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Mr. Ron Bottoms <br />July 22, 2009 <br />Page 9 of 12 <br />Option 2 can be phased in over time by breaking out detention locations D1 and D2 on <br />B 112-00-00 and D3 on B 112-02-00, see Exhibit 6 for detail. Option 2 Phase 1, is an <br />interim condition by constructing 49.0 ac-ft of detention in both B112-00-00 and B112- <br />02-00 first. The remaining design elements can be constructed in the future. Option 2, <br />Phase 1 includes: <br />1) Propose 49.0 ac-ft for detention along B 112-00-00, B 112-02-00 and B 109-03-00 <br />to reduce the amount of detention required in HCFCD basin B509-03-00 and <br />minimize needed channel improvements in B 109-00-00 to convey flow. <br />a. Location D1 --14.8 ac-ft of storage is available for detention along B112- <br />02-00 from 1.9 acre buyout location along Gladwyne Court. This requires <br />purchase of two (2) single family houses, demolition of the structures and <br />excavation on Gladwyne Court. <br />b. Location D2 — 8.0 ac-ft of storage is available for detention along B 112- <br />00-00 from 1.14 acre City owned property on Bandridge Road. This <br />location is currently undeveloped. <br />c. Location D3 — 26.0 ac-ft of storage is available for detention along B 112- <br />00-00 from 2.5 acres the City owns between Somerton Drive and B112- <br />00-00. This is an undeveloped open area in the park area that is bound by <br />the public pool to the north, utility corridor to the south, B112-00-00 to the <br />West and Somerton Drive along the east. <br />Model Results <br />Option 1 resulted in a maximum water surface reduction in B 112-00-00 of -0.60 ft with <br />an average of -0.23 ft, and maximum flow reduction of -301 cfs. Maximum water <br />surface reduction in B109-00-00 is -0.36 ft and occurs in B109-03-00. Average water <br />surface reductions along B 112-02-00 are -0.89 ft between B 112-00-00 and Canada Street. <br />Option 2 provides an average water surface reduction in B 112-00-00 of -0.44 ft and <br />average flow reduction of -269 cfs. Average water surface reduction in B 109-00-00 is <br />estimated at -0.13 ft and average flow increases around 65 cfs. Average water surface <br />reductions in B 112-02-00 are -1.09 ft between B 112-00-00 and Canada Street with <br />associated reductions in flow of -182 efs. <br />Option 2 Phase 1 provides an average water surface reduction in B 112-00-00 of -0.19 ft, <br />and average flow reduction of 94 efs. Average water surface reductions in B112-02-00 <br />are -0.46 ft between B 112-00-00 and Canada Street with associated flow reductions of <br />242 cfs. The water surfaces and flows in B109-00-00 do not change because no work is <br />