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COHYST2010 Groundwater Model: Lower Reaches (Odessa, Grand Island). April 15 th -16 th Lincoln, NE Nebraska Department of Natural Resources. COHYST 2010 - Phase II Groundwater Model Losing Reach: Odessa to Grand Island. Reach known to lose part of year Target shows losses, although noisy

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cohyst2010 groundwater model lower reaches odessa grand island

COHYST2010 Groundwater Model:Lower Reaches (Odessa, Grand Island)

April 15th-16th

Lincoln, NE

Nebraska Department of Natural Resources

cohyst 2010 phase ii groundwater model losing reach odessa to grand island
COHYST 2010 - Phase II Groundwater ModelLosing Reach: Odessa to Grand Island
  • Reach known to lose part of year
  • Target shows losses, although noisy
  • Simulated baseflow gain/loss
      • Match gains
      • Don’t simulate losses
cohyst 2010 phase ii groundwater model losing reach odessa to grand island1
COHYST 2010 - Phase II Groundwater ModelLosing Reach: Odessa to Grand Island

Cumulative Flux – Odessa to Grand Island (ac-ft)

cohyst 2010 phase ii groundwater model losing reach odessa to grand island3
COHYST 2010 - Phase II Groundwater ModelLosing Reach: Odessa to Grand Island
  • Reasons?
    • Simulated stages reasonable
    • Simulated aquifer heads high (~5 ft based on obs wells in vicinity)
    • Initial (head) condition high?
    • Non-stream discharges too low (pumping, GW/surface ET)
cohyst 2010 phase ii groundwater model losing reach odessa to grand island4
COHYST 2010 - Phase II Groundwater ModelLosing Reach: Odessa to Grand Island
  • Purposes/use of GW model:
    • Depletions analysis
    • CycleWell (hydrologic connection) analysis
  • How much does mismatch at this reach matter?
    • Non-linearity from drying up STR