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Inflows from Tributary Basins, Adjacent Uplands, and Lakes

Spokane Valley – Rathdrum Prairie Aquifer Study. Inflows from Tributary Basins, Adjacent Uplands, and Lakes. Presented by Gary Johnson Lindy Murray University of Idaho Idaho Water Resources Research Institute. The Needs:.

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Inflows from Tributary Basins, Adjacent Uplands, and Lakes

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  1. Spokane Valley – Rathdrum Prairie Aquifer Study Inflows from Tributary Basins, Adjacent Uplands, and Lakes Presented by Gary Johnson Lindy Murray University of Idaho Idaho Water Resources Research Institute

  2. The Needs: • Precipitation in high elevations surrounding SVRP produces inflow to the aquifer through: • Small, ungaged streams and associated alluvial valley ground-water inflow • Lake seepage • Need to understand • Quantity of inflow from above sources • Variations in flow over time • Conceptual nature of aquifer and lake interaction

  3. Significance of Tributary Inflows

  4. SVRP Tributary Basins

  5. Inflows from Tributary Basins(not including lakes)

  6. Need to Estimate • Average annual inflow of water • Surface and subsurface inflow • Unmeasured flows • Assumed to recharge SVRP aquifer • Variation in inflow over time • 1990 through 2005 period

  7. Approach • Average annual flow for each tributary basin estimated from USGS Streamstats • Monthly variation determined from an index to Little Spokane River

  8. USGS Streamstats • Estimation method: USGS Streamstats • Based on correlation of flow to meteorological characteristics, basin size, elevation, vegetative cover, aspect, etc. • Regression relationship developed for regions • Product used: average annual runoff • http://water.usgs.gov/osw/streamstats/idaho.html

  9. Comparison of Streamstats to Gage Records

  10. 90 92 94 96 98 00 02 04 Estimating Monthly Variation Little Spokane River Used as an index Q(month)=Q(avg)*LSR(month) LSR(avg)

  11. Recharge from Lakes • Recharge estimated from inflow-outflow analysis • Hayden, Spirit, Twin Lakes, Hauser, Newman, Liberty, Fernan • Recharge estimated during model calibration • Coeur d’Alene, Pend Oreille • Inflow-outflow not possible

  12. Inflow-Outflow Analysis Stream Inflow (StreamStats) Precipitation Evaporation Lake Overflow Seepage Aquifer

  13. Spirit Lake Overflow

  14. Hayden Lake Overflows

  15. Seasonal and Year to Year VariationsExample: Hayden Lake Water Budget

  16. Example Lake Water Budget

  17. Representation in Model • Fixed flux recharge • Monthly distribution estimated from Little Spokane River Index • Lake seepage for Fernan, Hayden, Spirit, Twin Lakes, Hauser, Newman, and Liberty Lakes • Recharge location • Model cells associated with tributaries or lake boundaries

  18. Lake Pend Oreille • Strong evidence of seepage to aquifer • Seepage varies with lake stage • Nearby wells show similar response • Difficult to reliably estimate rate of seepage • Estimated seepage determined during model calibration to be about 80 cfs

  19. Lake Pend Oreille Well 236 Well 234 90 92 94 96 98 00 02 04 236 234 Pend Oreille Well-Lake Correlation

  20. Lake Coeur d’Alene • Mixed evidence of seepage effects on aquifer • Estimated seepage determined during model calibration to be about 130 cfs

  21. Coeur d’Alene Lake Well 143 Well 159 143 159 Correlation of Lake Stage and Well Water Level?

  22. Results from Marcy (2006)

  23. Estimated Recharge from Lakes Estimated during model calibration Estimated from StreamStats

  24. Comparison with Previous Estimate

  25. Summary • Lakes and tributary basins provide significant recharge to SVRP aquifer • Model estimates based on USGS StreamStats procedure • Seasonal and year-to-year variation estimated by using Little Spokane River index • Coeur d’Alene and Pend Oreille estimated seepage determined during model calibration

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