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Mr. Ron Bottoms <br />July 22, 2009 <br />Page 10 of 12 <br />performed on the reach between detention basin B512-01-00 and Armand Bayou (B100- <br />00-00). <br />Table I <br />Cnmmav%T ni Watpr swnd Flaw rhanuec <br />Channel <br />Average Changes in WS & Q <br />Reach <br />Option 1 <br />Option 2 <br />Phase 1 <br />Phase 2 <br />WS <br />Change <br />Q <br />Change <br />WS <br />Change <br />Q <br />Change <br />WS <br />Change <br />Q <br />Change <br />(ft) <br />(cfs) <br />(ft <br />cfs <br />(ft) <br />(cfs) <br />B112-00-00 <br />-0.23 <br />-140.58 <br />-0.19 <br />-94.37 <br />-0.44 <br />-269 <br />B 112-02-00 <br />-0.89 <br />0.00 <br />-0.32 <br />-242.20 <br />-1.09 <br />-182 <br />B 109-00-00 <br />0.03 <br />162.62 <br />0.00 <br />0.00 <br />-0.13 <br />65 <br />Construction Estimates <br />Estimates were generated for each of the options and are included in the attachments. <br />Option IA is Option 1 estimated with a bridge structure at Canada Street and also <br />includes extensive channel improvements along B 112-02-00 to reverse the grade to flow <br />west to east. This is the most expensive of the options. <br />Option 1 B is Option 1 estimated with reinforced concrete boxes at Canada Street and <br />does not include any channel work except at the dammed off portion at B112-00-00 and <br />the tie-in to B109-03-00. This is the least expensive option. <br />Option 2 turned out to be between Option 1 A and B in construction costs. Option 2 <br />includes detention located along B 112-00-00 and B 112-02-00, thereby; reducing the <br />amount of potential detention required in future B509-03-00. <br />