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C153804 Feasibility Study
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C153804 Feasibility Study
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Last modified
7/22/2011 3:26:42 PM
Creation date
10/5/2006 11:51:55 PM
Metadata
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Template:
Loan Projects
Contract/PO #
C153804
Contractor Name
Left Hand Ditch Company
Contract Type
Loan
Water District
5
County
Boulder
Bill Number
HB 95-1155
Loan Projects - Doc Type
Feasibility Study
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<br />Chapter I - Introduction <br /> <br />The State of Colorado, acting through the State Engineers Office (SEO), has determined that <br />the spillway capacity at Left Hand Valley Iteservoir, located north of Boulder, Colorado, is <br />inadequate and will not safely pass the runofffmm the 75 percent Probable Maximum Precipitation <br />storm without overtopping of the dams. On October 3, 1991 the SEO ordered the Left Hand Ditch <br />Company to increase the spillway capacity or be subject to a storage restriction. A copy of the order <br />is included as Appendix A. The purpose of this feasibility study is to determine the most feasible <br />method of increasing the spillway capacity at Left Hand Valley Reservoir. <br /> <br />A non-structural plan and seven structural plans are examined for financial, technical and <br /> <br /> <br />institutional feasibility. The non-structural plan is one of no action. The structural plans include <br /> <br /> <br />widening the existing spillway, constructing a new spillway over the north dam, and providing <br /> <br /> <br />complete overtopping protection for the north dam. For the new spillway alternatives both <br /> <br /> <br />conventional formed concrete and roller cOmpacted concrete are considered. Roller compacted <br /> <br /> <br />concrete is considered exclusively for the overtopping alternatives. In order to minimize the size <br /> <br /> <br />of the spillway, and therefore the cost of the project, various means of raising the dams are <br /> <br /> <br />discussed. Fuse plug embankment construction is considered in order to cause the existing spillway <br /> <br /> <br />to be utilized for more frequent floods. <br /> <br />The project will be financed through a loan from the Colorado Water Conservation Board <br />and a bank loan. Repayment will be accomplished by charging increased assessments against issued <br />share of Company stock. A financial analysis is presented showing the funding and repayment for <br />the preferred alternative. <br /> <br />1 <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 />
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