />South 1st Street 10' x 10' Box Culvert <br /> Main Street - 10' x 10' Box Culvert <br />North 7th Street 10' x 10' Box Culvert <br /> <br />These proposed structures would replace the exist-ing culverts and <br />fol1ow the existing alignment everY\1here, except for the Main Street <br />crossing. Because of the location of the Yellow Front Store, the new <br />box culvert would have to be constructed along the southwest side of <br />the building. <br /> <br />The proposed structures are all new; this plan avoids adding addi- <br />tional culverts to existing ones for two reasons. Because many of <br />the existing culverts are quite old, they would not last the 50-year <br />life of the project. This would requiy'e two construction projects - <br />one to add a second culvert;and another, some years later, to replace <br />the existing one. In addition, the proposed structures are less <br />susceptible to debris blockage because of their larger openings. <br /> <br />This plan provides excellent flood protection with the added benefit <br />of being able to contain up to a 100 percent increase in local urban <br />runoff. Additionally, this alternative can be constructed incrementally, <br />as the city can afford. Its disad'lantaqes are sl ightly higher cost and <br />- 26 - <br />