I didn't want to hijack the thread from jfw about dead Asian Carp. How does the Corp decide how much dam and which dam to release water?

I've never understood why they'd have 16 feet coming out of the lower and have the upper completely shut down. Makes no sense to me but I don't know what parameters they use. I'd think they'd keep at least some flow coming from the upper to eliminate the upper from becoming all scummy and nasty up there. Guess that's not their concern.

I am aware that the primary goals are shipping and flood control and fishing is not even a concern.


Anybody have any insight on the decision making process on how much and which dam they have open?