Accession Number:

ADA411318

Title:

Risk Analysis of Design-Improvement Alternatives to the Lindy Claiborne Boggs Lock and Dam

Descriptive Note:

Final rept.

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS INFORMATION TECHNOLOGY LAB

Report Date:

2002-12-01

Pagination or Media Count:

48.0

Abstract:

This report summarizes a review and assessment of the Preliminary Hazard Analysis PHA for lower lock approach sediment management improvements to the Lindy Claiborne Boggs Lock and Dam. The review assessed the probability of catastrophic failure during the construction and utilization phases of the lock-improvement alternatives. The Lindy C. Boggs Lock and Dam experiences large water-level fluctuations. To accommodate the large fluctuation of water levels, floating guide walls upstream and downstream of the lock were incorporated into the plans. To retain the riverside lock wall backfill, a concrete T-wall was constructed for a distance of 130 ft 40 m perpendicular from the lock on the downstream end. Anticipating that sediment would deposit in the navigation channel underneath the downstream floating guide wall, provisions were included in the original plans in the form of an earthen dike and a composite I-waIF steel sheetpiling and concrete wall on top of the dike. The I-wall was connected to the T-wall and continued 130 ft offset from and parallel to the floating guide wall for 1,100 fi 335 m. The purpose of the dike and I-wall was to divert the flow and sediment from the floating guide wall and the navigation channel, thus providing a slack- water lock approach channel. Nonetheless, an average of approximately 310,000 cu yd 237,000 cu m of silt has been removed annually from the lower lock approach channel at Lindy C. Boggs Lock and Dam. Three alternative improvements are proposed to control this sedimentation the provision of a new fixed guidewall with dike removal, the provision of a new fixed guidewall with retention of dike, and the barrier extension and use of concrete panels.

Subject Categories:

  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE