What are the ongoing threats to health, safety and shelter after Harvey?

Photo: Raeann Barber, 36, formerly of the 9th Ward in New Orleans and now of Southeast Houston, sits on a cot in the George R. Brown Convention Center after her home was flooded in Houston, Texas, U.S. August 29, 2017. Picture taken August 29, 2017. (Brian Thevenot/Reuters)