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Agenda Item 5B

Agenda Item 5B. CVFPB Permit No. 18313-4 Southport Levee Improvement Project Floodplain Restoration West Sacramento Area Flood Control Agency (WSAFCA). July 25, 2019. Presented by: Connie Perkins, Senior Engineer Central Valley Flood Protection Board. Project Location. Project Footprint.

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Agenda Item 5B

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  1. Agenda Item 5B CVFPB Permit No. 18313-4 Southport Levee Improvement ProjectFloodplain RestorationWest Sacramento Area Flood Control Agency (WSAFCA) July 25, 2019 Presented by: Connie Perkins, Senior Engineer Central Valley Flood Protection Board

  2. Project Location

  3. Project Footprint

  4. Project Description • Second phase of the Southport Levee Improvement Project • Applicant proposes to: • Planting vegetation on the slope of the remnant levee and in the areas between the remnant levee and the new setback levee in two areas north and south of Bees Lake; • Establishing tule marsh, emergent marsh, riparian willow scrub, riparian cottonwood forest, and mixed riparian woodland habitats; • Installing temporary irrigation systems until planting is established; and • Maintaining the two restoration areas to satisfy compensatory mitigation requirements.

  5. Project Drawings

  6. Authority of the Board • California Water Code § 8534, 8590 – 8610.5, and 8700 – 8710 • California Code of Regulations, Title 23, Division 1 (Title 23): • § 6, Need for a Permit • § 13.3, Consent Calendar • § 112, Streams Regulated and Nonpermissible Work Periods • § 131, Vegetation • Rivers and Harbors Act of 1899, Title 33 United States Code, §408 (Section 408). • Memorandum of Understanding Respecting the Sacramento River Flood Control Project, November 30, 1953 (between the U.S. Army Corps of Engineers (USACE) South Pacific Division and the State of California, acting by and through The Reclamation Board), and November 29, 1958 Supplement.

  7. Hydraulic Analysis • The hydraulic impacts were evaluated for 3 project conditions: • Initial Project Condition – represented the short period of time immediately after project completion and vegetation has been planted. • Mature Project Condition – assumed the offset area is well-established and mature vegetated state. • Future Project Conditions - assumed four additional breaches have formed in the remnant levee: two in the north and two in the south offset area.

  8. Hydraulic Analysis • Results: • Minimal impact in the initial and mature project conditions and a small impact for future project conditions. • None of the three conditions have upstream impact. • During the design flood, the downstream impacts did not change between initial and mature vegetation project conditions. • A +.05-foot downstream increase is projected for the future condition due to erosion of the remnant levee in certain areas.

  9. Agency comments and endorsements • Reclamation District 900 endorsed the project on April 23, 2016 without conditions. • The USACE Sacramento District Engineer approved the Board’s request through a July 17, 2019 concurrence email, which supplements the August 22, 2016 USACE Headquarters ROD received from the Director of Civil Works.

  10. CEQA Analysis • Based on staff’s review, of the EIRs and the hydraulic analysis, there is no substantial evidence to support a fair argument that the project may result in significant impacts related to flood risk within the Board’s jurisdiction. The project will not adversely impact the State Plan of Flood Control. Based on staff’s review

  11. Recommendations Approve: • Draft Flood System Alteration Permit No. 18313-4; and, Direct: • The Executive Officer to take the necessary actions to execute the permit.

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