During Hurricane Harvey, Buffalo Bayou Park was inundated with floodwaters. Mountains of sand and debris littered the park’s western end. Yet within a week, joggers returned to the trails and the restaurant was up and running. The relatively fast reopening signals how urban planning mitigated the damage of one of the costliest floods in U.S. history. And planners say it now holds broader lessons as the growing challenge to plan for the effects of climate change becomes a larger part of commercial development.