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1. Stormwater Runoff Catchments: Santa Clara County, California, 2008

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.).

2. Subwatershed Boundaries, California (12-digit HUC), 2013

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.

3. Sphere of Influence for Napa County Flood Control District

2010. Vestra Resources Inc. Redding CA. Sphere of Influence for the Napa County Flood Control and Water Conservation District. Napa County (Calif.). County Of Napa.

4. Napa County Flood Control District

2005. VESTRA Resources Inc. Boundary of the Napa County Flood Control District. Napa County (Calif.). County Of Napa.

5. Water Districts in Napa County

2002. Vestra Resources Inc. Redding, CA. Boundaries of the ten Water Districts in Napa County. Napa County (Calif.). County Of Napa.

6. Hydrologic Sub-Area Boundaries: Russian River Watershed, California, 1999

1999. Circuit Rider Productions. This polygon dataset represents the Hydrologic Sub-Area boundaries for the Russian River basin, as defined by the Calwater 2.2a watershed boundarie... Circuit Rider Productions.