A decade ago, Corpus Christi’s regional water plan projected shortages as soon as 2050. The next plan, released five years later, shortened that timeline to 2030. Something’s not right with the calculations that underpin these plans, said John Michael, an engineering executive who has worked on local water infrastructure for 44 years. “Whether it’s climate change or something else, our reservoir system is not as dependable as we once thought,” he said at his office in May.