2013. Wyoming Geographic Information Sciences Center. This polygon shapefile contains the 6th level, 12-digit hydrologic unit code (HUC) sub-watershed boundaries of California. This layer consists of g... Wyoming Geographic Information Sciences Center.
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2015. Santa Clara Valley Water District (Calif.). This polygon shapefile depicts boundaries of Stormwater Runoff Catchments for outfalls greater than or equal to 18 inches in diameter, in the Count... Santa Clara Valley Water District (Calif.).