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COHYST 2010

COHYST 2010. A Total Water Budget Approach to Integrated Water Management – Model Overview. COHYST Calibration Workshop January 18-20, 2011 Doug Hallum Nebraska Department of Natural Resources. Our Area of Interest:. Management Objectives:. Model must account for specific things

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COHYST 2010

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  1. COHYST 2010 A Total Water Budget Approach to Integrated Water Management – Model Overview COHYST Calibration Workshop January 18-20, 2011 Doug Hallum Nebraska Department of Natural Resources

  2. Our Area of Interest:

  3. Management Objectives: • Model must account for specific things • Tracking and accounting capable • Incorporate surface water component • Alternatives analysis capable • Make data available to public • Update data to support future refinement • Establish archive protocols

  4. Note : Assumptions and Limitations Every piece of information incorporated into this project has its own unique set of assumptions and limitations. When the modeling team describes the process used to derived the values used; they are describing assumptions and limitations. Explicit limitations on appropriateness, application and use of the model are based on assessment and learning that happens during design and calibration of the tools.

  5. Phases: I: Water Budget • Provides framework for models reflecting gross system changes II: Develop a suite of modeling tools • Captures essential water budget components in time and space III: Develop applied tools - Focuses future work on specific questions/applications required for decision-making

  6. Phased Workflow: Phase I: Derive a temporally variable water budget from available data. Workplan Water Budget Phase II: Design modeling tools using water budget. CROPSIM STELLA MODFLOW Phase II: Calibrate modeling tools using water budget. Phase II: Assess capabilities of calibrated tools to meet objectives. Documentation and Tools Phase II: Design processes to meet objectives where needed. Phase III: Design applied tools Where needed.

  7. The Water Balance Framework: Image from: http://aquacycle.blogspot.com/

  8. The suite of tools: • CROPSM (and return flow function) • In: precipitation, landcover, soils • Out: recharge, runoff, ET, water needs • STELLA • In: stream flow, runoff • Out: routed flow, change sw storage, recharge • MODFLOW • In: recharge, pumping • Out: gw in/out, baseflow, change gw storage

  9. P Watershed Model (CROPSIM)

  10. P Watershed Model (CROPSIM) R ET RO*

  11. P Watershed Model (CROPSIM) SWI Surface Water Model (STELLA) R ET RO*

  12. P Watershed Model (CROPSIM) SWI Surface Water Model (STELLA) R Δ STO* R ET RO* RO*

  13. P Watershed Model (CROPSIM) SWI Surface Water Model (STELLA) R Δ STO* R Groundwater Model (MODFLOW) ET RO* RO* GWI*

  14. P Watershed Model (CROPSIM) SWI Surface Water Model (STELLA) R Δ STO* R Groundwater Model (MODFLOW) Δ STO* ET RO* RO* BF* GWI* GWO*

  15. P Watershed Model (CROPSIM) SWI Surface Water Model (STELLA) R Δ STO* R Groundwater Model (MODFLOW) Δ STO* ET RO* RO* SWO BF* GWI* GWO*

  16. Process Conclusion: • The process is complete when baseflow plus runoff is equal to total flow. • Q: Total flow changes daily; What is our approach? • A: Model a dynamic water budget. (Annual budget terms to get started)

  17. Review - dynamic water budget: • Precipitation • Surface Water: • In • Out • Storage Change • Groundwater • In • Out • Storage Change

  18. Precipitation:

  19. Surface Water:

  20. Groundwater

  21. Atmosphere P Land Surface ΔSTO Aquifer ΔSTO ET SWI SWO GWI GWO

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