03-13-2014
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<br />HMG_TO9‐A10_Long.docx 13 <br />c. Upon completion of the update to the Wild Rice River basin HMS model by USACE,, <br />perform final model runs. Perform work that can be accomplished in advance to <br />prepare for the final HMS models runs. <br />d. Use the HMS results as input for an updated unsteady HEC‐RAS model run for each <br />storm centering. Complete the existing scope of work [can we cite a Paragraph <br />here?] for the PMF study using the updated unsteady HEC‐RAS model runs. <br />e. Prepare a report section documenting the GIS/HMS‐based runoff‐determination <br />effort and comparing the 1985 PMF study to this current study, including input <br />assumptions. Incorporate this draft report section into the overall current PMF <br />study report. <br /> <br />III. Deliverables <br />a. Updated runoff grids resulting from the GIS/HMS‐based runoff‐determination <br />effort. <br />b. Draft report . <br />c. Updated HMS models (16 models: 2 storms centering for 8 sub‐basins.) <br />d. Updated unsteady HEC‐RAS models (2 models, one for each storm centering). <br /> <br />K. PHASE 8 MODEL UPDATE <br />I. Background: <br />a. The Phase 8 modeling will incorporate higher volume hydrology developed by the <br />USACE. It will also include the development of the 20‐year event model and <br />investigate additional model updates in the staging area based on culvert <br />connections, connecting channel investigations, and tieback embankment <br />alignment adjustments. The downstream model limit will be Drayton, ND. <br />b. The most recent independent QA/QC review of the FM Diversion project unsteady <br />HEC‐RAS model occurred during the Phase 4 modeling (February 28, 2011). <br />Subsequent model updates included peer reviews by modelers, but did not <br />included a full independent review. <br />II. Scope: <br />a. Update geometry in the upstream staging area based on culvert details and the <br />local drainage plan (currently under development). <br />b. Update synthetic model hydrology for the 10, 50‐, 100‐, and 500‐year flood events <br />and develop new 20‐year hydrology using new higher volume hydrographs <br />developed by the USACE for the peak Red River flood event. Local inflow <br />development will utilize the Phase 1 HEC‐HMS models. <br />c. Update the existing conditions tributary peak unsteady model using updated <br />hydrology developed by the USACE for the 10‐, 50‐, 100‐, and 500‐year flood events <br />and new 20‐year hydrology. <br />d. Conduct QA/QC review of the Phase 8 Existing conditions models for the RRN and <br />tributary peak conditions. <br />e. Conduct with‐project modeling for the 10‐, 20‐, 50‐, 100‐, and 500‐year events for <br />the RRN peak flood event. <br />f. Conduct with‐project modeling for the 10‐, 20‐, 50‐, 100‐, and 500‐year events for <br />the tributary peak flood events. <br />g. Conduct QA/QC of the Phase 8 with‐project model runs. <br />DR <br />A <br />F <br />T
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