The Sacramento Bee ran an infographic I liked showing the cost and benefits of proposed water infrastructure projects in California. I reposted it below. These estimates appear to be quite rough, but they give a useful indication of the value of different projects. I did some simple division to make the bar chart below comparing the costs of the various projects. The bar chart is made by dividing the cost estimate ($) by the increased water supply in dry years (acre-ft/year). It appears clear that if our goal is increased water supply in drought years, Shasta Dam raise and Sites Reservoir are the most cost-effective options. The other projects appear to be much more expensive drought mitigation projects. For water supply in average rain years, the San Luis Dam raise looks much more attractive. Having said that, San Luis Dam raise should not be sold as a drought supply measure. Los Vaqueros dam raise and Temperance Flat Dam aren't worth doing at all.
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