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The Spokane Valley – Rathdrum Prairie Groundwater Flow Model Results of simulations Akram Hossain

The Spokane Valley – Rathdrum Prairie Groundwater Flow Model Results of simulations Akram Hossain Civil and Environmental Engineering, Washington State University. Scenario 1

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The Spokane Valley – Rathdrum Prairie Groundwater Flow Model Results of simulations Akram Hossain

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  1. The Spokane Valley – Rathdrum Prairie Groundwater Flow Model Results of simulations Akram Hossain Civil and Environmental Engineering, Washington State University.

  2. Scenario 1 A 10% reduction in well flow for some selected wells accompanied by a 10% reduction of return percolation from landscaping for the months of April – October of 1990 – 2005.

  3. The Wells

  4. Return flow locations

  5. Head Difference: Layer 1: Sep 1995

  6. Head Difference: Layer 1: Sep 2000

  7. Head Difference: Layer 1: Sep 2005

  8. Layer 1 head difference For layer 1, head difference is within 0.6 feet (ft).

  9. The Rivers

  10. Spokane River Gain at Greenacres due to reduction in well flow No gain or loss.

  11. Spokane River Gain at Sullivan Road due to reduction in well flow An approximate gain of 0.2 – 1.2 cubic feet per second (CFS) with an average of 0.6 CFS is predicted.

  12. Spokane River Gain at Spokane gage due to reduction in well flow An approximate gain of 2.2 – 27.2 CFS with an average of 12.3 CFS is predicted.

  13. Spokane River Gain near Long Lake due to reduction in well flow An approximate gain of 2.2 – 28.1 CFS with an average of 12.5 CFS is predicted.

  14. Little Spokane River Gain “near Dartford” (Painted Rocks) gage due to reduction in well flow An approximate gain of 0.3 – 1.0 CFS with an average of 0.6 CFS is predicted.

  15. Summary • Layer 1 head difference • Head difference is within 0.6 ft. • Spokane River • Average gain at Sullivan Road is 0.6 CFS. • Average gain at Spokane gage is 12.3 CFS. • Average gain near Long Lake is 12.5 CFS. • Little Spokane River • Average gain “near Dartford” (Painted Rocks) gage is 0.6 CFS.

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