unimpaired drainage network (Deitch, Merenlender,
and Feirer 2013). When we compare other important Mediterranean-
climate grape-growing regions of the world, none face these kinds of
constraints for the protection of native salmon.
Spatial Patterns of Diversion
Extraction methods for meeting rural water needs tend not to be con-
centrated in one location; they also are not evenly distributed in space.
For example, in Mill Creek (a tributary to Dry Creek in Sonoma
County), vineyards are concentrated in the headwaters and the lower
portion of the watershed, where