[leakinInTheBlueSea]

Any digital video production experts here? Looks to me like it might be exposure related... like maybe the sun peeked through and overexposed the water in the clip that looks clean? Even the river as it exits the pic is brown in the one pic, as it is in most pics... but in the clean one, even the river looks clean there, and it shouldn’t as there is still lots of turbulence where the spillway dumps into the river that kicks up sediment.

[janetjanet998]

you can also see a small muddy stream to the left(on the left of what was the main spillway towards the bottom) in the second shot .

it was raining and cloudy all day

[EarthResearcher333]

Images sharpened, then compared in color spectral density processed on high end computer system/graphics high DPI w/32bit color . Results are is that this is not an exposure change but a real coloration change in the water. The circled image areas were analyzed (spectrally). What is also an independent proof is that the coloration of the side stream to the left maintains its same hue/saturation/contrast etc while the brown color flow on the outside of the main spillway sidewall turned brown (compare left circles in both images). This indicates a soil erosion "burst" in the main spillway hole cavitation/hydraulic turbulence upstream.