Though the brunt of Hurricane Maria has left Puerto Rico, the island's water worries continue. On Friday afternoon, the National Weather Service reported that the Guajataca Dam in the northwest is "failing" causing flash flooding. Buses were trying to evacuate people from the area "as quickly as they can," the service said.
The Dam failure is causing flooding downstream on the Guajataca River.
A flash flood watch is also in effect for much of the island through Friday evening with continued rainfall.
At least seven rivers in Puerto Rico are still running above "flood stage" (the point at which overflow begins to cause damage from flooding):
As Hurricane Maria passed, the entire main island saw persistent and intense rain that accumulated quickly. Caguas, about an hour inland from San Juan, saw 37.9 inches of rainfall and most of the island got around 20 inches.
LA Times reporter Molly Hennessy-Fiske described the rain in San Juan as "white sheets of rain almost like a snowstorm. It's that in tense and can get sort of white-out effects."
Occasionally heavy rain is expected to continue until Tuesday, according to the NWS.
Over the past 100+ years, Puerto Rico has averaged 10 inches of rain for all of September.