Mad Max Fury Road. They defeat the tyrant, and get the control of the water valves. Then they open the valves and seemingly keep them open. One problem, how long is the water reservoir gonna last now?
Logan’s Run. The city dwellers are freed from the computer’s iron-fisted rule, and Carrousel. But their city is in ruins, and thinks to the computer providing everything. They don’t know how to live without it. The city dwellers are going to start dying off real fast.
I read the books and liked them. They’re not especially well written, but they fulfill the same role as a mystery or Jodi picoult book- basically beach reads with awesome world building. If the world itself is kind of ruined for you, there’s not a lot of point to reading them imo. You could always check at a local library though, so you don’t have to commit right away.