03-12-2015
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<br />III. Deliverables: <br />a. Updated phase 8 model for the Red River peak flood events, including the 10-, 20-, <br />50-, 100-, and 500-year events for both existing conditions and with-project <br />conditions. <br />b. Updated phase 8 models for the tributary peak flood events, including the 10-, 20-, <br />50-, 100-, and 500-year events for both existing conditions and with-project <br />conditions. <br />c. Floodplain maps for the 10-, 20-, 50-, 100-, and 500-year events for existing <br />conditions and with-project for both the RRN and tributary peak flood events. <br />d. Draft and Final Phase 8 Technical Memorandum. <br />e. Draft and Final QA/QC Technical Memorandum, Kick-off meeting minutes, and <br />Quality Review Form (QRF) summarizing review comments for the Phase 7.1 QC <br />review. <br />L. UPDATE THE BALANCED HYDROGRAPHS AT HICKSON, ND <br />I. Background: <br />a. The USACE, St. Paul District, requested assistance to update the Red River of the <br />North (RRN) balanced hydrographs at the USGS gage at Hickson, ND. This effort is <br />required prior to starting the Phase 8 model update, and involves working with <br />both the hydrologic (HEC-ResSIM) and hydraulic (unsteady HEC-RAS) routing models <br />to determine the proper ungaged inflow hydrographs and hydrologic modeling <br />parameters such that similar results are obtained from the two methods. <br />II. Scope: <br />a. Hydrologic Model Development: Use the unsteady HEC-RAS model to determine <br />peak flows at Hickson and Abercrombie ND and identify breakout flow locations. <br />b. Initial Storage Outflow Curve Development: Develop storage outflow curves for the <br />hydrologic model reaches determined in above task, and identify bankfull <br />discharges for each routing reach. <br />c. Quality Control Check on Unregulated Record Generated by Hydrologic Model: Run <br />five test historic, unregulated events through the unsteady HEC-RAS model to check <br />the validity of the unregulated record being developed by the hydrologic modeler. <br />d. Routed Synthetic-Event Unregulated Hydrographs and Report: Using information <br />developed in previous tasks, provide the resulting unregulated hydrographs at <br />Fargo, ND and Wahpeton, ND, which are produced in concert with the 10-yr, 50-yr, <br />100-yr, 200-yr, 500-yr synthetic events at Hickson, ND. <br />e. Fine Tune the Regulated Synthetic Event Analysis: Run the five HEC-RAS models <br />(10-yr, 50-yr, 100-yr, 200-yr, 500-yr synthetic events) for regulated conditions using <br />the outflow hydrographs from the reservoirs developed by USACE using the <br />hydrologic model. <br />f. Final Technical Memorandum: Develop an overall Technical Memorandum <br />summarizing the work accomplished for Tasks 1-5. <br />III. Deliverables: <br />a. Breakout Flow and Hydrologic Routing Reach Report <br />b. Upstream Input Test Hydrographs and Routed Test Hydrographs at Critical <br />Locations <br />HMG_TO9-A13_Long.docx 16 <br />DR <br />A <br />F <br />T <br /> <br />3/6 <br />/ <br />2 <br />0 <br />1 <br />5 <br />
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