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Title: Mississippi River Ship Channel, Gulf to Baton Rouge, LA: Integrated General Reevalution Report & Supplement III to the Final Environmental Impact Statement, Mississippi River Ship Channel, Baton Rouge to the Gulf, Louisiana Project: Appendix G, Engineering Documentation Report EDR-OD-01
Authors: United States. Army. Corps of Engineers. Mississippi Valley Division.
Keywords: Mississippi River
Channels (Hydraulic engineering)
Inland navigation
Environmental management
Publisher: United States. Army. Corps of Engineers. New Orleans District.
Abstract: The U.S. Army Corps of Engineers, New Orleans District is converting the vertical datum for all coastal navigation projects from Mean Low Gulf (MLG) to Mean Lower Low Water (MLLW) in accordance with USACE (2014), memorandum directing conversion from USACE HQ. This memorandum describes new policy for federal navigation projects where the decision documents supporting project authorization and the project authorization in law do not reference the Mean Lower Low Water (MLLW) datum. According to the Memorandum “Navigation Projects Compliance with Vertical Datum Guidance” dated October 24, 2014:“ For federal navigation projects where the MLLW depth differs from the depths stated in the project authorization, an Engineering Documentation Report (EDR) shall be prepared in accordance with reference 1.d, paragraph 8.3 for each project and posted on a navigation home page for each district. The EDR will be of limited scope to document the datum change only.” The Mississippi River, Baton Rouge to the Gulf of Mexico project is currently authorized to (-)55 ft. MLG and maintained to (-)45 ft. MLG, respectively. Currently, the deep draft navigation channel is maintained as follows: New Orleans to the Gulf of Mexico (includes Southwest Pass) is maintained to (-)45 ft. MLG and New Orleans to Baton Rouge (includes Deep Draft Crossings) is maintained to (-)45 ft. LWRP. This report documents the calibration / relationship between the localized MLG as used in practice for this project and the NOAA-maintained MLLW that provides for no impact in current project channel maintenance practices. The report provides details on how this relationship was determined and will be applied. For ease of use this relationship will be used south of river mile 13.4 AHP and continuing down Southwest Pass (SWP), as this is the area covered by maintenance dredging. This area will be referred to as “Southwest Pass or SWP” in this EDR and the localized, in practice, use of MLG will be referred to as MLGSWP.
Description: Integrated General Reevaluation Report and Supplemental Environmental Impact Statement
Size: 23 pages / 884.3 Kb
Types of Materials: PDF/A
Appears in Collections:Environmental Documents

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