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Other non-classic drainage issues that have an effect on hydrologic unit delineation and subdivision include [[reservoir]]s, diverted waters ranging from small irrigation [[ditch]]es to [[interbasin transfer]]s, islands, and coastal areas with large [[tidal range]]s. The 5th and 6th level hydrologic units, called "watersheds" and "subwatersheds", were assigned one of seven attribute codes to indicate drainage type: standard (classic, one outlet), closed basin (no outlet), frontal (multiple outlets), water (predominately water with adjacent land areas), island (one or more islands and adjacent water), and unclassified (an area that cannot be defined or does not fit one of the other types).<ref name=WBDstandard/>
==See also==
* [[Water Resource Region]]
==References==
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