Methods to promote freshwater inflow to East Matagorda Bay
This document discusses potential methods to promote freshwater inflow to East Matagorda Bay in order to address elevated salinity and reduced circulation issues. It examines conveying fresh water from various sources, such as Live Oak Creek or Lake Austin, through potential transmission pathways to East Matagorda Bay. Releasing an estimated 16,250 acre-feet of freshwater over 30 days could have a positive impact by reducing salinity levels over 3 to 5 months in approximately 25% of East Matagorda Bay. Further refinement is needed regarding environmental benefits, timing and amount of freshwater flows, associated costs, source water salinity, and permitting requirements. Input is welcomed from various stakeholders to help address this issue.
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Methods to promote freshwater inflow to East Matagorda Bay
- 1. June 21, 2013 Methods to promote freshwater inflow to East Matagorda Bay
- 2. 2 Problem Statement Elevated salinity and Reduced Circulation
- 3. 3 What are we addressing? - What amount of water could provide benefits? - Where to divert the water? - How to convey the water? - What are rough costs? Senate Bill 3 BBASC
- 4. 4 Conveyance Alternative? Live Oak Creek, Lake Austin tributary ≈ ½ mile
- 5. 5 Conveyance Alternative? Lake Austin Natural conveyance or Pipeline/siphon
- 6. 6 Simplest option to infuse fresher water 3 miles 2 miles
- 7. 7 Another option during hypersaline periods < ½ mile
- 8. 8 Possible transmission pathways Scenario 1 Scenario 2 D1 R2 R3 D2 Scenario 3 R1 R4 Scenario 4 Scenario 5 Scenario 6 D3 D5 D4 D6 Scenario 7
- 9. 9 Salinity Goals - Reduce extended periods of salinity greater than 30 ppt - Macrobenthos (Palmer et al.) - Oysters – 2 year average (MBHE)
- 10. 10 Salinity Goals - Promote “Fair” salinity ranges during particular months (MBHE) - 20-23 ppt - Atlantic Croaker (Jan-Jun) - Gulf Menhaden (Apr-Aug) - 20-25 ppt - White Shrimp (Jul-Nov) - Blue Crab (Feb-Jun) - 30-32 ppt - Brown Shrimp (Apr-Jul)
- 11. 11 Salinity Habitat Interface Tool - Maps showing focus area (Hab output and Salinity output) - EMB 1/6 - Lake Austin?
- 13. 13 Salinity
- 14. 14 Salinity % Rank 97pctl 88pctl 63pctl 44pctl 22pctl 05pctl 37% of days above 30 ppt 56% of days above 25 ppt
- 15. 15 Salinity % Rank 97pctl 88pctl 63pctl 44pctl 22pctl 05pctl 15 months 12m 17m 17m 17m 14 months 6m 11m 10m 12m
- 17. 17 MBHE Salinity Model - Animation
- 19. 19 Salinity % Rank 97pctl 88pctl 63pctl 44pctl 22pctl 05pctl16,250 acft 273 cfs 30 days 5 months 30ppt Sep 1 30ppt Feb 6 33ppt Mar 17 Estimated benefit: 3-5 months
- 20. 20 Summary - 16,250 ac-ft of freshwater - Positive impact - 25% of EMB - Three to five months
- 21. 21 Next steps: refinement - Environmental benefits - Timing and amount - Cost (capital and O&M) - Salinity of source water - Freshwater flow available - Permitting - Summary - Recommendations
- 23. 23 We welcome your input! - Colorado/Lavaca BBASC - Texas Water Development Board - Meadows Center for Water and the Environment - US Army Corps of Engineers - Harte Research Institute - Other Stakeholders… Barney Austin baustin@aquastrategies.com Tel: (512) 826-2604
Editor's Notes
- Dr. Larry McKinney Dr. Paul Montagna