Although I was doing a lot of work on the chalkboard, I am hoping that most of my points will be clear on the audio I made [23MB MP3]. (Unfortunately, the batteries ran out after one hour and five minutes, but you are sure to get enough material by then.)
You can read this, this and this post to get an idea of what I discussed.
There were two things I was unclear on.
First, how much water is currently exported from the Delta? I know that the CVP and SWP average 10MAFY, but I am guessing that they have been averaging a lot less recently. Is there a site that tracks historical deliveries from these two projects?
Second, how much water does SoCal have from other sources?
- The LA aqueducts have capacities of 485 + 290 cfs. Given that 1cfs = 724AFY, those aqueducts could deliver 560TAFY, but I think that LA has been getting about half that -- due to the environmental problems in Owens Valley.
- The Colorado River aqueduct has a capacity of 1.3MAFY and delivers about that much to MWDSDC.
- The All-American canal has a HUGE capacity (26,155 cfs, nearly 19MAFY -- twice the California aqueduct and the biggest aqueduct in the US), but it can't deliver more than the 3.85MAFY of rights held by the irrigation districts (not including PVID) that use it.
- The San Joaquin river carries about 1.8MAFY into the area. Friant Dam is one dam that holds back that water.
Bottom Line: Southern California CAN subsist -- AND thrive -- on "local" water supplies, but we need to know how much water is there AND have markets to reallocate it.