• Pounding rains and rapidly rising floodwaters from the most powerful storm to hit the U.S. in a decade have brought Houston, its fourth-largest city, to its knees.

In scenes that evoked Hurricane Katrina in 2005, roadways turned to rivers, and waist-high waters choked off homes and hospitals. Officials begged boat owners to pitch in with an enormous and frantic rescue operation. The toll — at least 10 dead — is almost certain to rise.

This video compares Houston before and after Hurricane Harvey.

Our reporters on the ground are creating a detailed picture of the disaster unfolding across a broad area of Texas in photos, videos and articles. The Times is providing free access.

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