Hydrological Persistence
http://inspire.ec.europa.eu/codelist/HydrologicalPersistenceValue
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dry
Filled and/or flowing infrequently, generally only during and/or immediately after heavy precipitation.
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ephemeral
Filled and/or flowing during and immediately after precipitation.
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intermittent
Filled and/or flowing for part of the year.
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perennial
Filled and/or flowing continuously throughout the year.
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