Muddy water surrounding homes and businesses in Baton
Rouge, in a photograph from the United States Coast Guard.
People use boats to access a neighborhood after flooding August 16, 2016 in Gonzales, Louisiana. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images NYTCREDIT: Brendan Smialowski/Agence France-Presse -- Getty Images

People use boats to access a neighborhood after flooding August 16, 2016 in Gonzales, Louisiana.

Danielle Blount kisses her 3-month-old baby Ember as she feeds her while they wait to be evacuated by members of the Louisiana Army National Guard near Walker, La., after heavy rains inundating the region, Sunday, Aug. 14, 2016. (AP Photo/Max Becherer) NYTCREDIT: Max Becherer/FR 171354AP, via Associated Press

Danielle Blount kisses her 3-month-old baby Ember as she feeds her while they wait to be evacuated by members of the Louisiana Army National Guard near Walker, La., after heavy rains inundating the region, Sunday, Aug. 14, 2016.

Floodwaters reach the front steps of a home near Holden, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far. (AP Photo/Max Becherer) NYTCREDIT: Max Becherer/FR 171354AP, via Associated Press

Floodwaters reach the front steps of a home near Holden, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far.

In this aerial photo, rescue officials and civilians alike work to pull people from their flooded homes along the flooded Tangipahoa River near Amite, Independence, Tickfaw and Robert, Louisiana Saturday, Aug. 13, 2016. (Ted Jackson/Nola.com | The Times-Picayune) NYTCREDIT: Ted Jackson/NOLA.com The Times-Picayune, via Associated Press

In this aerial photo, rescue officials and civilians alike work to pull people from their flooded homes along the flooded Tangipahoa River near Amite, Independence, Tickfaw and Robert, Louisiana Saturday, Aug. 13, 2016.

In this aerial photo, rescue officials and civilians alike work to pull people from their flooded homes along the flooded Tangipahoa River near Amite, Independence, Tickfaw and Robert, Louisiana Saturday, August 13, 2016. (Ted Jackson/Nola.com | The Times-Picayune) NYTCREDIT: Ted Jackson/NOLA.com The Times-Picayune, via Associated Press

In this aerial photo, rescue officials and civilians alike work to pull people from their flooded homes along the flooded Tangipahoa River near Amite, Independence, Tickfaw and Robert, Louisiana Saturday, August 13, 2016.

People wade in water near flood damaged homes in Highland Ridge Subdivision in Youngsville, La., Sunday, Aug. 14, 2016. Torrential rains swamped parts of southern Louisiana, causing widespread flooding. (Scott Clause/The Daily Advertiser via AP) NYTCREDIT: Scott Clause/The Daily Advertiser, via Associated Press

People wade in water near flood damaged homes in Highland Ridge Subdivision in Youngsville, La., Sunday, Aug. 14, 2016. Torrential rains swamped parts of southern Louisiana, causing widespread flooding.

This aerial image shows flooded areas in Denhamp Springs, La., Saturday, Aug. 13, 2016. Louisiana Gov. John Bel Edwards says more than 1,000 people in south Louisiana have been rescued from homes, vehicles and even clinging to trees as a slow-moving storm hammers the state with flooding. (Patrick Dennis/The Advocate via AP) NYTCREDIT: Patrick Dennis/The Advocate, via Associated Press

This aerial image shows flooded areas in Denhamp Springs, La., Saturday, Aug. 13, 2016. Louisiana Gov. John Bel Edwards says more than 1,000 people in south Louisiana have been rescued from homes, vehicles and even clinging to trees as a slow-moving storm hammers the state with flooding.

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A man navigates a boat of rescued goats past a partially submerged car after flooding on August 16, 2016 in Gonzales, Louisiana. As many as 20,000 people have been rescued following unprecedented floods in the southern US state of Louisiana, including a 78-year-old woman who spent a night stranded in a tree, police said late Monday. Residents awoke Tuesday to find their homes and businesses still surrounded by muddy water, without clear answers about when the epic flooding that has killed at least seven is expected to recede. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images NYTCREDIT: Brendan Smialowski/Agence France-Presse -- Getty Images

A man navigates a boat of rescued goats past a partially submerged car after flooding on August 16, 2016 in Gonzales, Louisiana.
As many as 20,000 people have been rescued following unprecedented floods in the southern US state of Louisiana, including a 78-year-old woman who spent a night stranded in a tree, police said late Monday. Residents awoke Tuesday to find their homes and businesses still surrounded by muddy water, without clear answers about when the epic flooding that has killed at least seven is expected to recede.

A woman opens a gate at a family member's home after flooding on August 16, 2016 in Gonzales, Louisiana. As many as 30,000 people have been rescued following unprecedented floods in the southern US state of Louisiana, including a 78-year-old woman who spent a night stranded in a tree, police said late Monday. Residents awoke Tuesday to find their homes and businesses still surrounded by muddy water, without clear answers about when the epic flooding that has killed at least seven is expected to recede. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images NYTCREDIT: Brendan Smialowski/Agence France-Presse -- Getty Images

A woman opens a gate at a family member’s home after flooding on August 16, 2016 in Gonzales, Louisiana.
As many as 30,000 people have been rescued following unprecedented floods in the southern US state of Louisiana, including a 78-year-old woman who spent a night stranded in a tree, police said late Monday. Residents awoke Tuesday to find their homes and businesses still surrounded by muddy water, without clear answers about when the epic flooding that has killed at least seven is expected to recede.