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| MOST APPLICABLE GEOGRAPHIC |
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| REGIONS |
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| Ø | Rainfall occurs
regularly |
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| Ø | Rainfall
predominant precipitation |
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| Ø | Rainfall exceeds
20 inches |
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| Ø | Northwest Wheat
and Range Region (NWRR) |
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| special case |
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| Ø | West problem area
because of infrequent |
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| storms |
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