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Post by Deleted on Jul 29, 2022 20:13:21 GMT
Lack of waterΒ π€ Bit of a buggeration ...Β means we'll have to race a bit to get beyond Hillmorton. The hire firms, and live aboard experience boats must be grinding their teeth, poor sods. Rog Hope you noticed I got it right this time quaysider
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Post by Mr Stabby on Jul 29, 2022 20:22:43 GMT
One of the reasons that I accelerated my return to the farm was because I anticipated this. CRT have been pumping water up from the River Swift into the North Oxford and then up to the Coventry Canal but the River Swift has now run dry. Water here is about 8-10 inches down compared to normal.
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Post by Deleted on Jul 29, 2022 20:31:18 GMT
One of the reasons that I accelerated my return to the farm was because I anticipated this. CRT have been pumping water up from the River Swift into the North Oxford and then up to the Coventry Canal but the River Swift has now run dry. Water here is about 8-10 inches down compared to normal. Same here. Levels were very low on the Coventry weeks ago when we came back from Wales. All fine here on the Grand Union near Northampton. I wonder how low levels got in 1976 during the big drought?
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Post by Deleted on Jul 30, 2022 7:20:59 GMT
Poetic irony that the day after the closure notice is posted, we are forecast three days of rain π
Rog
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Post by Tony Dunkley on Jul 30, 2022 8:41:24 GMT
One of the reasons that I accelerated my return to the farm was because I anticipated this. CRT have been pumping water up from the River Swift into the North Oxford and then up to the Coventry Canal but the River Swift has now run dry. Water here is about 8-10 inches down compared to normal. I wonder how low levels got in 1976 during the big drought? River levels, and canalised river levels, suffered badly that year, . . canal levels were NOT affected at all. Rainfall affects and controls river levels directly, . . whereas the navigation authority has complete control over canal pound levels, independently of rainfall, by regulating the flow along the feeders from reservoirs. Attributing or linking low water levels in canal pounds to low rainfall is utter nonsense, . . and allowing pound levels to drop below normal weir level in hot dry weather is not only bad practice, but is also very damaging to canal banks and the puddle lining.
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Post by Mr Stabby on Jul 30, 2022 8:52:51 GMT
I wonder how low levels got in 1976 during the big drought? River levels, and canalised river levels, suffered badly, . . canal levels didn't. Rainfall affects and controls river levels directly, . . whereas the navigation authority has complete control over canal pound levels, independently of rainfall, by regulating the flow along the feeders from reservoirs. Attributing or linking low water levels in canal pounds to low rainfall is utter nonsense. Yes, but rather amazingly if there is a prolonged period without rainfall the reservoirs start to run low as do the rivers from which water is sometimes extracted. No matter how much one has an irrational hatred of CRT, the water outside my boat window is destined to end up eventually in the sea. It's called "gravity" Tony.
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Post by Telemachus on Jul 30, 2022 8:54:43 GMT
I wonder how low levels got in 1976 during the big drought? River levels, and canalised river levels, suffered badly that year, . . canal levels were NOT affected at all. Rainfall affects and controls river levels directly, . . whereas the navigation authority has complete control over canal pound levels, independently of rainfall, by regulating the flow along the feeders from reservoirs. Attributing or linking low water levels in canal pounds to low rainfall is utter nonsense. Prolonged low rainfall means the reservoirs get very low and eventually run out of water. In 1976 the usage of the canals (locks) was massively less than it is today and people were less stupid, so less likely to leave paddles open at both ends etc.
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Post by Telemachus on Jul 30, 2022 8:55:33 GMT
River levels, and canalised river levels, suffered badly, . . canal levels didn't. Rainfall affects and controls river levels directly, . . whereas the navigation authority has complete control over canal pound levels, independently of rainfall, by regulating the flow along the feeders from reservoirs. Attributing or linking low water levels in canal pounds to low rainfall is utter nonsense. Yes, but rather amazingly if there is a prolonged period without rainfall the reservoirs start to run low as do the rivers from which water is sometimes extracted. No matter how much one has an irrational hatred of CRT, the water outside my boat window is destined to end up eventually in the sea. It's called "gravity" Tony. And yet some of it ends up in the sky. Do we have negative gravity?
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Post by Mr Stabby on Jul 30, 2022 8:58:18 GMT
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Post by naughtyfox on Jul 30, 2022 9:14:05 GMT
Yes, but rather amazingly if there is a prolonged period without rainfall the reservoirs start to run low as do the rivers from which water is sometimes extracted. No matter how much one has an irrational hatred of CRT, the water outside my boat window is destined to end up eventually in the sea. It's called "gravity" Tony. And yet some of it ends up in the sky. Do we have negative gravity? If you drop a hammer down a coal mine shaft in England it heads directly for the sky above Australia. Spooky.
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Post by ianali on Jul 30, 2022 9:28:55 GMT
Lack of waterΒ π€ Bit of a buggeration ...Β means we'll have to race a bit to get beyond Hillmorton. The hire firms, and live aboard experience boats must be grinding their teeth, poor sods. Rog Hope you noticed I got it right this time quaysider Are you sure they are closing these? I can only see restrictions on opening times.
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Post by Telemachus on Jul 30, 2022 9:32:21 GMT
Lack of water π€ Bit of a buggeration ... means we'll have to race a bit to get beyond Hillmorton. The hire firms, and live aboard experience boats must be grinding their teeth, poor sods. Rog Hope you noticed I got it right this time quaysider Are you sure they are closing these? I can only see restrictions on opening times. As you say, itβs just overnight closing, not complete closing.
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Post by Tony Dunkley on Jul 30, 2022 10:11:47 GMT
River levels, and canalised river levels, suffered badly that year, . . canal levels were NOT affected at all. Rainfall affects and controls river levels directly, . . whereas the navigation authority has complete control over canal pound levels, independently of rainfall, by regulating the flow along the feeders from reservoirs. Attributing or linking low water levels in canal pounds to low rainfall is utter nonsense. Prolonged low rainfall means the reservoirs get very low and eventually run out of water. In 1976 the usage of the canals (locks) was massively less than it is today and people were less stupid, so less likely to leave paddles open at both ends etc. That's so, . . but the old/good/correct practice of maintaining canal pound water levels just 'on weir' is not directly related to or the same thing as conserving water supplies by restricting, supervising, or preventing the use of locks, . . and taking steps to minimise leakage. Until such time as no more water can be drawn off canal reservoirs it's essential that pounds are kept up to normal retention levels -- ie. almost full enough to be 'running weir', but not quite. The benefits of this are twofold. Firstly, canal banks and the puddle lining are prevented from drying out and cracking, leading to increased leakage and loss of water, and secondly, . . the fact that the rate of evaporation loss from canal pounds is less than the rate of evaporation loss from reservoirs. Canal pounds are generally shaded from sunlight, and to some extent wind, along some of their length, . . whereas reservoirs don't have anything like the same proportion of the water surface shaded, or anything much in the way of shelter from wind -- which evaporates off water more quickly than sunlight alone. Keeping water in reservoirs, if and when it's still available from them, instead of using it to keep pounds full is the height of stupidity and incompetence. It isn't that C&RT haven't got enough water to keep canal pounds full, . . it's that they're keeping it in the wrong place -- in the reservoirs instead of in the canals themselves.
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Post by Deleted on Jul 30, 2022 10:31:51 GMT
Interesting point that, but isn't most drinking water also stored in large reservoirs. One would think drinking water was more important than canal water.
As I understand it, the jet steam is a huge influence behhind our weather system and can sometimes move evaporated water (clouds) away from where we might need it.
The sun acts as a natural water pump by evaporating the water upwards so that it can fall again on high land and run down. In fact everything on this planet is directly or indirectly powered by the sun...including us..
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Post by Mr Stabby on Jul 30, 2022 10:47:55 GMT
Interesting point that, but isn't most drinking water also stored in large reservoirs. One would think drinking water was more important than canal water. Tony Dunkley doesn't "do" thinking.
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