Magenta keeps carrying out experiments to detect the cooling water stream on the data set taken at Frosini Pietre plant. The last experiment regards edge detection. Unfortunately, motion blur in the image makes it hard to recognize a definite edge of the water flowing out from the cut. In the following we show two examples: the first on a conventional image, taken in visible light; the second on a image from the thermal camera (white hot). On the thermal camera the water edges appear to be more intense, but this mostly depend on the difference between the temperature of the background and the water temperature.