Dozens of rescues are underway as relentless rainfall triggers dangerous flooding across Texas, with more rain in the forecast.

After deadly floods killed more than 100 people in Texas' Hill Country last July, officials vowed major changes in hopes of preventing the failures that contributed to the high death toll.

Nearly 1 trillion gallons of water fell on the three hardest-hit counties in Texas over three days — Uvalde County alone got more rain in that period than California has seen over the last month, acco...