As flood waters recede from Hurricane Harvey, thousands are set to return to their homes on Sunday to survey damage from unprecedented flooding that devastated densely populated areas of Texas, as worries mount about health risks.

Harvey, which came ashore on August 25 as the most powerful hurricane to hit Texas in 50 years, is expected to be one of the costliest natural disasters in U.S. history, having displaced more than 1 million people and leaving wreckage in an area stretching for more than 300 miles (480 kms) which officials said would take years to repair.

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