The topic is popular, but only now there is information about the availability of water with proper arguments. Using the MRO probe, a scientist from the US Institute of Technology (Georgia) was able to detect dark stripes on the slopes of Mars.
Their peculiarity was that they changed their size depending on what time of the year is now on this planet. Their size also varied - from 50 cm to several meters. Especially stormy they showed themselves in the summer, withered away in the winter or simply decreased.