An already-swollen reservoir west of downtown Houston overtopped its spillway Tuesday, sending an "uncontrolled release" of Harvey's floodwaters into nearby neighborhoods, as a separate levee breach south of the city prompted an urgent warning for residents to leave immediately. "This is not going to happen fast, this is a slow rise," Lindner told reporters, adding the flow of water going over the reservoir into neighborhoods will increase as the levels in the reservoir behind continue to rise. Related Image Expand / Collapse"Once the water comes into the street you aren't going to be able to leave," Lindner said. Lindner said this does not mean that downtown Houston will necessarily be greatly impacted, but officials don't fully know what will happen because they've never faced this situation before. In Houston's southwestern suburbs, officials in Fort Bend County, Texas, warned Tuesday the Brazos River is projected to crest at 59 feet, FOX 26 Houston reported.

Source: Fox News August 29, 2017 11:34 UTC