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Managing the Columbia River Instream Flows, Water Withdrawals, and Salmon Survival (2004) / Chapter Skim
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Appendix C: Calculations on Annual Discharges of Water from the Columbia Basin Project
Pages 230-234

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From page 230...
... For a comprehensive mass balance on water in the CBP, the components of inflows and outflows may include: Surface Water Inflows = Irrigation Water + Precipitation + Captured natural rim inflows (3) Subsurface Water Inflows = Groundwater Rim Inflows + Seepage Inflow from River (4)
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From page 231...
... Groundwater rim outflows are subsurface flows from the CBP to adjacent lands, and groundwater outflows into river are subsurface accretions of water into the Columbia River. The above components of water flows are typically available only when an irrigation project has been subjected to detailed hydrological investigations and/or hydrological modeling.
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From page 232...
... If one accepts the above assumptions and simplifications, the annual mass balance on water in the CBP may be rearranged to (River Withdrawal + Captured Natural Rim Inflows) ­ (Crop ET + Reservoir Evaporation + Canal & Lateral Evaporation + Operational and Lateral Spills)
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From page 233...
... 1976. Salt and water balance in Imperial Valley, California: Soil Science Society of America Journal 49:93-100.
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From page 234...
... 234 Managing the Columbia River
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Key Terms

  • irrigation drainage
  • water outflows
  • surface irrigation
  • rim inflows
  • surface water

  • columbia river
  • groundwater rim
  • subsurface water
  • irrigation return
  • groundwater outflow

  • return flow
  • groundwater outflows
  • natural rim
  • volume water
  • mass balance

  • closure term
  • lateral evaporation
  • columbia basin
  • reservoir evaporation
  • basin project

  • subsurface inflows
  • lateral spills
  • irrigation water
  • rim outflows
  • captured natural

  • denote subsurface
  • annual mass
  • river denote
  • calculate irrigation
  • seepage inflows


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