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Olympic Rainshadow

Ecoregion in WA

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The Olympic Rainshadow ecoregion receives, on the average, only 10 to 40 inches of precipitation each year depending on location. Streams on the till plains have low discharge, and their drainage pattern is often deranged or internal. Its loamy soils tend to retain moisture better than the soils of the San Juan Islands (2c) and support pastureland, cropland, and woodland.

— EPA

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