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<br />COMMENTARY SHEET 2 <br /> <br />ESTIMATED CONSTRUCTION COST <br /> <br />The proposed City of Lakewood park would provide the nucleus for this stretch. <br />Total retention of the 100-year storm would be achieved with the 26 acre- <br />feet flood storage pond at Garrison Street. An impervious embankment which <br />is 9 feet higher in elevation than Garrison Street would serve to pond the <br /> <br />Item <br /> <br />Retent i on Pond <br /> <br />water as well as to visualy screen vehicular traffic along the street from <br />pa rk users. Slopes for the pond itself would range from 5 to 1 to 10 to 1 <br />and would blend with the ex is t i ng topography. Any excess cut material <br />cou I d be used in the surrounding park area for land forms and berming. <br /> <br />Pond Outlet Pipe <br /> <br />TOTAL CONSTRUCTION COST <br /> <br />Cost <br /> <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 />$101,000 <br /> <br />$ 6,000 <br />$107,000 <br /> <br />Engineering and Contingencies (25% Construction Costs) $ 27,000 <br /> <br />The pond would discharge to the existing storm sewer system at the northeast <br /> <br /> <br />corner of the property, thus eliminating costly improvements to cross Garri- <br /> <br /> <br />son. A controlled 5 cfs discharge rate would be maintained during flooding <br /> <br /> <br />events. The pond would remain dry for recreational uses at other times. <br /> <br /> <br />An emergency spillway is located at the southeast corner of the berm to <br /> <br /> <br />allow flows greater than the design event to be directed north along <br /> <br /> <br />Garrison in the historic floodplain. <br /> <br />Fiscal, Legal and Administrative (8% of Total Above) <br /> <br />Land Acquisition Cost <br /> <br />TOTAL COST <br /> <br />Annual Maintenance Cost <br /> <br />A two-foot berm paralleling the northern property line would prevent flood <br />waters from entering the adjacent residential development. <br /> <br />South Lakewood Gulch could be slightly regraded to meet park grading plans <br />in the remainder of this reach. However, the final channel would be flood- <br />plain delineated through this area. Transbasin diversion of storm flows <br />would not be allowed. <br /> <br />* Land owned by City of Lakewood Parks Department. <br /> <br />The 100-year floodplain is to be regulated and it is recommended that the <br />residents within and adjacent to the 100-year floodplain be notified <br />annually of the potential flood hazards. <br /> <br />$ 11,000 <br /> <br />-0-* <br /> <br />$145,000 <br /> <br />$ <br /> <br />300 <br />