ArkNavReport_TOC_Acronyms_ExecSummary.doc

This component set explores the options of deepening

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This component set explores the options of deepening the navigation channel to 10, 11 or 12 feet and widening the Verdigris River portion of the system from 150 feet to 300 feet wide. To better assess the navigation channel deepening components, the MKARNS was divided into six river segments, from the mouth of the navigation system at the Mississippi River to the Port of Catoosa in Oklahoma. The six segments were selected based on locations of major ports and/or quarries. This makes analysis of the action comprehensive and flexible by providing the option of deepening the navigation channel only up to a certain segment on the system or the entire river, as appropriate. The evaluation process for this feature included five components: Component 1: No Action Component 2: Navigation Channel Deepening to 10, 11, and 12 feet via Dredging and Training Structures, Component 3: Navigation Channel Deepening to 10, 11, and 12 feet via Pool Raising, Component 4: Navigation Channel Deepening to 10, 11, and 12 feet via a combination of Dredging, Training Structures, and Pool Raising, and Component 5: Verdigris River Navigation Channel Widening from 150 feet to 300 feet. Component 1 - No Action. This component would take no action to deepen the channel or widen the Verdigris River. xviii
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Component 2 - Navigation Channel Deepening to 10, 11, and 12 feet via Dredging and Training Structures. These components consist of evaluating the deepening of the channel to 10, 11, or 12 feet at up to six separate segments of the MKARNS. Net benefits are defined as the total benefits minus total costs of the component. Negative net benefits indicate that total costs are greater than total benefits. Likewise, benefit to cost ratios (BCR) less than one indicate total costs are greater than total benefits. A BCR greater than one indicates that total benefits are greater than total costs. Total project cost for the 10, 11, and 12-foot channel is $97,053,100, $129,426,600, and $158,459,300, respectively. Table E-4 summarizes the net benefits of the channel deepening components. Table E-4 Summary of Net Benefits of Final Channel Deepening Components Navigation Depth Mouth to River Segment Component Mouth to Pine Bluff Mouth to Little Rock Mouth to Dardanelle Mouth to Fort Smith Mouth to Muskogee Mouth to Catoosa N.M. 0.0 to N.M. 75.2 Reach 1 N.M. 0 to N.M. 119.5 Reaches 1-2 N.M. 0 to NM. 220.3 Reaches 1-3 N.M. 0 to N.M. 308.7 Reaches 1-4 N.M. 0 to N.M. 394.0 Reaches 1-5 N.M. 0 to N.M. 444.8 Reaches 1-6 No Action BCR Net Benefits ($) N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 10 Foot Channel BCR Net Benefits ($) 0.15 -1,907,500 0.18 -2,407,100 0.28 -2,629,900 0.23 -3,532,100 0.20 -5,326,500 0.51 -3,815,500 11 Foot Channel BCR Net Benefits ($) 0.39 -1,475,900 0.47 -1,693,100 0.62 -1,613,300 0.52 -2,649,800 0.39 -5,319,100 0.99 -33,700 12 Foot Channel BCR Net Benefits ($) 0.46 -1,495,300 0.56 -1,621,900 0.66 -1,807,100 .0.53 -3,266,900 0.43 -6,097,600 1.08 1,009,800 The following summarizes the findings: Economic benefits of deepening the navigation channel are achieved primarily by deepening the entire system and not portions of the system. Approximately two thirds of the benefits are realized in the upper most reach, Reach 6. The large quantity of grains going out of the
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