| Overview |
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| • | Missoula
Floods 12.5-15ka |
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| • | Willamette
Silts (up to 30 m) cover most of |
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| Willamette
Valley floor |
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| – | confining
unit to Willamette Aquifer |
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| • | WS
has two major effects on groundwater: |
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| – | hydrologically
buffers groundwater in WA |
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| from
surface water and vice versa |
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| – | protects
groundwater from pollutants |
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