[Diggers350] Somerset Levels no dredge toad pontificates from afar - or trust local community?
Ram Selva
seeds at snail.org.uk
Tue Feb 4 21:20:32 GMT 2014
what land rights activists need to pay attention to more is Hinkley
Point and land 'rights' activists who work for nuclear (and other dodgy)
industiry propaganda.
Ram
On 2014-02-04 17:46, Tony Gosling wrote:
> Having spoken to locals I'm quite clear.
> Over decades silt builds up and up and up so trees start growing
> several yards out from the banks - locals have pix
> Volume of water escaping to the sea for the 12 hours every day around
> low tides is up between 3 and 4 times with dredging. much greater
> cross section = much greater water flowing out.
> Nobody seems to have picked up on the glaring fact that the
> Environmnet Agency sluice is CLOSED when it should be open - broken -
> stuck - nobody seems to know.
> Did anybody here have a look at the video I shot?
> Rather too easy to have a Chris Smith style view from afar.
>
> I do wonder what land rghts activists are up to saying anything other
> than
> Let the people who live there, only a few of which are farmers of
> course, manage the levels flood budget however they want.
>
> T
>
>
>
> At 00:13 02/02/2014, david bangs wrote:
>>
>>
>> 
>> I think George M, Simon F, and Rob's contributions have been good and
>> convincing.
>>
>> Just to say...a very large proportion of the Somerset Levels (the
>> southern moors like West Sedgemoor, Kings Sedgemoor, Wet Moor etc; the
>> middle moors, like Westhay and Tealham Moors etc) are SSSIs, and some
>> sites are National Nature Reserves.
>>
>> I'm a long way away, but I don't hear enough defending this statutory
>> national interest compared to wot I hear from reactionary MPs, Owen
>> Paterson, and farmers.
>>
>> There's a good article on the attempts to staunch the steep decline of
>> breeding waders on the Levels in the latest 'British Wildlife'
>> (ironically titled 'Farewell to the Silver Meadows ?' Vol 25, Dec
>> 2013, pages 77 - 84), in which it's made clear that much of the
>> critical wildlife interest has shrunk back to the conservation-owned
>> nature reserves, DESPITE the statutory protection of so much of the
>> wider Levels.
>>
>> Many folk will remember the appalling farmer-conservationist clashes
>> of thirty plus years ago over drainage in the Levels, after which
>> which some amelioration of the worst farmer / drainage board practices
>> was made.
>>
>> It's not just changes in upstream farming that need to take place (as
>> all three above have suggested).
>>
>> I, for one, can't take the prescriptions of angry Levels farmers
>> seriously (dredge and dredge) when its impossible to separate their
>> contributions from the feeling that their own farming practices are
>> damaging and anti-social,
>>
>> Dave Bangs
>>
>>
>> ----- Original Message -----
>> From: <mailto:chapter7 at tlio.org.uk>Simon Fairlie
>> To: <mailto:diggers350 at yahoogroups.com>diggers350 at yahoogroups.com
>> Sent: Saturday, February 01, 2014 5:32 PM
>> Subject: [Diggers350] Fwd: Somerset levels - monks that dug them knew
>> undredged rivers do not drain
>>
>>
>>
>>
>> Begin forwarded message:
>>
>>> From: ReedMace <<mailto:reedmace at ymail.com>reedmace at ymail.com>
>>> Date: 1 February 2014 15:30:30 GMT
>>> To: Simon Fairlie <<mailto:chapter7 at tlio.org.uk>chapter7 at tlio.org.uk>
>>> Subject: Re: Somerset levels - monks that dug them knew undredged
>>> rivers do not drain
>>>
>>> Simon,
>>>
>>> Perhaps you can post it on my behalf.
>>>
>>>
>>> Speaking as a professional hydrologist there are merits on all sides
>>> of the argument. Clearly it is an emotive subject, particularly for
>>> those experiencing the flooding at the moment. However, I'm not sure
>>> emotive language and insults help anyone.
>>>
>>> The main issues are of scale and importance. Although I don't know
>>> the Somerset Levels well, I do know the Fens - a similarly engineered
>>> expanse of very flat drains.
>>>
>>> The Levels are man-made and therefore cannot be directly compared to
>>> natural catchments whereby water flows through the soil structure
>>> towards the lowest point, as they do in the upper catchments.
>>> Likewise the channels have been artificially created/widened. But
>>> because the area is flat, flow occurs, not due to the gradient in the
>>> river bed, but the gradient in the water level. This is how pumping
>>> works - it artificially lowers the water level at one location
>>> creating a surface (or energy) gradient that allows water to move
>>> towards it. A head (difference in water levels) is therefore required
>>> in order for flow to take place between two points.
>>>
>>> In this type of situation, dredging will help a little, but only by
>>> increasing storage - it does not increase the energy gradient. This
>>> is George Monbiot's point. The better solutions by far are to do with
>>> changes in upstream land use, retaining soil on the land and
>>> improving soil structure, as both George and Simon say. Undertaken
>>> over reasonably large areas these activities will retain water longer
>>> in the upper catchment, while it is still widely distributed, rather
>>> than trying to deal with it once it is all concentrated in the water
>>> course. Note that any tree planting undertaken in this regard must
>>> not be done by ploughing perpendicular to the contours (as is
>>> Forestry Commision practice). This will result in the opposite
>>> effect, creating hundreds of additional drainage conduits straight
>>> downhill in the upper catchment that wil significantly increase the
>>> rate of catchment response to rainfall, exacerbating the situation
>>> downstream.
>>>
>>> More drains won't help either because they won't increase the
>>> discharge capacity of the system - only the available storage -
>>> which, as George points out, is minuscule compared to the volume of
>>> flood water. The monks built the drains, not to cope with flooding
>>> from the upper catchment, but to drain the local soils so they could
>>> grow wool and food. It's a bit like saying we need a few extra minis
>>> to evacuate a city. Of course there is always the option of building
>>> vast concrete trapezoidal channels for the water, which is what has
>>> been done in the Fens (and in places like Jeddah and Kuwait City to
>>> cope with the sudden and enormous volumes of desert floods).
>>>
>>> However, the fact that twice the average monthly rainfall has fallen
>>> in the wettest January on record actually also plays a small part in
>>> this. That is a LOT of water. To say the flooding is entirely a
>>> man-made disaster is, I hope, hyperbole (notwithstanding the rather
>>> banal comment that there's been 'no cloudburst or crazy storm'). But
>>> the solutions advocated in the farmer's article, I suggest, really
>>> wouldn't make much difference to the situation at all - the land is
>>> flat (that is, neither uphill nor downhill - no disrespect to Mr
>>> Temperley) and dredging 15 miles won't change that.
>>>
>>> As for the claim that last year saw a once-in-a-lifetime flood, so we
>>> shouldn't have another one the next year, well that's often the way
>>> climate works and statistics don't. And it's no secret that climate
>>> statistics have been being broken on a fairly regular basis over the
>>> last 20 years. Are we experiencing a shift in the climate's
>>> underlying statistical distribution? I am just slightly surprised
>>> no-one has mentioned climate change - warmer, wetter winters are
>>> exactly what have been predicted since I first started working on
>>> climate-change impacts over 25 years ago.
>>>
>>> Rob
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
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