03-13-2014
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<br />HMG_TO9‐A10_Long.docx 6 <br />4. Develop a brief, graphics‐rich, PowerPoint presentation of the background and <br />results. This presentation must be suitable for a non‐technical audience. <br />5. Determine timing of tributary contributions to the low flow channel by <br />reviewing and comparing the Phase 1 HEC‐HMS model results for the Rush and <br />Lower Rush Rivers, and Drains 14 and 21C for the 2‐year and 5‐year 24‐hour <br />rainfall events. Compare model results to low flow channel hydrology <br />developed by USACE. <br />6. Prepare a Technical Memorandum presenting summarizing results. <br />II. EXTREME EVENT EVALUATIONS <br />1. Evaluate the following for extreme (103,000 cfs and Probable Maximum Flood <br />(PMF)) events <br />a. Adequacy of aqueduct openings <br />b. Lowering the left EMB to reduce the amount of flow in the Diversion <br />Channel <br />c. Head differential across raised road in the staging area <br />d. For VE‐13 Option D, sloping the Diversion Channel from the Wild Rice <br />River toward the Diversion Inlet <br />III. TRIBUTARY PEAK MODEL RUNS TO SUPPORT THE MAPLE RIVER AQUEDUCT PHYSICAL <br />MODEL <br />Background: To provide 10‐, 50‐, 100‐, and 500‐year tributary peak hydrographs in the <br />current version of the unsteady RAS model to obtain the best available tributary peak <br />flow information for the Maple River physical modeling effort. These updated tributary <br />peak model runs will aid in the effort of determining the flow combinations to be <br />modeled during maple River physical modeling effort. <br />Scope: Perform model runs for the 10‐, 50‐, 100‐, and 500‐year tributary peak <br />hydrographs to support the USACE’s physical and numeric modeling of the Maple River <br />Aqueduct Structure. Provide modeling results to USACE. <br />IV. ADDITIONAL ASSISTANCE FOR THE MAPLE RIVER AQUEDUCT PHYSICAL MODEL <br />Scope: Additional assistance includes participating in bi‐weekly conference calls, <br />providing additional technical information and support from Feasibility Study team to <br />USACE’s physical modeling team, and attending a four‐day value‐based design <br />charrette. <br />V. UNSTEADY HEC‐RAS MODELING OF EXISTING PMF INFLOWS <br />Background: The existing Probably Maximum Flood (PMF) was developed almost <br />30 years ago (1984) and is based on simple hydrologic routing that likely does not <br />account for the full effects of floodplain storage and cross‐basin flow that occurs <br />upstream of Fargo‐Moorhead. USACE has updated the unsteady HEC‐RAS model <br />upstream of the unsteady HEC‐RAS model currently being used for the FMMFRM project <br />so that it has the extents and connections necessary to model the PMF event. The <br />portion of the FMMFRM unsteady HEC‐RAS model from Abercrombie, ND (the upstream <br />extents of the unsteady HEC‐RAS model being used for the FMMFRM study) through <br />Fargo‐Moorhead has been added to the upstream model to create the unsteady HEC‐ <br />RAS model required for this PMF analysis. To avoid confusion, the unsteady HEC‐RAS <br />model being used for the PMF analysis will be referred to as the “Upstream” model, <br />DR <br />A <br />F <br />T
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