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Republican River Basin Water Balance Study

Middle Republican Natural Resources District Board Meeting. with. June 14 | 2011. Republican River Basin Water Balance Study. Matt Lindburg, P.E. and Frank Kwapnioski, P.E. Disclaimer.

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Republican River Basin Water Balance Study

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  1. Middle Republican Natural Resources District Board Meeting with June 14 | 2011 Republican River Basin Water Balance Study Matt Lindburg, P.E. and Frank Kwapnioski, P.E.

  2. Disclaimer This presentation is intended for discussion purposes only.  The information contained herein does not represent the views, conclusions or opinions of the Upper Republican Natural Resources District, Middle Republican Natural Resources District, Lower Republican Natural Resources District, nor the State of Nebraska nor its agencies. Brown and Caldwell and H2Options, LLC | June 14, 2011

  3. Presentation Overview • Study Objectives • Description of Analysis • Results • Uses of the Water Balance • Questions Brown and Caldwell and H2Options, LLC | June 14, 2011

  4. Study Objectives • Achieve a better understanding of the water balance • Understand the full spectrum and extent of water uses • Provide a tool to identify water management opportunities • Identify additional data and research needs • Foster working relationships across state lines • Publish study findings Brown and Caldwell and H2Options, LLC | June 14, 2011

  5. Study Objectives • Water balances were developed for • Each Republican River NRD • The Republican River NRDs combined • Water balances were assessed over • A long term average • Annual time steps • Today’s presentation focuses on the MRNRD Brown and Caldwell and H2Options, LLC | June 14, 2011

  6. Description of Analysis • 2.43 million acres • 2005 land use in the Middle Republican Brown and Caldwell and H2Options, LLC | June 14, 2011

  7. Description of Analysis • Overall land use in the MRNRD (2005) Brown and Caldwell and H2Options, LLC | June 14, 2011

  8. Description of Analysis • The MRNRD receives 20.8 inches of annual precipitation on average Brown and Caldwell and H2Options, LLC | June 14, 2011

  9. Description of Analysis • Irrigation wells help agricultural producers weather the variability in precipitation supplies Brown and Caldwell and H2Options, LLC | June 14, 2011

  10. Description of Analysis • The MRNRD has experienced minor long term groundwater aquifer declines Brown and Caldwell and H2Options, LLC | June 14, 2011

  11. Description of Analysis Inflow – Outflow = Change in Storage Inflow – Outflow – Change in Storage = 0 Brown and Caldwell and H2Options, LLC | June 14, 2011

  12. Description of Analysis • We processed a lot of data • Consumption • Precipitation • Streamflow • Groundwater storage • Surface water storage • Data was available from public sources • NDNR • University of Nebraska • COHYST Raw Data Processing Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  13. Description of Analysis • Quantification of surface water inflow and outflow incorporated several stream gages and statistical relationships Brown and Caldwell and H2Options, LLC | June 14, 2011

  14. Description of Analysis • Mapping program used to quantify data • Program allows the user to overlay layers of mapping data (i.e. land use, study area boundary, etc.) and perform calculations • Used study period of 1955 – 2005 • Availability of historic data varied • Some aspects of basin hydrology changed around the time Harlan County Reservoir was constructed Brown and Caldwell and H2Options, LLC | June 14, 2011

  15. Description of Analysis Brown and Caldwell and H2Options, LLC | June 14, 2011

  16. Results • Water balance for MRNRD based on recent land use and streamflows • Consider this to be a snapshot of present conditions Brown and Caldwell and H2Options, LLC | June 14, 2011

  17. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  18. Uses of the Water Balance • Set or evaluate water management goals • Help guide detailed modeling analyses • Assess relationships among the water balance components Brown and Caldwell and H2Options, LLC | June 14, 2011

  19. Uses of the Water Balance • Develop a detailed understanding of all water budget components • Example – consumption Brown and Caldwell and H2Options, LLC | June 14, 2011

  20. Results • Components of Average Annual Consumption (1950 – 2005) based on 2005 Land Use Brown and Caldwell and H2Options, LLC | June 14, 2011

  21. Uses of the Water Balance Brown and Caldwell and H2Options, LLC | June 14, 2011

  22. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  23. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  24. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  25. Improvements to the Water Balance • Updates to the water balance and new information Brown and Caldwell and H2Options, LLC | June 14, 2011

  26. Improvements to the Water Balance Brown and Caldwell and H2Options, LLC | June 14, 2011

  27. Conclusions • The water balance for the MRNRD was quantified with a relatively high degree of accuracy. • Our understanding of the balance can be improved over time. • As necessary, more complex estimations of water balance components can be conducted. • Majority of supply used by native vegetation and dryland crops. • Minor water level declines have occurred due to land use changes, one of which is conversion to irrigated crops • Surface water outflows are related to surface water inflows • A water balance could help identify ways to accomplish water management goals. Brown and Caldwell and H2Options, LLC | June 14, 2011

  28. Questions • Thank you! Brown and Caldwell and H2Options, LLC | June 14, 2011

  29. Uses of the Water Balance Brown and Caldwell and H2Options, LLC | June 14, 2011

  30. Description of Analysis • MRNRD Irrigated Crops (2005) Brown and Caldwell and H2Options, LLC | June 14, 2011

  31. Description of Analysis • MRNRD Dryland Crops (2005) Brown and Caldwell and H2Options, LLC | June 14, 2011

  32. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  33. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  34. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  35. Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  36. Draft Results Brown and Caldwell and H2Options, LLC | June 14, 2011

  37. Draft Results • Average Annual Water Balance under Existing Land Uses - Republican River Basin Brown and Caldwell and H2Options, LLC | June 14, 2011

  38. Uses of the Water Balance • Republican River basin-wide land use (acres) Brown and Caldwell and H2Options, LLC | June 14, 2011

  39. Uses of the Water Balance Brown and Caldwell and H2Options, LLC | June 14, 2011

  40. Brown and Caldwell and H2Options, LLC | June 14, 2011

  41. Brown and Caldwell and H2Options, LLC | June 14, 2011

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