03-13-2014
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<br />HMG_TO9‐A10_Long.docx 11 <br />b. Revise the Wild Rice River Control Structure and embankment alignment (combine <br />bridges). <br />c. Analyze the removal of the connecting channel between the Wild Rice River and <br />Red River. Replace with storage areas. <br />d. Analyze Hwy 81/Hwy 75/Red River Control Structure Bridge/Culvert Sensitivity at <br />the tie back levee. <br />e. Change the channel size from the Wild Rice River to the Diversion Inlet based on <br />cross section volume of the southern embankment. <br />f. Account for staging area levees including the proposed Oxbow/Hickson/Bakke and <br />Comstock levees. <br />g. Verify the eastern staging area tieback is modeled as being used in storage. Add <br />detail to check if culverts are adequate to convey water west to the Red River <br />Control Structure. <br />h. Revise Maple River south bank near the Maple River Aqueduct. Set elevation to <br />901.0. <br />i. Investigate diversion gate operations for events larger than the 0.2% chance event. <br />j. Update the Drain 14 inlet at the diversion. <br />k. Extend the Red River model from Grand Forks, ND to Drayton, ND. <br />II. Task 2 – Update tributary peak flow models with geometry developed in Task 1. <br />Complete modeling for the 10‐, 2‐, 1‐, 0.2‐percent chance flood events for both existing <br />conditions and with‐project conditions. <br />III. Task 3 ‐ Conduct a higher volume sensitivity analysis using the Red River peak flow <br />geometry from Task 1 and the high volume hydrology developed as part of the Phase 5 <br />unsteady modeling effort. Complete evaluations for the 1‐ and 0.2‐percent chance <br />flood events for both existing conditions and with‐project conditions. The main <br />objective of this task is to determine how the diversion system would operate with <br />higher volumes and if the higher volumes would affect the staging area elevation. No <br />mapping is required; however, calculate impacts and compare to Phase 7.0. For <br />comparison purposes, match Phase 7.1 downstream impacts, flows through town, and <br />diversion flows to the targeted values from Phase 7.0. The variable parameter will be <br />the staging area elevation. Prepare a technical memorandum to summarize the <br />sensitivity analysis. <br />IV. Task 4 – QA/QC of Phase 7.1 modeling. <br />V. Task 5 – Complete additional modeling and mapping tasks as part of the Phase 7.0 <br />modeling effort. These items include details such as: <br />a. Update geometry to include the City of Fargo Comprehensive Flood Protection Plan. <br />b. Additional mapping for existing and project conditions. <br />c. Development of Tributary Peak models. <br />d. Add detail to Interstate 94 near the Red River and also to Drain 27 area. <br />e. Update weir coefficients, culverts, initial elevations, and cross section duplication. <br />f. Diversion centerline alignment rectification due to Microstation and GIS formats. <br />g. Add Excavated Material Berms into project geometry. <br />h. Add designed bridges for Reaches 1 through 5 into the geometry. <br />DR <br />A <br />F <br />T
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