What geography is used in determining rainfall frequencies such as a 100 year event?

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Houston and Mumbai are both currently suffering from 500/1000 year flood events. In recent years North Houston and South West Houston separately (roughly 30 miles apart) have both suffered from 100 year events. Since the people just conflate Cypress and Richmond/Rosenberg to Houston there is much ridiculing of the idea they were "100 year events" because "Houston" has had 4-5 100 year events in the last 5 years. I personally am not confused by the statistical nature of the estimates, so my question is,

What is the definition of Area in the following statement?

This Area has a 1% chance of seeing a rainfall event of 4 inches/hour in any given year.

Houston Metro? Gulf Coast? Texas? etc?

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Posted: 7 years ago
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