UFO Blogger 'Discovers' Belgium On Mars
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http://ufosthetruthisoutthere.weebly.com/ufo-blogger-lsquodiscoversrsquo-flowing-water-on-mars.html
It's probably just where Matt Damon took a leak.
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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:
NASA Confirms Evidence That Liquid Water Flows on Today’s Mars
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:
https://www.nasa.gov/sites/default/files/thumbnails/image/15-195_perspective_6.jpg
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an anhydrous powder
Seems legit.
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Water of crystallization
Compare crystals of hydrated copper sulfate with the anhydrous powder.