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Method: Select beta drainage system. Install new observation wells as needed along the beta <br /> drainage system, and utilize existing Colorado State University observation wells where <br /> possible. <br /> Method: Establish initial baseline data on well depths prior to cleaning,and then monitor <br /> water table depths as the beta system is cleaned,and for an additional irrigation season after <br /> cleaning. Develop or update water contour maps as data is recorded. <br /> Method: Excavate wasteway for the beta drainage system as needed. Install water flow <br /> monitoring system at the outlet(s)of the beta system into the wasteway. <br /> Method: Clean out the selected beta subsurface drainage system. This system will be used to <br /> estimate rehabilitation benefit-costs. Begin cleaning beta drainage system from the wasteway <br /> outlet with jet cleaner equipment. <br /> Method: Install 18"PVC section and 15"PVC riser(observation manhole)at every 600 feet, <br /> or where the jet cleaner meets an impassable obstruction. Continue until the entire beta <br /> system is cleaned. <br /> Task 5 <br /> Develop a composite tri-county(i.e.,Prowers,Bent and Otero counties)rehabilitation and <br /> maintenance spreadsheet,based on methods derived from the South Columbia Basin Irrigation <br /> District drainage maintenance program. This operation and maintenance spreadsheet would <br /> incorporate future annual maintenance for all subsurface drainage infrastrucutere in the tri-county <br /> area,and will also be useful in providing guidelines for future rehabilitation steps. This activity <br /> would be conducted in three stages,and key off both the drainage system mapping activity and the <br /> cleaning of the beta system: <br /> Method: A preliminary analysis of corrective action to upgrade the existing drainage system, <br /> and the estimated benefited acreage. <br /> Method: A preliminary analysis of potential new subsurface and surface drainage systems <br /> that would benefit additional lands that do not appear to be served by the existing drainage <br /> systems, and the additional estimated benefited acreage. Information on potentially new <br /> benefited acreage would be obtained from the current on-going Colorado State University <br /> research. <br /> Method: A preliminary estimate of the maximum economic benefit to be achieved by <br /> designing adequate drainage for the best classes of land in the tri-county area,based on their <br /> current production value. <br /> Task 6 <br /> Begin exploring with landowners the possible opportunities to combine all or most drainage <br /> systems under a new consolidated drainage authority for the Lower Arkansas Valley. <br /> Method: Evaluate and compare drainage district assessment collections and annual O&M <br /> costs for the current unconsolidated drainage district situation(i.e.,25 or so independent <br /> drainage districts)and then for a new consolidated authority,utilizing an O&M program <br /> 15 <br />