Laserfiche WebLink
<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 />water yield between alternatives. All alternatives, except Options 4-1 and 4-6, have <br />been" structured to fully resurface the dam. However, only Option 4 (4-6) has been <br />structured to address a limited funding budget, limiting the construction to less than full <br />resurfacing. Comparative economics between full resurfacing options can be made <br />between Option 4-4 (full resurfacing with soil cement) and the other full resurfacing <br />options. <br /> <br />Feasibility level construction costs were prepared for all alternatives. Quantities <br />were determined using the aforementioned survey data to provide the existing dam <br />,configuration, representing the baseline for modifications. Design concepts are <br />presented above. Unit prices for work items were determined from past projects the <br />authors have had involvement in, from quotes for specific materials and products <br />obtained from contractors and suppliers, and from estimates obtained from contractors <br />familiar with the type of work being proposed. <br /> <br />In order to make total present costs comparable, it is necessary to compare <br />alternatives for the same total life, including project replacement, if necessary. Based <br />on the economic useful life of dams and reservoirs contained in the Handbook of Dam <br />Engineering by Alfred R, Golze, 1977, and on the overall structural condition and rate of <br />sedimentation of the reservoir, we consider the d,am and reservoir to have an economic <br />useful life of at least an additional 50 years. For these alternatives, the projects have <br />been compared based on a 50-year life, assuming major maintenance or project <br />replacement as required to obtain the projected 50-year life span. <br /> <br />Table 8 provides a summary of the year 2000 project costs, including major cost <br />components. Table 9 provides the present worth of the costs, reflecting initial cost plus <br />the present worth of future construction, future maintenance, and/or additional project <br />resurfacing. Detailed cost estimate evaluations are included in Appendix F and present <br />worth calculations are included in Appendix G. <br /> <br />33 <br />