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Norman D. Johns, PhD, National Wildlife Federation Warren Pulich, PhD, Texas State University

Bays in Peril: A Natural Inflow Approach for Texas Estuaries. Norman D. Johns, PhD, National Wildlife Federation Warren Pulich, PhD, Texas State University. general.

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Norman D. Johns, PhD, National Wildlife Federation Warren Pulich, PhD, Texas State University

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  1. Bays in Peril:A Natural Inflow Approach for Texas Estuaries Norman D. Johns, PhD, National Wildlife FederationWarren Pulich, PhD, Texas State University

  2. general “managing an ecosystem within its range of natural variability is an appropriate path to maintaining diverse, resilient, productive, and healthy systems” (Swanson et al. 1993) flows Maintain “full natural range of variation of hydrologic regimes...”measured by – timing, frequency, duration, and rate of change of key biologically significant hydro events (Richter et al. 1997) The Natural Flow Paradigm

  3. 3 step

  4. Corpus Christi Caller-Times, Sept. 24, 2003

  5. 3 step

  6. Galveston Bay Measured Freshwater Inflows High Variability is Inherent

  7. Shrimp & Freshwater Inflows

  8. productivity maintenance-4 month spring/early summer freshwater inflow pulse (a.k.a. “Freshete”) 1. NWF’s Ecologically Relevant Inflow Criteria

  9. Oysters & Freshwater Inflows

  10. productivity maintenance-4 month spring/early summer freshwater inflow pulse (a.k.a. “Freshete”) 1. 2. droughtanalysis – 6 consecutive months very low-inflows, between Mar. – Oct. NWF’s Ecologically Relevant Inflow Criteria

  11. WAM = Hydrology Tool - predict inflows - differing scenarios: Natural ConditionsCurrent UseFull Water RightsLevels of reuse - monthly results

  12. Assessing Springtime Freshwater Pulse

  13. Degree of Alteration = 60%

  14. National Wildlife Federation Analysis of Estuary Inflows productivity maintenance- spring Freshete droughtanalysis - population survival

  15. NWF’s Low Flow Assessment [ MinQsal ]

  16. Degree of Alteration > 500%(high)

  17. Next Steps Application to Regional Planning Process Refinement of Criteria (time window, benchmark volumes based on natural stats.) Further examine ecological relevance ofcriteria

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