Took some video tonight with the little hand-held Vado HD.
First one is from the shore. The digital zoom is on since this camera has a really wide-angle lens and the float seemed very small. Watched a few other videos on YouTube and the "boil" that others get is much larger - but I still think I get a very strong outflow current (video of that later).
Jumped in the canoe and headed over. Against my better judgement I stood up in the canoe to get above the upwelling. (SWMBO would kill me if I dunked her camera) Probably 10' away and camera is 5' above water.
Same setup as before but almost directly overhead...
Lastly, I tried to capture the effect of the outflow current.
Setup for this - aim canoe straight at upwelling with a couple of easy paddles (half walk speed or less). Watch the underwater weeds as I approach (may need HD to see them well). They are being "blown" by the water current. Then as I enter the bubble zone I aim the camera at the bubbles and hold it steady. I'm not zooming out - that is the current from the outflow pushing the canoe backwards. It stopped my forward progress(drift) and pushed me sideways.
I guess in the end, the proof will be in the results. Stink coming out of the foam is less tonight, so it would seem that it is starting to improve in that regard.