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Gunnison - Paonia Reservoir Sedimentation Study Application
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Gunnison - Paonia Reservoir Sedimentation Study Application
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Last modified
10/25/2012 11:56:01 AM
Creation date
9/13/2007 10:24:19 AM
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WSRA Grant and Loan Information
Basin Roundtable
Gunnison
Applicant
North Fork Water Conserv. District and Fire Mountain Canal and Reservoir Co.
Description
Paonia Reservoir Sedimentation Management Study
Account Source
Basin
Board Meeting Date
9/19/2007
Contract/PO #
150414
WSRA - Doc Type
Grant Application
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<br />. <br /> <br />. <br /> <br />. <br /> <br />Phase Two work may include one or more of the following possible work tasks: <br /> <br />a. <br /> <br />Preparation of Numeric Sediment Transport Model and Evaluation - In order to evaluate <br />the potential success of mitigation options which involve flushing or routing, it will be <br />necessary to develop a computerized sediment transport/deposition model of the reservoir <br />basin. This model will be developed using one of the existing modeling programs for <br />unsteady, non-uniform sediment transport such as MIKE 11 or MIKE 21C (developed by <br />the Danish Hydraulic Institute). This work will include a conceptual investigation to <br />determine the most appropriate software; calibration of the model using currently <br />existing stream concentration and flow data, data collected as part of this investigation as <br />well as existing reservoir sedimentation data; and running the model under various <br />anticipated or proposed conditions. In addition to modeling the effect of various <br />flushing/routing scenarios, analyses will be made of variations in reservoir operational <br />protocols on future sediment accumulation rates. <br /> <br />b. Dredging Disposal Sites - It will be necessary to enter into discussions with the owners <br />of potential disposal sites in order to assure that a suitable site can be obtained and to <br />assess the likely cost involved with developing such a site. Preliminary designs will be <br />provided for identified sites. It will also be necessary to determine the right of way <br />requirements needed to provide a discharge pipeline route from the dam to the disposal <br />site. <br /> <br />c. <br /> <br />Drainage Basin Yield Reduction - Further investigations will be conducted related to any <br />methods which are identified in the Phase One evaluation as having a potential for <br />economical success. The related Phase Two work will include obtaining field soil <br />samples and performing investigations into the costs involved and the likelihood of <br />success for these options. For example, if it is found that active slides comprise a <br />significant source of sediment, shallow soil samples will be obtained and tested, the slide <br />characteristics will be further investigated and preliminary stability evaluations will be <br />performed to identify possible stabilization alternatives. It is not intended that this work <br />will include detailed geotechnical investigations or analyses. <br /> <br />d. Preliminary designs may be performed for installation of a low-level outlet gate. This <br />work will include collaboration with the U.S. Bureau of Reclamation which retains safety <br />and technical oversight of the facility. <br /> <br />2. Monitoring and Sampling - It is anticipated that sediment monitoring stations will be <br />established at two locations. These locations will be immediately upstream from the reservoir <br />(probably located near the existing flow gauging station) and immediately downstream from the <br />reservoir. These stations will provide a means to start gathering baseline data for such tasks as <br />correlating the stations with total trapped sediment, correlating with runoff rates, identifying <br />seasonal variations in sedimentation and establishing patterns of sediment inflow and outflow <br />which will be needed to implement a flushing or routing protocol. This task will include the <br />following: <br /> <br />a. Each station will include means to monitor water turbidity, temperature and <br />conductivity. The turbidity probe will be tethered at the most appropriate location and <br />depth in the stream in such a way that it will rise and fall with the stream stage. <br />b. Each station will also include the ability to monitor stream stage. <br /> <br />4 <br />
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