Fig. 4. Percent regolith water, by volume, for quarterly soil cores taken in the extreme drought of 2001–2002, and the following wet year of 2002–2003. An arrow indicates the region of the regolith (on average) that is weathered bedrock (WBR) at each site. (a) Data from the healthy coastal sage scrub site at Lake Skinner (+CSS). (b) Data from the degraded coastal sage scrub site at the base of the Box Springs Mountains (–CSS).