NASA Finds Evidence of Recent Flowing Water on Mars

SonicSpike writes to mention that Scientists are claiming that they have evidence of water flowing on Mars within the last five years. From the article: "Subsurface aquifers or melting ground ice were floated as possible sources of the water. One of the springs even appears at a fault line, according to Malin, just as they often do on Earth. The shortness of the gulleys, which seem to flow for but a few hundred yards, might be accounted for by a process similar to a volcano's eruption on Earth, with water instead of magma building up underground, and ice, instead of fire, characterizing the resulting flow."

Comments

Flow Means Bi-directional Movement

[moehoward]

For water to flow, it has to have gotten to the source of the flow first. So, there has to be a mechanism for transport back to the source of the flow. Like rain moves water on Earth back to higher ground. The article offers no speculation on this transport mechanism. I would, of course, suspect evaporation and then dew/frost. But, that would be picked up easily from our probes and even from Earth-based observation.

What am I missing here?