“Bring on the Rain” by Josh Roseman takes place sometime in the mid-22nd Century, years after Earth had been hit for two days by a solar flare, killing three-quarters of the population and rendering all the surface water undrinkable. William is part of a fleet of land ships that constitute Demetrius Colony, nomads that scour the desert surface, looking for big rain storms. He is in charge of computer models that predict when they will occur. It’s a nasty world in which competing colonies fight vicious battles over water and we get a taste of it in this well-written story.
I found this SFRevu Review of “Bring on the Rain”. I particularly like the description of a “nasty world”.