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<br />v - '3 <br /> <br />alternative, a series of small dams would be built between Eldorado <br />Springs and Highway 93. Each would be designed to retain peak <br />flows until flood danger had receded. The extent of control that <br />these reservoirs would have on the 100-year frequency floods would <br />depend on the location and drainage area that they controlled. <br />Realistically, it appears that suitable site s are not available for <br />these reservoirs to control much more than 5 percent of the total <br />drainage area in the basin. Therefore, their effect on peak flows <br />would be negligible and this alternative was not considered further. <br /> <br />Flood Plain Zoning. A portion of South Boulder Creek has already <br />be en zoned as flood plain lands which re stricts the utili zation of <br />the land to conforming uses such as open space, parks, suitable <br />gravel operations, properly flood proofed structures, etc. Strong <br />cons ide ration should be given to close coordination between the <br />City and the County to establish similar restrictions to the amended <br />flood plain limits along the Creek, as delineated in Volume II of this <br />Report, before development reduces the effectivenes s of any amend- <br />ment. <br /> <br />Acquisition of Flood Plain Lands. Serious consideration should be <br />given to the acquisition of the land along South Boulder Creek which <br />would be inundated during a 100-year return interval flood. This <br />approach, to insure that the land would remain free of development <br />that could be damaged during a flood, could be an addition to the <br />greenbelt program which is to provide a buffer zone of open spaces <br />around Boulder. <br /> <br />To evaluate the costs and benefits of acqulrtng land to restrict future <br />development, the following analysis was made using the notation <br />presented in the cost benefit section of this report: <br /> <br />(A/P, i%, t) = 0.066, (6%, for 40 years) <br />(P/F,j%, t) = O. 046, (8 %, for 40 years) <br /> Mo = $3,000 <br />Mt = $15,000 <br />Ia = $10/acre <br />Therefore <br />CL = $142 - Ip <br /> <br />