In fact, I saw a source (I forget where, sorry) that said this 16.5 million acre-feet estimate was calculated a time of historically large river flow. So it's n

In fact, I saw a source (I forget where, sorry) that said this 16.5 million acre-feet estimate was calculated a time of historically large river flow. So it's not just that the flow is going down, it's that the original projection was based on an unrealistic target, even back then!