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<br /> <br />b) Unsteady HEC-RAS Modeling of New PMF Inflows <br />Using the updated unsteady HEC-RAS model with the updated inflow locations, <br />model two sets of hydrographs representing two different runoff scenarios. USACE <br />will provide the two sets of inflow hydrographs. Evaluate the inflow locations and <br />the magnitude and shape of the hydrographs for reasonableness and model <br />stability. Modify as required, in consultation with USACE, to allow the model to run <br />successfully. <br />Once any model instabilities have been addressed and the model runs are <br />complete, evaluate, in consultation with USACE, the hydrographs at the Fargo gage <br />location to determine whether additional sets of hydrographs representing other <br />runoff scenarios are required to determine the PMF at the Fargo gage location (to <br />be performed under subtask c). <br /> <br />Deliverables: <br />i. Preliminary unsteady HEC-RAS models. <br />ii. Draft Technical Memorandum. Prepare a Technical Memorandum that <br />summarizes the work effort and the resulting hydrograph at the Fargo <br />gage location. <br /> <br />c) Additional Unsteady HEC-RAS Modeling of New PMF Inflows (if authorized). <br />If additional sets of hydrographs need to be developed to determine the PMF at the <br />Fargo gage location, as determined in subtask b, USACE will provide one to four <br />additional sets of hydrographs to be modeled with HEC-RAS. Prepare update of <br />draft Technical Memorandum prepared in subtask b. <br /> <br />Deliverables: <br />i. Preliminary unsteady HEC-RAS. <br />ii. Second draft Technical Memorandum. <br /> <br />d) Final Technical Memorandum. <br />Upon review of the model results and draft Technical Memorandum by USACE, <br />finalize the HEC-RAS models and prepare a Final Technical Memorandum, <br />addressing comments provided by USACE. <br /> <br />Deliverables: <br />i. Final unsteady HEC-RAS input and output files for the PMF event. <br />ii. Final Technical Memorandum. <br /> <br />VI. UPDATE HEC-RAS MODEL <br />a) Update the HEC-RAS model geometry for the revised western alignment from the <br />Maple River to the Sheyenne River and the proposed upstream staging area ring <br />levees. <br />b) Provide on-going hydrology and hydraulic modeling services as requested in order <br />to keep HEC-RAS model consistent with project features. <br /> <br />VII. CONNECTING CHANNEL AND 20-YEAR EXISTING CONDITIONS <br />Scope: <br />a) Connecting Channel Geometry: Update the HEC-RAS model geometry to <br />incorporate the geometry of the connecting channel between the Wild Rice and <br />Red Rivers. Complete the 10-yr, 20-yr, and 50-yr model runs to determine the <br />HMG_TO9-A13_Long.docx 8 <br />DR <br />A <br />F <br />T <br /> <br />3/6 <br />/ <br />2 <br />0 <br />1 <br />5 <br />