There's been a lot of information from the US government about the floods that have afflicted Houston. To give you a sense of proportion -- the weight of the water in Houston, lower land levels by 2cm...so it was a lot of water.
The 100 and 500 benchmarks are used to illustrate a point that in any one year there is a 1% and a 0.2% probability that there will be a certain specified flooding level. It doesn't mean that it will not happen every other year (which is the case now).
The model making these prediction makes no assumption about how often this will happen, but how often in a year this will happen (1% chance). Of course all this stuff is based on assumption -- that can be wrong.
If the weather patterns change -- then the assumptions on the amount of rain by each storm has to be revised. The problem is that the "right" has been using these 100 years and 500 years as a reason to do nothing -- while at the same time stoping any analysis as to climate change.
Ignorant hypocrite using data incorrectly
The 100 and 500 benchmarks are used to illustrate a point that in any one year there is a 1% and a 0.2% probability that there will be a certain specified flooding level. It doesn't mean that it will not happen every other year (which is the case now).
The model making these prediction makes no assumption about how often this will happen, but how often in a year this will happen (1% chance). Of course all this stuff is based on assumption -- that can be wrong.
If the weather patterns change -- then the assumptions on the amount of rain by each storm has to be revised. The problem is that the "right" has been using these 100 years and 500 years as a reason to do nothing -- while at the same time stoping any analysis as to climate change.
Ignorant hypocrite using data incorrectly
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