Damian, I am not sure exactly what you are trying to say in your post. Firstly, these poor people WERE told that the terrible flooding of 2009 was a 'Once in a hundred years event'. Now obviously, that doesn't mean that the next such event will come exactly one hundred years to the day from that first....but surely you are not trying to claim that SIX years is an acceptable fraction of the one hundred years statement of expectation?
Secondly, we are constantly being told that global warming, or any of the pseudonyms that fact now goes under, is causing massive changes, increasingly unpredictable world weather events etc. On a regular basis we are seeing horrific footage of floods, earth slides, droughts, unprecedented storms....you name it, the world is seeing record breaking levels of it. This, and the unpredictable nature of it, the increasing frequency of it, is a constant source of dismay and discussion on TV and radio news channels and dedicated documentaries. And that all started happening at least fifteen years ago.
So, bearing that in mind, I don't think I am wrong or out of order when I suggest that the new flood defenses WERE a shining example of "poor planning and consequent design" as you put it. You say "The level of rainfall that fell was obviously something that was not predicted because it was something seemingly impossible to predict using models based on past events given records going back 220 odd years."
Well, yes, we know that...but as I say, we have been warned for many years that the world weather patterns are changing, getting far worse, less predictable, to expect them to steadily get worse....and so on, so what the hell is the point of "Using models based on past events given records going back 220 odd years?" I think that could reasonably be labeled as 'poor planning', don't you? If I were a grumpy old curmudgeon, I might even go as far as labeling it criminally incompetent!
Finally, your last sentence reads "The defences that were built were astonishing in their effectiveness at preventing something quite beyond what I witnessed on Sunday, and for that, I think you will find that most, in Keswick anyway, will agree." Again, you leave me speechless...(A) because I am not 100% certain what that actually means in English. But, either way, (B) Keswick was flooded! I think actually, this particular resident of Keswick would rather agree with me, and I quote....
Keswick resident Rich Gale, who experienced previous floods in 2005 and 2009, said he had felt "reasonably safe" since the Environment Agency extended the town's flood defence wall and he added protection to his own home.
But he said: "We stayed in our house because after the 2009 flood we bought flood defences for our home so we thought we'd better stay in and try and mop up any leaks that come in, but we just got overwhelmed and we ended up leaving our house."
Hmmmm. It seems from that quote that not only were the new defenses inadequate, but the combination of those and his own newly installed house defenses couldn't cope. They may in Keswick have alleviated the severity of the flood somewhat, but many houses were still inundated there, and elsewhere in the area it was plain from the TV newscasts that the extent of it was horrific. There is not a lot of point in telling someone who's house is under two or three feet of water that 'It would have been a lot worse but for the new defenses!'
Cheers, Dave.