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Post by Deleted on Feb 20, 2020 11:49:36 GMT
Near my home is a culvert under a dip in the road ... like a U shaped road. In times of heavy rain the storm ditch running through the culvert fills up and the ditch becomes a torrent. There used to be a team of guys visiting this, and many other culverts, and also clearing out the gutters and storm drains on a regular basis. Then economies were made as necessary at the time, and this work along with grass cutting seemed to 'drop off'. Suddenly in periods of heavy rain, the road flooded quite badly in the dip (2012). Since then they now routinely clear the culvert, and the road doesn't flood. Of course, the water is still around, but it rushes off on its way to ... who knows ... perhaps flood somewhere else
There is no doubt dredging will work ... but whether it just moves the problem I don't know.Rog wise words I do think that not one solution is the perfect choice.
Dredging can help, so can upland/farming management practices, so can flood plain management, so can flood alleviation channels, so can etc. etc.
Sometimes there is a need to slow down the water and sometimes a need to speed it up.
Only real way of working out what is best is a comprehensive plan for each water catchment area from high lands to the sea.
That does need the agreement of landowners/planners and other vested interested parties over wide areas + lots of money + lots of maintenance. I'll not hold my breath but I'm glad I live on a boat!
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Post by brummieboy on Feb 20, 2020 12:00:53 GMT
Alongside our Boat Club and car park, there are two tributaries of the River Penk, which are an important outlet for local land drainage. They both run under the canal in culverts. In the late 90's, anew factory was built on the far side of the canal on what was a flood plain, and one of the culverts was 'shepherded' into four foot concrete pipes, which incorporated some 90o elbows before joining into the other culverted flow. In the summer of 1999, after a day of thunderstorms, this culvert overflowed by about 10 ft above normal levels, flooding cars on the car park hallway up the windows, and flooding our clubhouse, which is 3ft higher than the car park by about 6 inches. On a larger scale, the lack of an outlet caused localised flooding to a housing estate that was only rectified after 3 or 4 occurrences by a network of storm drains built over a mile to connect the little rivers avoiding the culverts. A perfect example of the lack of foresight in the planning stages of building.
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Post by Deleted on Feb 20, 2020 12:05:28 GMT
Plus possibly an indicator of a lack of maintenance ie clearing screens.
Relatively small bore pipes while mathematically being able to transfer the water volume effectively are going to block up too fast.
Quite interesting to work out how to deal with the debris. I've seen a belt based conveyor system with buckets which picked up the debris on a continual basis and dumped it into a hopper above water level.
That was on a small scale abstraction point on the Thames. It has since been replaced with another slightly different design.
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Post by bodger on Feb 20, 2020 13:04:18 GMT
is that the best you can do? you were the one making a ludicrous statement and snide comments to support your point of view so "twat" will do very nicely please be so good as to let me know which comments were, in your opinion, snide?
............... and I always say to the missus, twats are useful things. How useful are you?
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Post by bodger on Feb 20, 2020 13:06:17 GMT
clearly you can't distinguish between serious events and annual totals.
................ so sad.
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Post by JohnV on Feb 20, 2020 13:32:04 GMT
clearly you can't distinguish between serious events and annual totals.
................ so sad.
rude twat ..... the highest recorded (a comparatively modern thing that, recording rainfall events) .... was in Preston Lancs. it was 1.3 inches ....... in 5 minutes ...... oh sorry the date 10th August 1893 the highest 60 minute total ...... Maidenhead Berkshire 3.6 inches 12th July 1901 you really should try and get your facts right ................................... so sad
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Post by Deleted on Feb 20, 2020 13:35:48 GMT
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Post by JohnV on Feb 20, 2020 13:41:41 GMT
Interesting to note that the 48h, week and month largest totals are all this century which has only so far lasted about 20 years. Ah but Bodger will probably claim 1 hour ones don't count, just like the annual ones don't count ....... bet he will accept week or months ..... but only because they might agree with him ....... let's sweep all the others under the carpet and ignore them shall we ?
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Post by Deleted on Feb 20, 2020 13:47:46 GMT
I don't know enough about it to brush anything under any carpets just interested to note the recent records.
Not looked it up before but the recent conditions concentrate the mind towards the subject a little bit.
I know it hasn't been that bad but one wonders if this is just a taster.
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Post by JohnV on Feb 20, 2020 13:59:44 GMT
. Not looked it up before but the recent conditions concentrate the mind towards the subject a little bit. the problem with most peoples view about climate is that it's (in terms of the planet) very short term .... they confuse weather with climate to give you an example in December 2015 there was particularly heavy rain total 219mm but in June 1852 there was 277mm It's like the old saying ... there are lies, damned lies and statistics You can twist statistics by careful selection to support a case .... simply by picking out some and ignoring others Are we having slightly more, extreme weather events ? probably ...... are we having more extreme, weather events ? probably not. Are we going to in the future ? I don't know and I don't believe anyone who says they do know They might have a theory and I might agree with it ... but I don't know
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Post by Deleted on Feb 20, 2020 14:15:19 GMT
. Not looked it up before but the recent conditions concentrate the mind towards the subject a little bit. the problem with most peoples view about climate is that it's (in terms of the planet) very short term .... they confuse weather with climate to give you an example in December 2015 there was particularly heavy rain total 219mm but in June 1852 there was 277mm It's like the old saying ... there are lies, damned lies and statistics You can twist statistics by careful selection to support a case .... simply by picking out some and ignoring others Are we having slightly more, extreme weather events ? probably ...... are we having more extreme, weather events ? probably not. Are we going to in the future ? I don't know and I don't believe anyone who says they do know They might have a theory and I might agree with it ... but I don't knowIt's the facebook floods which really concern me. Irrelevant events blown up out of all proportion by idiot zombies. That is definitely scary.
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Post by bodger on Feb 20, 2020 14:23:45 GMT
clearly you can't distinguish between serious events and annual totals.
................ so sad.
rude twat ..... the highest recorded (a comparatively modern thing that, recording rainfall events) .... was in Preston Lancs. it was 1.3 inches ....... in 5 minutes ...... oh sorry the date 10th August 1893 the highest 60 minute total ...... Maidenhead Berkshire 3.6 inches 12th July 1901 you really should try and get your facts right ................................... so sad two events do not make a trend.
I won't call you a twat, because you are a troll and trolls are just stubborn argumentative critters without female attributes.
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Post by TonyDunkley on Feb 20, 2020 14:37:14 GMT
The essential point, . . that some clearly don't want to recognize or acknowledge, is that the freak weather events we're getting more frequently of late are coming hard on the heels of 30 (+) years of the dredging embargo instituted by the EA on all of their rivers, navigable or otherwise, and gleefully supported by BWB and their wretched successors on the river waterways and navigations for which they are responsible.
Clearly, there is no one single remedy for the now all too frequent serious flooding events we're getting, and there is nothing we can do about whatever climate change may be contributing to those occurrences. What can be done, however, is to significantly increase the effectiveness of any existing or planned flood defences by resuming large scale routine targeted (at known shoaling areas) dredging of every UK river, . . with the majority of the effort concentrating on the two major rivers, the Severn and the Trent, which drain such vast areas via their many tributaries.
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Post by naughtyfox on Feb 20, 2020 15:12:41 GMT
is that the best you can do? I have a whole bag of insults for you but I am saving them up for Christmas.
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Post by JohnV on Feb 20, 2020 15:23:18 GMT
rude twat ..... the highest recorded (a comparatively modern thing that, recording rainfall events) .... was in Preston Lancs. it was 1.3 inches ....... in 5 minutes ...... oh sorry the date 10th August 1893 the highest 60 minute total ...... Maidenhead Berkshire 3.6 inches 12th July 1901 you really should try and get your facts right ................................... so sad two events do not make a trend.
I won't call you a twat, because you are a troll and trolls are just stubborn argumentative critters without female attributes.
I gave you a trend ..... the mid 19th century notalotofpeopleknowthat.wordpress.com/2015/07/13/englands-wettest-decade-the-1870s/but then you say annual figures don't count ...... so I then gave you the highest amount in 5 minutes and the highest in an hour and you reckon they don't count either In other words anything that doesn't coincide with your views doesn't count ........ Yeah .... right ...... I don't know what insults Foxy is saving up for you for Christmas ....... but I reckon you probably deserve them
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