Not relevant. The US Army Corp & DNR studied this in the 50s and 60s. It’s not feasible to get water from the Columbia, eel, or Klamath rivers to central or Southern California. As parent mentioned there are too many mountain ranges in the way and nuclear tunneling didn’t even pass muster then. Why would the US go to BC when it already flows in to WA & OR, and is still too isolated from CA populations?