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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
Metadata
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Template:
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 />to loosen sediment material, pump it into a discharge line and transport the dredged <br />slurry to a sedimentation basin where it can be settled and decanted. The disposal site <br />must be sufficiently flat and large enough to allow for local permanent disposal of the <br />dewatered sediment. <br />e. Hydro-Suction - This option is similar in concept to mechanical dredging except <br />that the removal of the sediment from the reservoir basin is done with out a pump. The <br />sediment is lifted from the bottom of the reservoir and transported downstream from the <br />dam based on the difference in elevation between the reservoir level and the downstream <br />disposal site. Both mechanical dredging and hydro-suction require a disposal site and, <br />therefore, the Phase One work will include identification of potential sites. <br />f. Reduction of Basin Sediment Yield - Although experience has shown that <br />catchment management is not generally an economically feasible approach to reservoir <br />sedimentation management, information from long-time local residents suggests that a <br />large source, if not the primary source, of sediment consists of a landslide, or series of <br />landslides, located within a very limited stretch of one of the tributaries to Paonia <br />Reservoir. This part of the study will include a detailed field examination of the <br />drainage basin, selected sampling and testing of grab samples from any suspect source <br />areas, review of aerial photography, research existing sediment yield information <br />(including regional data), identification of both human and natural disturbances and <br />characterization of any channel degradation. <br /> <br />5. The evaluation of alternatives will include conceptual designs as appropriate and <br />associated cost estimates. <br /> <br />. 6. Investigate Regulatory Constraints - The cost and/or feasibility of some mitigation <br />options may be significantly impacted by the necessity to satisfy federal, state and local <br />legislative and regulatory agency rules and standards. Additionally, some of the methods <br />normally used for sediment control may not be commonly used in the State of Colorado and <br />rules and regulations may need to be clarified, expanded or revised to address these methods. <br />Therefore, it will be important to adequately identify and define the limitations that will <br />constrain these methods. <br /> <br />7. The Phase One study findings will be presented in a report. The report will identify the <br />technical feasibility of the alternative sediment management techniques and will select the most <br />economical sediment management options. Additionally, the report will provide the engineers' <br />opinions regarding the likely degree of success that can be anticipated using the techniques <br />evaluated. The report will be followed by discussions between the project sponsors and the <br />engineers. The objective of the discussions will be to agree on two or three selected sediment <br />management techniques that should be investigated in more detail in Phase Two. <br /> <br />. <br /> <br />Phase Two work will consist of refining the selected option( s) by obtaining more comprehensive <br />supporting data, performing more detailed engineering analyses, refining cost estimates and <br />pursuing needed permits. The actual scope of the Phase Two work will be somewhat dependent <br />on the results of the Phase One analyses. The current application for funding is based on the <br />anticipated scope of work described below. The cost estimate includes a not-to-exceed amount <br />for investigation of the selected option(s). A contingency factor has been applied to the <br />estimated study cost to account for any needed modifications to the Phase Two scope of work: <br /> <br />1. Detailed Evaluation of the Selected Option( s) - Depending on the selected option( s) the <br />3 <br />
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