ArkNavReport_TOC_Acronyms_ExecSummary.doc

Xxv alternative c navigation channel maintenance and

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Alternative C - Navigation Channel Maintenance and Operations Only Flow Management: Annual incremental net benefits would be $8.8 million with Alternative C compared to Alternative B. Much of the positive incremental net economic benefits would be associated with navigation and hydropower. Incremental net annual navigation economic benefits would approximate $8.4 million, comprising 95% of the annual incremental net economic benefits under this alternative. The remaining incremental net annual positive economic benefits would be associated with hydropower ($0.5 million). Table E-6 summarizes the information. xxvi
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Alternative D - Navigation Channel Maintenance, Operations Only Flow Management, and 11 Foot Navigation Channel: For Alternative D, annual benefits equal $19.0 million. Annual net benefits equal $8.8 million with the implementation of this alternative as compared to Alternative B. The major economic benefit would come from navigation savings. These savings result from lowering the transportation cost associated with commodities such as grains, chemical fertilizers, gravel, etc. that are able to capitalize on efficiencies by loading barges to a deeper depth. The remaining economic benefits would come from hydropower ($0.5 million). For Alternative D, major costs are associated with the construction of new dikes and jetties ($28.1 million), dredging and rock removal ($24.1 million), construction of dredge disposal areas ($27.1 million), and environmental mitigation ($23.7 million). Increased O&M costs for Alternative D equal $2.2 million. Average annual costs for Alternative D equal $10.2 million, providing a benefit-to-cost ratio of 1.9. The benefit-to-cost ratio for the 11-foot channel deepening component alone is 0.99. Table E-7 summarizes the information. Annual incremental net benefits would be $8.8 million with Alternative D compared to Alternative B. xxviii
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Alternative E - Navigation Channel Maintenance, Operations Only Flow Management, and 12 Foot Navigation Channel: For Alternative E, annual benefits equal $22.4 million. Annual net benefits equal $9.8 million with the implementation of this alternative as compared to Alternative B. The major economic benefit would come from navigation savings. These savings result from lowering the transportation cost associated with commodities such as grains, chemical fertilizers, gravel, etc. that are able to capitalize on efficiencies by loading barges to a deeper depth. The remaining economic benefits would come from hydropower ($0.5 million). For Alternative E, major costs are associated with the construction of new dikes and jetties ($38.9 million), dredging and rock removal ($30.7 million), construction of dredge disposal areas ($31.7 million), and environmental mitigation ($23.7 million). Increased O&M costs for Alternative E equal $2.8 million. Average annual costs for Alternative E equal $12.5 million, providing a benefit-to-cost ratio of 1.8. The incremental benefit-to-cost ratio for the 12-foot channel deepening component alone is 1.08. Table E-8 summarizes the information.
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