5 seconds on the first one, and 20 seconds shutter on the 2nd one, works out great. Especially the 20 second exposure on the 2nd shot. The water looks great.
The problem is, you had +1 exposure value. Was that on purpose or by accident? I find my exposure value changed often because my freaking nose hits buttons all the time on the back of my camera. And my nose isn't even all that big! It drives me crazy.
You can see the difference with the sky and the extreme purple fringing in the first 2 photos compared with the 3rd which was EV value of 0. Looks like you had some difficult light as the sky was lit with sunlight, but the river was encompassed in shadow. I guess filters would be the way to correct, as someone suggested above with a polarizing filter.
Take my comments lightly, I don't comment as if I know all because I don't have a dSLR, nor have I been messing with photography very long (here and there for 8 months now). This is just my thoughts about the exposure compensation value. With my camera, I have to have it adjusted at -1EV as it calculates exposure better at that setting.