03-13-2014
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<br />HMG_TO9‐A10_Long.docx 7 <br />while the unsteady HEC‐RAS model generally being used for most of the FMMFRM study <br />will be referred to as the “FMMFRM” model. <br />To get an idea of how much the PMF might change, the Corps and the Project Sponsor <br />previously decided that it would be useful to investigate routing the existing PMF <br />inflows using the Upstream model. The Corps has set up the Upstream model with the <br />proper inflows. <br />Scope: <br />a) Perform a technical review of the model <br />b) Address the instability issues related to running the model with very large inflows <br />c) Produce final model runs using the 1984 hydrology that provide the PMF at the <br />Fargo gage. <br />Deliverables: <br />a) Draft unsteady HEC‐RAS models. <br />b) Draft technical memorandum (hard copy and electronic). <br />c) Final unsteady HEC‐RAS input and output files for the PMF event. <br />d) Final technical memorandum. <br />Phase 2 ‐ Numerical Modeling Scope: <br />a) Set Up Unsteady HEC‐RAS Model for New PMF Inflows <br />USACE has developed a number of new inflow locations for the unsteady HEC‐RAS <br />model that are associated with HMS output hydrographs. These inflow locations <br />have been provided separately in an HEC‐RAS unsteady flow data file. Develop a <br />draft unsteady HEC‐RAS model with updated inflow locations. If requested, modify <br />names of certain reaches and storage areas to be consistent with the final unsteady <br />HEC‐RAS model used for the PMF flow routing. <br /> <br />Deliverables: <br />i. Draft unsteady HEC‐RAS model with updated inflow locations. <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 />DR <br />A <br />F <br />T
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