Something to note about 50-yr/100-yr/X-yr flood lines: Those are the levels that floods are projected to reach **at least once** every X years. It is NOT a probability statement in the way that many people take it - it does not mean that floods will hit a given level only once every X years.
I doubt that the civil engineer who corrected my long-held misunderstanding would agree that the lines are arbitrary. The lines aren't re-drawn every year; insurance rates & development plans obviously hinge on longer-term projections. It's a tough decision about when to re-draw, because lots of new development brings more paved & low-perm surfaces and increased runoff, but do you wait until the floods happen or try to forecast what will happen, not just because of one project but the totality of many? In relatively undeveloped areas, developers would cry foul, saying "But that area has never flooded", which is likely a correct statement, and local officials have little other data to go on in making their decisions.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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