The only thing is that other groups in the LA basin have done EXACTLY that:
http://www.sgvtribune.com/environment-an...heastern-county residents of 43 cities in southern Los Angeles County.
Four million residents from cities within the Water Replenishment District, from Montebello to Long Beach and Torrance to Cerritos, will have a local, reliable water source to boost well-head supplies. Soon, the WRD will no longer have to buy any water from the Colorado River or the Sacramento-San Joaquin River Delta in Northern California,
How did they do it? Stormwater capture, water recycling, conservation.
what I find frustrating is engineering types that inhabit water agencies, and elsewhere, that out-of-hand reject innovation and advancement. They are the types that can provide absolute scientific proof, with many references, that bees cannot fly.
Whereas anyone with eyes in their heads knows that she can.

South LA basin is doing it right now, and expect to be off distant water in 5 years. Cannot northern LA basin do the same?
http://www.wrd.org/news/water-articles.php?url_nws=water-independence-network