ArkNavReport_TOC_Acronyms_ExecSummary.doc

Dikes run perpendicular to the river while revetments

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the river channel alignment by stabilizing or protecting the channel bank line from erosion and caving. Dikes run perpendicular to the river while revetments run parallel. Currently, there are 1,314 existing river training structures and 295 revetments on the MKARNS. Under the 11 or 12-foot component there would be a 7% increase in the number of new river training structures and a 0.3% increase in the number of new revetments along the MKARNS. xx
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The number of new river training structures and revetments for the 10, 11, or 12-foot channel will be the same for each depth, although the size of the structures changes. The number of new and modified river training structures and revetments are as follows: 1-Mouth to Pine Bluff 4 new weirs and 21 modified dikes 2-Pine Bluff to Little Rock 30 new and 4 modified dikes 3-Little Rock to Dardanelle 5 and 34 modified dikes 4-Dardanelle to Fort Smith 6 and 28 modified dikes 5-Ft Smith to Muskogee 44 new and 0 modified dikes 6-Muskogee to Catoosa 0 new or modified dikes Total MKARNS 4 new weirs and 85 new and 87 modified dikes 1-Mouth to Pine Bluff 0 new and 9 modified revetments 2-Pine Bluff to Little Rock 1 new and 0 modified revetments 3-Little Rock to Dardanelle 0 new and 1 modified revetment 4-Dardanelle to Fort Smith 0 new and 6 modified revetments 5-Ft Smith to Muskogee 0 new or modified revetments 6-Muskogee to Catoosa 0 new or modified revetments Total MKARNS 1 new and 16 modified revetments To assess the impacts of deeper draft barges on the existing locks, a prototype test at Lock 2 was conducted by the Corps’ Engineering Research and Development Center (ERDC). This testing at Lock 2 led to the following findings: for barges that draft 11.5´ (the maximum draft on a 12-foot channel depth is 11.5 feet): (1) There will be a negligible chance of the barges striking the downstream lock sill when the minimum expected tailwater depth of 14´ occurs at the MKARNS projects. A minimum 14-foot depth over the lock sills is maintained at all times and is not affected by changes under consideration by this study. (2) It is highly unlikely that the barges will strike the downstream lock sill at Lock #2 due to surging in the canal (surging does not occur at locks outside the Arkansas Post Canal). (3) Some operational changes at Lock #2 will be required in order to reduce the chance of a barge striking the upstream miter gate. (4) With operational changes to slow the movement of heavier barges in and around the locks, the risk of increased damage from barge strikes is minimal. However additional analysis will be performed during the Pre-construction Engineering and Design (PED) phase (5) The current filling and emptying operations will be satisfactory for all the side port system locks, except the Ozark and Webbers Falls projects due to the greater lifts of 34´ and 30´, respectively. It is not anticipated that this will affect the potential for 11.5-foot draft traffic although further modeling will be required. ERDC recommends using the numerical models HAWSER and LOCKSIM to determine the impacts to hawser forces and lock filling and emptying times for these projects.
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