500-year

The levees were built in the 1940s and 1950s by the U.S. Army Corps of Engineers and were designed to withstand a so-called 500-year flood.

Illinois Region Gets Reprieve From Flood Insurance Joe Barrett 2011

The citywide buyout plan is designed to protect Fargo in the event of a so-called 500-year flood, which would require the removal of at least 800 homes.

Yahoo! News: Business - Opinion 2011

The citywide buyout plan is designed to protect Fargo in the event of a so-called 500-year flood, which would require the removal of at least 800 homes.

The Seattle Times 2011

The citywide buyout plan is designed to protect Fargo in the event of a so-called 500-year flood, which would require the removal of at least 800 homes.

Kansas City Star: Front Page 2011

The citywide buyout plan is designed to protect Fargo in the event of a so-called 500-year flood, which would require the removal of at least 800 homes.

Kansas City Star: Front Page 2011

The Village of Gays Mills, Wis. decided to move its most vulnerable buildings to higher ground after back-to-back 500-year floods in 2007 and 2008.

William S. Becker: Can We Handle Nature's New Norm? (Part 3) William S. Becker 2011

The Village of Gays Mills, Wis. decided to move its most vulnerable buildings to higher ground after back-to-back 500-year floods in 2007 and 2008.

William S. Becker: Can We Handle Nature's New Norm? (Part 3) William S. Becker 2011

It's had a great 500-year run ... but it's time to change. at

Archive 2009-08-01 2009

But the probability distribution function does not need to shift very far for the 100-year event to be occurring several times a century, along with a good chance of at least one 500-year event.

Hansen projects hottest year on record... in 2012 Andrew Freedman 2010

Under Plan H, all but about 20 would be raised to protect against a 500-year flood — a flood so severe it would be expected to occur once every half-millennium.

Mo. opposes river-taming effort 2011