Circulating on the Internet is a study by UC Irvine about Valley evaporation feeding storms over Colorado which in turn feed water into the Colorado River.
This water is then returned to LA.
I learned this in high school way back in the 1950s. I also learned the water (fresh water) is lost forever in the chemical reaction when making concrete. The “green” people must have been sleeping when these lessons were being presented because they think dams don’t work and they want to plant trees next to curbs and sidewalks.
Drives me nuts when this concrete is jackhammered out and replaced, and another tree is planted. Water will evaporate no matter where it is. Either Millerton Dam or the Ocean. The more moisture in the air, the more rain, somewhere. Rain cleans the air. Lightning energizes the rain. Rain cannot happen unless it condenses on a particle, AKA, dirty air, dust. Wish the “green” people would go outside more often.