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A one-hundred year flood is calculated to be the maximum level of flood water to be expected in an average one-hundred-year period. Sometimes, a 500-year or 10,000-year flood is also calculated (especially, in low lying countries, such as the Netherlands). The 100-year flood is sometimes referred to as the 1% flood, since there is a 1% chance of it occurring in any year. Based on the expected water level, an expected area of inundation may be mapped out according to elevation above sea level. This area figures very importantly in building permits, environmental regulations, and flood insurance.

The mathematical field of extreme value theory was created to model rare events such as 100-year floods for the purposes of civil engineering.

In 2002 100-year floods caused by over a week of continuous heavy rains ravaged Europe, killing dozens, dispossessing thousands, and causing damages of billions of dollars in Russia, the Czech Republic, Austria, Germany, Romania, Spain, Croatia, Italy, and Bulgaria.

See also: topographic map, extreme weatherExtreme weather is weather phenomena indicative of an unstable climate; that is, weather that is at the extremes of historical patterns, especially severe or unseasonal weather. The combination of extreme weather and high population density has led to dra

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100sCenturies: 1st century 2nd century 3rd century Decades: 50s 60s 70s 80s 90s 100s 110s 120s 130s 140s 150s 100 101 102 103 104 105 106 107 108 109 Events and trends Significant people Trajan, Roman Emperor 100s.	1000sCenturies: 10th century 11th century 12th century Decades: 950s 960s 970s 980s 990s 1000s 1010s 1020s 1030s 1040s 1050s 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 Events Sweyn I of Denmark does several invasions in England. 1001: Stephen I	1000Events World Population 300 million. Gunpowder invented in China. Scandinavia, Iceland and Hungary Christianized. Stephen I becomes King of Hungary. Sancho III of Navarre becomes King Aragon, Navarre, and Castile. Leif Ericson lands in North America, call
100BASE-T100BASE-T is any of several Fast Ethernet 100 Mbit/s CSMA/CD standards for twisted pair cables, including: 100BASE-TX (100 Mbit/s over two-pair Cat5 or better cable), 100BASE-T4 (100 Mbit/s over four-pair Cat3 or better cable, defunct), 100BASE-T2 (100 Mb	100BaseVG100BaseVG is a 100 Mbit/s Ethernet standard specified to run over four pairs of category 3 UTP wires (known as voice grade, hence the "VG"). It is also called 100VG-AnyLAN because it was defined to carry both Ethernet and token ring frame types. 100BaseVG	100Events The Portland Vase is believed to have been made in Alexandria some time between 20 BC and this year. Pliny the Younger advances to consulship. The Temple of the God of Medicine is built in Anguo, China. Lions have become extinct in Europe by this d
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