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that using single point estimates as inputs to the model, distributions can be used that <br /> more accurately reflect reality. For instance,likelihoods of cost overruns,probabilities of <br /> a given life expectancy being achieved,and projections of use of the land in the future <br /> will be determined. The resulting benefit-cost ratio will be more realistic and can be <br /> viewed as a distribution with probabilities associated with it-rather than a fixed number. <br /> Additionally, information will be obtained from the South Columbia Basin Irrigation <br /> District on their 15 year-old maintenance program. <br /> Task 8 <br /> Conceptualize annual O&M costs of a fully rehabilitated drainage network using three scenarios: <br /> 1. Individual drainage district operations <br /> 2.Through a consolidated drainage district authority <br /> 3. Conducting all drainage O&M through private contactors <br /> DELIVERABLES <br /> A final report of the drainage system study would include the following: <br /> 1. A brief historical review of the drainage systems in the Lower Arkansas Valley and how they <br /> arrived at their current condition,including information on the annual assessments and <br /> expenditures for the 25 drainage districts over the past ten years. This will guide policy for <br /> the rehabilitation of the lower valley's drainage system,including an assessment and <br /> acceptance of the need for a future Lower Arkansas Valley Drainage Authority. <br /> 2. A complete inventory and assessment of the existing drainage system(i.e.,the approximately <br /> 84 miles of subsurface drains and 107 miles of surface wasteways). This will include <br /> GPS/GIS mapping of the drainage system,with descriptive information and naming of all <br /> known features of the drainage system. <br /> 3. The cleaning of one section of the drainage system(i.e.,the beta system)to obtain cost <br /> figures on potential rehabilitation. <br /> 4. Economic cost/benefit analysis of three rehabilitation scenarios;cleaning and modest <br /> improvements,major rehabilitation of the existing system,and design and construction of a <br /> new and redesigned drainage system. <br /> BUDGET <br /> The total CWCB grant budget for the project includes the following: $169,089 <br /> 1. Salaries and fringe benefits for CSU research staff-$64,926. <br /> a. John Wilkins-Wells—coordinate all research activities,plan and conduct study tours,and <br /> write all reports -5 months <br /> 17 <br />