UFO Blogger 'Discovers' Belgium On Mars
It's probably just where Matt Damon took a leak.
Not sure, but that doesn't look like water...
Filed under: Air-erosion is a thing!
Those particular "flows" or similar structures seem before, were thought to be flowing sand. Sorry, no reference. But as you noted, they don't look like flowing water.
But a short time ago NASA did report evidence for flowing water in at least one location:
Their evidence is the presence of hydrated salts (crystallized soluble compounds containing water as part of the crystals). Those could only exist on Mars in the presence of a water source, because the atmosphere is so dry the water would quickly leak out of the crystals, leaving behind an anhydrous powder.
The salts are perchlorates, which would be a source of oxygen, independent from the water.
The lineae (dark lines) in Garni crater also look more water-like, to me at least:
Water of crystallization
Compare crystals of hydrated copper sulfate with the anhydrous powder.