Deluge in Marysville a ‘100-year event’

MARYSVILLE — The unseasonable rainstorm that struck the Marysville area late Sunday was “a 100-­year event,” a city official said. The sudden downpour backed up storm drains, flooding streets, and water rose to two feet deep in some areas.

According to the Marysville Public Works Department, the city received 2.61 inches of rain in the first 65 minutes. At its peak, the storm cell produced rainfall of 2.48 inches per hour. The total from the storm was 3.40 inches.

Public Works Director Kevin Nielsen called the storm “extremely unique.” The rainfall in those two hours was equivalent to a so-called 100-­year event, which is defined by the amount of rain that falls in 24 hours, Nielsen said. A 100-­year event has an estimated 1 percent chance of happening in a given year, or is expected to occur once every 100 years.

A 100-­year rain event for Marysville, as calculated by the state Department of Ecology, would be 3.36 inches — in 24 hours.

The National Weather Service agrees that the Marysville deluge was particularly unique in Western Washington.

“Very few rainfalls during this time of year are above an inch,” said meteorologist Johnny Burg of weather service’s Seattle office. “Usually rainfalls in May are between one-quarter to three-quarters of an inch.”

The storm sewers in Marysville are designed to accommodate a 25­-year, 24-­hour event, which the state estimates would be 2.75 inches of rain in 24 hours.

Evidence suggests that the trend in Western Washington is for more high-­intensity, shorter-duration rains in spring and fall in recent years, Nielsen said.

More in Local News

Woman badly burned in north Everett house fire

Two men escaped unharmed from the burning home on Lombard Avenue.

House passes ban on bump-fire stocks

If the Senate approves, Gov. Jay Inslee is expected to sign it into law.

Man charged with rape, manslaughter of teen dying from overdose

Brian Roberto Varela’s arraignment is scheduled for Monday.

Unitarian Universalist Congregation puts faith to work

Its “religiously liberal” members are open to differing creeds and doctrines.

Aid crews get a dose of digital medicine

iPad app does the math for them so aid crews are free to treat children

Boy, 15, pleads guilty to kicking death of teen in Marysville

Prosecutors are seeking 30 days behind bars, which is the higher end of what’s allowed for minors.

No injuries after fire ravages vacant Marysville house

Firefighters could not prevent flames from causing damage throughout the interior of the home.

Spikes put end to ride from Seattle to Everett in stolen car

Two men were taken into custody at the bottom of Marine View Drive off I-5.

2 arrested after Marysville shooting leaves man brain dead

The victim had shown 1 suspect — a friend — a stack of money he won at the casino, police said.

Most Read