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Use of Available Information to Infer Groundwater-Surface Water Interactions

Use of Available Information to Infer Groundwater-Surface Water Interactions - Practical Examples from BC. Jacek Scibek M.Sc. OUTLINE:. BC observation well network – examples of water levels and interactions with surface water

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Use of Available Information to Infer Groundwater-Surface Water Interactions

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  1. Use of Available Information to Infer Groundwater-Surface Water Interactions - Practical Examples from BC Jacek Scibek M.Sc.

  2. OUTLINE: • BC observation well network • – examples of water levels and interactions with surface water • Delineating areas of aquifers where GUDI wells are likely to occur • Aquifer heterogeneity

  3. Cassidy Aquifer (Nanaimo) Example 1: Nanaimo River gauge Obs 330 Nanaimo River Obs 312 CASSIDY Obs 228 N

  4. Obs 330 Nanaimo River Obs 312 Obs 228

  5. Obs 330 Obs 312 Recovery event Wellfield drawdown

  6. Nanaimo River Obs 312

  7. Wells near rivers are potentially GUDI Obs 330 Obs 312 Nanaimo River Obs 228

  8. 318 River Gauge 211 204 205 Cowichan River Valley (Duncan) Example 2:

  9. Note flow magnitude in river!!

  10. Rough sketch of area of interaction of groundwater with surface water

  11. Grand Forks Valley Example 3: Obs well Kettle River

  12. Effect of aquifer heterogeneity on connection with surface water: head difference map = Aquifer Scenario 1 – Aquifer Scenario 2 (homogeneous K) (heterogeneous K) 0 m River recharging aquifer + 0.5 m - 0.5 m Aquifer discharging to river

  13. Fraser Valley (Abbotsford) Example 4: No GUDI wells up-gradient from rivers? How far? Stream leakage?

  14. Complex flow patterns (modeling results)

  15. CONCLUSIONS: • Available information: • often not used • significance missed • objective is to avoid expensive tests done that confirm what is already known • BC observation well network • free source of data • most wells too close to rivers to help characterize aquifer behaviour

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