During the last drought, I made about 85 posts on the issue, pointing out the drought history of the region was chaotic, with dry periods and wet periods, with some very long dry periods. In those posts, I supported the need for more dams to catch and store the feeble about of moisture collected during the dry periods, including the Centennial Dam Project.
This drought timeline tells the story of drought in the region;
California is relatively drought-free right now, but if history is an indicator of the future we will have more drought.
H/T to Watts Up With That for links to the Graphics.
If you are interested in learning more about drought and flooding in the region, I recommend The West Without Water and books by Anthropologist David L. Stuart on the struggle of the Pueblo Peoples to survive in the South West. Our relatively wet period could be coming to an end and California is not prepared. Thousands of thirsty people and potential toilet flushers are streaming across our borders and we are not expanding our water management infrastructure to deal with the expanding population of illegal immigrants.