03-13-2014
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<br />HMG_TO9‐A10_Long.docx 14 <br />h. Prepare floodplain mapping for the 10‐, 20‐, 50‐, 100‐, and 500‐year events for <br />existing conditions and with‐project for both the RRN and tributary peak flood <br />events. <br />i. Prepare draft and final Technical Memorandums summarizing Phase 8 modeling <br />results. <br />j. Conduct an independent QA/QC review of the unsteady HEC‐RAS model. <br />i. Part 1 – Conduct an independent QA/QC review of the Phase 7.1 unsteady <br />HEC‐RAS model geometry and general assumptions. Include a kick‐off <br />review meeting, a review of the technical memorandums and previous <br />District Quality Control (DQC) and Agency Technical Review (ATR) reviews <br />developed for the model updates subsequent to Phase 4, and a review of <br />geometry files through Phase 7.1 of the model. Commence review <br />following completion of the Phase 7.1 update. <br />ii. Upon completion of the Phase 7.1 model review, provide <br />recommendations for additional QC review of the Phase 8 model updates. <br />iii. Document the review findings and recommendations in Technical <br />Memorandum. <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 />DR <br />A <br />F <br />T
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