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

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)

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  1. COHYST2010 Groundwater Model:Lower Reaches (Odessa, Grand Island) April 15th-16th Lincoln, NE Nebraska Department of Natural Resources

  2. 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

  3. COHYST 2010 - Phase II Groundwater ModelLosing Reach: Odessa to Grand Island Cumulative Flux – Odessa to Grand Island (ac-ft)

  4. COHYST 2010 - Phase II Groundwater ModelLosing Reach: Odessa to Grand Island

  5. 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)

  6. 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

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