So, California's Governor Newsom has unveiled his State's water strategy.
The underlying assumption, is that absent intervention, California will lose 10% of its water supply by 2040.
The strategy includes vast new reservoirs to capture storm water/rain water and ensure that it isn't just all sent downstream to the Ocean.
It also includes desalination, but not merely of Ocean water, but brackish groundwater.
Additional 'water recycling' measures are being looked at..........
While conservation measures form a comparatively small part of the proposed solution at ~ 8%; but that still includes removing 500,000,000 ft 2 of ornamental turf (lawn).
That's ~46km2 of lawns. (for the record, I think this is goal is too low, by at least a factor of 10). It also includes removing 500,000 acres of farms from irrigation.
News Story here: https://www.lamag.com/citythinkblog/newsom-floats-massive-new-plan-against-californias-water-crisis/
The Actual Plan for those that are interested here: https://www.documentcloud.org/documents/22130523-2022-8-11-ca-water-supply-strategy
My overall comments: Estimates for California's future water supply are problematic, by and large, estimates have proven too high in the past, and a more conservative projection would be wise.
Part of that is the science of water; but part is the political conflict of more severe water shortages in places like Arizona and Nevada who share the same water supply in part (the Colorado)
I think, at the very least, they should plan for a 15% reduction in order to have more of a safety margin.
The 10% is also misleading, as the water shortage is clearly more acute from the Colorado River diversion and points south, vs the more lush and temperate Northern California.
California already moves water between the two parts of the State and clearly envisions doing more of this in the future.
I'm not keen on this solution, and I would argue moving water between watersheds to create the 'illusion' of abundance is part of how they got into this mess in the first place. A mess that would exist regardless
of Climate Change, but one which is certainly aggravated by that.
I expect, aside from removing a lot more lawn than is proposed (California has 4,000,000, acres of lawns); there will need to be a further reduction in irrigated farm land, more crop-shifting, and probable restrictions on swimming pools.