I work for USBR, all these are reservoirs we operate. I have engineers working on low water solutions at Glen Canyon (Powell) and Hoover (Mead). There's lots of things going on and my team is just providing input, not making decisions. One thing is Hoover and Glen are part of the black start for the grid, so if they can't generate, it is a nation security issue. There's political pressures because Hoover is so visible and politicians hate the look of the bathtub rings at Mead that all the tourists see. There's looking at things like evap rate based on reservoir levels, sedimentation transport, what facilities can we do maintenance/rehab since water is low, water temps in rivers for native fish species, and tons of things I am not involved in or aware of.