Theory
i'm going to throw out a theory here. i might be missing something.
Could a small comet have hit the area, at a semi-shallow angle, scattering debris including ice/slush to the top left of the picture. The new dust ejected from the impact would not be very hard packed, so it wouldn't take a lot of water from the comet to make the gullies. The water then simply soaked into the ground. The apparent water could be an anomaly rather than evidence of widespread water on Mars.
Thank you, that is all.
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