bz,

No knucklehead that I can see. \:\)

I came to the conclusion after reading all this that we are not measuring average DO across the entire water column...if we did it would show a definite increase in DO...that's my theory

If you bring bad water to the top, where it adsorbs more oxygen and you do that over a long time...well my instincts say we are not measuring average DO across the water column properly or it would show an increase in that average DO. We are probably only measuring DO at specific shallow water locations.