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A comment on How French Drains Work. Parent comment
But that got me thinking, how often do they adjust these estimates? Was a "100 year flood" in 1950 less than in 2000, say?
Obviously it'll be different for different areas, especially between countries, but still.
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But that got me thinking, how often do they adjust these estimates? Was a "100 year flood" in 1950 less than in 2000, say?
Obviously it'll be different for different areas, especially between countries, but still.