The great news for California in the winter of 2015-2016 is that El Nino-generated storms are on the increase, right? Well , that’s good news for easing the California drought, but with caveats. It’s much greater news if even more rain (and snow) fall in Northern California than in Southern California. The north has more catchment systems than the south. In other words, the north catches, saves and provides more water than the south can.
Why? Northern areas have river systems and reservoirs that redirect water to the south (mainly) via aqueducts. Moisture falling in the south and running off land is more readily fed to the Pacific Ocean, because much of the system there, especially in Los Angeles itself, is allowed and even intended to drain into the Pacific to avoid catastrophic flooding and landslides, like those seen from major storms in the 1930s and later. In other words, the massive waste of freshwater was actually a safety measure. Law was adjusted by climate. Until recently, in fact, it was illegal to capture rain on your own roof in LA. The California Water Capture Act of 2012 eased that outdated policy.
And, fortunately, on Jan. 6 the California State Water Resources Control Board approved a broad plan to capture more rain, The Associated Press reported. About $200 million will fund projects to collect rain, as part of a $7.5 billion water bond voters approved in November 2014. Los Angeles expects to collect an additional 3.3 billion gallons a year from new projects, over the roughly 10 billion it says it collects now. But even that’s a drop in the bucket compared to what SoCal could do in wet years if rainwater collection were made a genuine priority.
Rainwater harvesting regulations state by state – Enlight Inc. blog
Building Sponge City: Redesigning LA for Long-Term Drought – Cities Project, NPR
The Untapped Potential of California’s Water Supply – Pacific Institute and NRDC