ArkNavReport_TOC_Acronyms_ExecSummary.doc

Deepening the channel would make shipping on the

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Deepening the channel would make shipping on the system more compatible with the other deeper draft navigation systems such as the Lower Mississippi River and allow tow boats and barges to better employ their full capacity to carry and move cargo. The lower Mississippi has a 12-foot channel depth available approximately 85% of the time. Preliminary Screening of Features and Components: The formulation of alternatives began by identifying features and components within each feature that meet the planning objective of providing a safe, reliable, efficient, and sustainable navigation channel. Alternative formulation was started by identifying potential measures to achieve the study purpose and subjecting them to a screening process that resulted in the selection of the viable components that make up the alternatives. Both components and alternatives underwent detailed analysis. The alternative development and analysis for this study included: Features. Features are broad actions that influence the attainment of the study purpose; Components. Components are one or more specific actions within a feature that address the attainment of the study purpose within a feature; and Alternatives. Alternatives are combinations of components, among one or more features, that specifically address the attainment of the study purpose. Navigation Channel Maintenance Feature: The proposed Maintenance Dredging and Disposal Action is to maintain the existing 9-foot navigation channel via the existing river training structure system and maintenance dredging. As part of the ongoing operation and maintenance of the designated 9-foot navigation channel on the MKARNS, periodic dredging is required in some locations. Since the opening of the MKARNS in 1971, some approved dredged material disposal sites have reached capacity and new disposal sites are required to accommodate continued navigation channel maintenance activities. Other sites have sufficient capacity for continued maintenance dredging and disposal operations. xii
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River training structures are also an important tool in maintaining navigation channel depth. The existing river training structure system on the MKARNS functions to reduce the need for maintenance dredging, however, new structures are periodically needed to facilitate the maintenance of the 9-foot navigation channel. The screening process included the evaluation of a range of possibilities to determine the viable components to be considered for implementation. Based upon the review process, two components were selected for detailed analysis. Component 1: Maintenance Dredging and Disposal – Maintenance Dredged Material Disposal in Areas Approved in the 1974 O&M Plan (No Action Plan), and Component 2: Maintenance Dredging and Disposal – Maintenance Dredged Material Disposal in New Disposal Sites.
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