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<br /> <br />~- <br /> <br />Power Plant Intake Modifications <br />Modeling and Design <br /> <br /> <br />~ r-_ -:-\ I j~~j ~ <br />-'::.:. ~... r.c: ---. <br />- <br />~~~-:J~ ~~ -::-- ~-:j'J <br />_ e::.::.-" ~7~-=<:...-!L <br />-.- -- <br />........ <br />~ r- <br />-'~- <br /> <br />-' <br /> <br />~ <br />- <br /> <br />-- <br />--- <br /> <br />-- <br /> <br />- <br /> <br />-- <br /> <br />Project Tasks: <br /> <br /> <br />l~ <br />/ <br /> <br />- Design modifications to river training structures adjacent to a power plant <br />intake on the Minnesota River <br />- Use 2-dimensional hydrodynamic modeling to test the effectiveness of the <br />design <br />- Prepare construction drawings and specifications <br />- Assist with obtaining permits from the appropriate regulatory agencies. <br />- Assist with construction quality control <br /> <br />Project Description: <br /> <br />A cooling water intake for a power plant along the Minnesota River has <br />experienced the continued deposition of river sediments in front of the intake. <br />The problem relates to the natural migration of the river. In order to stop the <br />movement of the river away from the power plant, three rock spur dikes were <br />installed along the opposite bank. These spur dikes were designed to provide a <br />long-term benefit by re-directing the flow back toward the power plant thus <br />insuring the intake is kept clear of sediment. <br /> <br />Polaris Group designed an additional river training structure to create scouring <br />velocities in front of the intake. A 2-dimensional hydrodynamic model was <br />developed from the river bathymetry to test the effectiveness of the design. In <br />addition, the existing HEC-2 model was updated to determine the effect of the <br />modifications on the upstream flood stage. Polaris Group aided the client in <br />obtaining the required permits for the work. Construction drawings and <br />specifications were developed. To insure the structures were installed correctly, <br />Polaris Group assisted with the construction quality control. <br />