04-09-2015
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<br />XI. LFC MODELING: MAPLE RIVER TO THE DIVERSION INLET <br />1. Purpose: For the Diversion Channel between the Maple River and the Diversion <br />Inlet Structure, determine the appropriate meandering LFC wavelength and <br />amplitude design parameters Diversion Channel bottom widths of 200-feet and <br />250-feet. <br />2. Background: Additional H&H modeling of flow in the Diversion Channel from <br />the Maple River to the Diversion Inlet has shown that the current 300-feet wide <br />Diversion Channel can be narrow to 200-feet and still pass the project design <br />flows. A narrower Diversion Channel will require revised meandering LFC <br />design parameters. <br />3. Scope: <br />a. Task 1 - Provide analysis of the morphodynamic stability of the <br />meandering LFC alignment within the main Diversion Channel from <br />the Maple structure upstream to the Diversion Inlet structure. <br />Determine an appropriate alignment wavelength that will not tend to <br />initiate planform widening. Determine an alignment amplitude such <br />that the LFC planform is within the main Diversion Channel for 200- <br />feet and 250-feet bottom widths and 25-feet and 50-feet side slope <br />toe buffer zones. Model the recommended alignments in RVR <br />Meander model and summarize the alignments’ stability. <br />b. Task 2 – If authorized in writing, model the designed alignments from <br />the Maple River downstream to Reach 1 (to be provided by USACE) in <br />RVR Meander and summarize the alignments’ stability. <br />4. Deliverables: <br />a. Draft and Final Technical Memorandums summarizing the results of <br />the analysis and modeling. <br />b. Power Point presentation summarizing the results. <br /> <br />3. Owner’s Responsibilities <br />Owner shall have those responsibilities set forth in Article 2 and in Exhibit B. <br />4. Times for Rendering Services <br />Subtask Start Time Completion Time <br />A. Meander Belt Width Analyses April 12, 2012 October 31, 2012 <br />B. Identification and Assessment of Tie Back Levees June 1, 2012 October 31, 2012 <br />C. EMB Openings June 1, 2012 October 15, 2012 <br />D. Diversion Inlet Gates June 1, 2012 October 31, 2012 <br />E. On-Call Services TBD with each task September 30, 2015 <br /> E.I-Maximum Project Design Flows July 16, 2012 October 31, 2012 <br /> E.II-Local Drainage Plan September 13, 2012 October 31, 2012 <br /> E.III-Reach 1 Low Flow Channel Meander Modeling November 8, 2012 December 31, 2012 <br />HMG_TO08-A10_Long.docx 11 <br />DR <br />A <br />F <br />T
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