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RAPID CITY, S.D. (AP) — A Rapid City official says a recent downpour that washed away vehicles and flooded structures was a 100-year event.

The Rapid City Journal reports the Friday storm occurred just days after officials showed off a large new stormwater detention cell in Robbinsdale Park. Dale Tech, Rapid City director of public works, says there were informal reports of 3 to 4 inches in some Robbinsdale area rain gauges, with lesser but still significant amounts measured elsewhere in Rapid City.

Tech described the rain as so heavy the chance of it occurring in a year is 1 percent. He says the new stormwater cell worked as planned and protected areas downstream.

Lt. Jim Bussell of the Rapid City Fire Department says the agency responded to 21 calls for service Friday between 6 p.m. and 10 p.m.

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Information from: Rapid City Journal, http://www.rapidcityjournal.com