California, Dominant type of groundwater aquifer
The map layer was produced by clipping California state limits from the dataset of dominant groundwater features from the Groundwater Resources of the World data set, a product of the World-wide Hydrogeological Mapping and Assessment Programme (WHYMAP) (Struckmeir and Richts 2007). The WHYMAP Groundwater feature containing the largest surface area within an ecoregion was deemed the dominant feature. Groundwater classes are equivalent to classes stated in the WHYMAP data set.

These data were derived by The Nature Conservancy, and were displayed in a map published in The Atlas of Global Conservation (Hoekstra et al., University of California Press, 2010). More information at http://nature.org/atlas.

Data derived from:
Struckmeir, W., and A. Richts. 2007. update of Struckmeir, W., A. Richts, et al. 2006. Groundwater Resources of the World. Hannover, Germany: BGR; Paris: UNESCO. Digital media. 



Citation:
Hoekstra, J. M., J. L. Molnar, M. Jennings, C. Revenga, M. D. Spalding, T. M. Boucher, J. C. Robertson, T. J. Heibel, with K. Ellison. 2010. The Atlas of Global Conservation: Changes, Challenges, and Opportunities to Make a Difference. Ed. J. L. Molnar. Berkeley: University of California Press.
This dataset was used in a scientifically peer-reviewed publication.
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