Regional Vegetation Variance

Transcription

1 Paige Caldwell, P.E. Emergency Manager

2 Overview Key points from the ETL guidance Vegetation variance authority and background Key points of variance guidance Next Steps

3 Key points from the newly revised ETL guidance: Public safety is the number one priority of the USACE Levee Safety Program. This ETL does not establish new standards, but clarifies, and supersedes, those formerly presented in EM (Jan. 1, 2000). An Independent External Peer Review, conducted in 2008, and Independent Technical Review validated the ETL based upon existing and available engineering and scientific data. USACE is currently undertaking a two-year research program to enable reassessment of its engineering-based understanding of the public safety consequences of vegetation on FDR projects.

4 Key points (continued) It is essential that FDR systems retain structural integrity, functionality, and safety; it is also necessary to be able to inspect, monitor, and flood-fight the projects. The local sponsor may request a variance from the standard vegetation guidelines as presented in the ETL. Fifteen feet, or to existing project easement, is the minimally accepted vegetation free zone (VFZ). To date, no research exists to justify a reduction to existing standards. The ETL discusses a limited range of conditions under which a variance to vegetation standards may be granted.

5 Key points (continued) Any addition of landscape plantings to existing FDR systems must comply with the project s Operations and Maintenance manual. New plantings with an engineering evaluation may be approved on a case by case basis. Once new projects are completed, O&M manuals will be updated to reflect requirements for vegetation maintenance. Planned research is intended to compliment the ETL guidance. The use of suitable vegetation, such as shrub forms of willows, riverward of the vegetation-free zone is encouraged as an environmentally beneficial means to moderate erosion potential of water currents and wave action.

6 Levee Section - Basic Sacramento District

7 Levee Section with Ordinary High Water Mark above the Riverside Toe

8 Authority and Background Section 202(g) of WRDA 96 Required the Corps to undertake a comprehensive review of its levee vegetation policy to address regional variations in levee management and resource needs Review included: Examining current policies in view of the varied interests in providing flood control Preserving, protecting, and enhancing natural resources Protecting the rights of Native Americans pursuant to treaty and statute Policy Guidance Letter will supersede ER & EP vegetation variance procedures

9 Requirements Preserve, protect, and/or enhance natural resources, and/or protect rights of Native Americans Maintain the safety, structural integrity, and functionality of the levee Retain accessibility for inspection and flood fighting purposes

10 Contents General description of the levee system Detailed and annotated plans and section drawings Explanation of reasons the proposed changes are necessary to preserve, protect, and enhance natural resources and/or protect the rights of Native Americans pursuant to treaty and statute. What alternatives to a vegetation variance were considered and why the proposed changes were the only feasible means to provide the benefits to natural resources and/or to protect the rights of Native Americans. An engineering analysis showing that the changes proposed will ensure that safety, structural integrity and functionality are retained and accessibility for maintenance, inspection, monitoring and flood fighting are retained. The most recent Routine Inspection Report and Periodic Inspection Report completed by the USACE district. Summary of system performance history for any and all significant flood events. Any National Environmental Policy Act (NEPA), Endangered Species Act (ESA), and any other environmental compliance documentation that the district determines are required in order to conduct the review.

11 Geographic Limits Variances will be considered only for individual levee systems or portions thereof. A levee system consists of one or more segments and associated features which collectively provide flood, storm, or hurricane damage reduction to a defined area. Failure of one feature or segment within a levee system may result in failure of the entire system. Levee systems may consist of embankment sections, floodwall sections, closure structures, pumping stations, interior drainage works, and flood damage reduction channels.

12 Operations & Maintenance During inspections, levees will be rated for vegetation in accordance with approved variances. The associated vegetation management plan and approved variance shall be added to the levee s operation and maintenance manual as an addendum.

13 Coordination with Resource Agencies The district shall notify the appropriate regional offices of the federal resource agencies when a vegetation variance request has been received. The sponsor is responsible for providing all NEPA, ESA Section 7 consultation, and any other environmental compliance documentation required by the district to analyze the request The sponsor must commit to implementation of any measures (such as monitoring, reasonable and prudent alternatives, etc.) needed to comply with ESA before the sponsor may participate, or continue participation, in the Public Law program. Further, the sponsor must commit to bearing the cost for implementation of any measures required to comply with ESA.

14 Limitations No vegetation variance involving woody vegetation, as defined in ETL shall be granted for the following portions of a levee: Upper third of the river-side (or floodside) slope Crown, Land-side (or protected-side) slope Within 15 feet of the land-side (or protected-side) toe (subject to preexisting right-of-way). The vegetation variance process is not a mechanism to validate conditions that have developed as a result of inadequate operation and maintenance. Waterside planting berms are allowed only by approved variance.

15 Rehabilitation Rehabilitation. Any levee repairs, modifications, or improvements made as a result of the emergency event shall be in accordance with current USACE vegetation management standards or approved vegetation variance for the levee system.

16 Review and Approval The timeline for the ATR will depend on the complexity of the request, but will not exceed 90 days unless special circumstances warrant additional time. Approval Authority: HQ Levee Safety Officer

17 Current Variances All existing vegetation variances, agreements, or other deviations, that are not submitted for an ATR via the process described herein, by 30 September 2010, may no longer be considered valid.

18 Next Steps Draft policy guidance letter posted in Federal Register on February 9, day public comment period (ends 25 April 2010) Draft EA/FONSI available at in docket number COE

19 Questions?