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The NAS Report: Where to from here?

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Presentation on theme: "The NAS Report: Where to from here?"— Presentation transcript:

1 The NAS Report: Where to from here?
David Maidment Center for Research in Water Resources University of Texas at Austin

2 Major Questions in NAS Report
How to define soundness of ecological environment in Texas How to form a conceptual model that links characteristics of ecological environment with characteristics of streamflow

3 Scientific Principles for Definition of Environmental Flows
Representatives of three committees who worked on this subject Andy Sansom (Study Commission on Water for Environmental Flows) Paul Montagna and George Ward (Science Advisory Committee) David Maidment and Kirk Winemiller (National Academy Committee) Written statement on this subject is in your conference packet

4 General Scientific Principles
Ecological integrity is ensured by sustainability of natural resources Field measurements are key Scientific inference needed to establish relationship between ecological integrity and environmental flows Adapability of assessment procedures

5 Principles for Instream Flows
Unified approach to ecological assessment considering both water quantity and quality Existing criteria for aquatic life use in Texas water quality regulations help define ecological soundness Build on existing procedures

6 Aquatic Life Use Categories: Excellent High Intermediate Low
Aquatic Life Attributes: Habitat Characteristics Species Assemblage Sensitive Species Diversity Species Richness Trophic Structure All the main rivers and streams of Texas have been classified using this structure and the results are documented in the Texas Administrative Code Defines “how good is good enough”

7 Streamflow Characteristics
Frequency of peak flows Flow Frequency of instream flow pulses Base flows Subsistence flows Time

8 UT Streamflow Characteristics Project
409 gages with 20 years of record and defined peak flows

9 Bay and Estuary Flows Build on existing monitoring and modeling studies Characterize ecological integrity using measures of habitat Consider multiple stressors: erosion, pollution, altered flows, development, extractive uses, navigation projects

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