1 / 30

LACPR

LACPR. Coastal Wetland Restoration Lessons Learned May 2008. Barataria Basin Future Without Project. -739 acres/yr. LACPR Alternative Restoration Plans. Diversions sized to sustain* - strategy of multiple various-sized diversions - assumed to be the most efficient strategy

yasuo
Download Presentation

LACPR

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LACPR Coastal Wetland Restoration Lessons Learned May 2008

  2. Barataria Basin Future Without Project -739 acres/yr

  3. LACPR Alternative Restoration Plans • Diversions sized to sustain* - strategy ofmultiple various-sized diversions - assumed to be the most efficient strategy • Marsh creation - proposed where diversions do not stop loss - prioritized by system-level importance - not constrained by sediment availability * Synergistic benefits might result in net wetland gains

  4. Diversion Sustained Areas

  5. LACPR Diversion Operations to Reduce Fisheries Impacts Alternative R1 - Annual discharge - Dec through May (6 months) only (white shrimp friendly!) Alternative R2 - One high discharge year every 5 years - No monthly/seasonal discharge restrictions

  6. Comparison of R1 vs R2 Discharges R1 – annual diversions (6 months) R2 – intra annual pulsed diversion

  7. R3 R4 R5 R1 R2

  8. Maximum Discharge Benefits under Increased SLR

  9. Terrebonne Basin Diversions Alternative R1 - Mississippi River diversion to central & east Terrebonne - GIWW diversions* to west Terrebonne Alternative R2 - only GIWW diversions* (east, central, and west Terrebonne) * GIWW diversions utilize Atchafalaya River water * Sized at assumed maximum available discharge – not sustainable

  10. PU3b totals6,200 6,200 3,500 6,200 3,500 13,200 cfs GIWW 76,128 cfs Miss R

  11. PU 3a

  12. PU3a and PU3b Marsh Creation Summary

  13. System Level Planning Considerations • What is our coastal wetland restoration goal? • What is our diversion strategy? • How to allocate Mississippi River resources? • Where do we locate diversions? • How much water do we divert? • When? When TSS highest! • Diversion operation? • How much renewable sediment can be mined from the river? • How can marsh creation be combined most effectively with diversions and other measures?

  14. The End

  15. HET Diversion Priorities Based on System-Level Importance

  16. East Terrebonne Future

  17. Barataria Basin Future Without Project -314 acres/yr

  18. Mississippi River Diversions (cfs) to Sustain Areas under Medium SLR - Suspended sediments assumed typical of Miss. River diversion - GIWW sediments would be only clay and 3x volume needed to sustain Grand Jean East of Lake Bayou LaCroix Bayou Boudreaux Basin Basin Petit Caillou Basin TOTALS Ave flow Max flow

  19. Barataria Basin Future Without Project -404 acres/yr

  20. Barataria Basin Future Without Project -347 acres/yr

  21. HET Diversion Priorities* • Myrtle Grove • Port Sulphur • Upper basin swamp diversions • Davis Pond re-authorization • Buras • Fort Jackson • Bayou Lafourche (1,000 cfs) * assumes siphon operation continued

More Related