It has been a consistent feature of Brexit that its principal cheerleaders appear to have only a dim understanding of what it might realistically entail, and moreover that they appear to assume that firm commitments made in consequence on negotiation with the EU can be lightly cast aside when they are seen to unsettle the preferred narrative of a Brexit crafted on British terms.
Interesting article on the NI Protocol here on the EU Law Analysis blog.
Just a reminder about the ESB’s useful page of hydrometric information here.
As of yesterday morning (23 February 2020), the discharge through Parteen Villa Weir was 659 cubic metres per second [cumec]. That’s the total discharge from the Shannon, covering both what goes through Ardnacrusha and what goes down the original course of the river [which in summer gets 10 cumec].
Of that 659, Ardnacrusha was getting 381 cumec, which means that 278 was going down the river’s original course.
The ESB’s Shannon forecast says
It is expected that a discharge ranging between 315 [cumec] and 370 [cumec] will be necessary at Parteen Weir over the next 5 days based on current weather forecast.
Those figures are well below the current combined discharge of 659 and more rain is expected, so I presume that the forecast refers to discharge down the original course of the river, which is to increase by between 13% and 33%. Water levels below Parteen Villa Weir are already high, though not at 2009 levels, so an investment in wellies might be advisable.
Shannon floods 2009 here.
Here’s an old page of mine about why the Shannon floods. I’ve removed some links that no longer work. The link to the ESB’s infographic does still work.
Posted in Ashore, Drainage, Economic activities, Engineering and construction, Extant waterways, Modern matters, Operations, Shannon, Waterways management
Tagged cumec, ESB, flood, hydrometric, Shannon, water level
… Shinners to the left of them. The local resident Shinners, having done well in a recent election, may end up forming part of a government while, across the water, the British Shinners (formerly known as the Conservative Party) are well ensconced and about to start dispensing benefits to their supporters.
No, no, not those ex-Labour idiots who voted for them: how much did any of those voters contribute to party funds? Very little, I imagine, so they can’t expect to be rewarded with anything other than the drippings from the pan.
One of the things uniting Irish and British Shinners is a devotion to useless vanity projects, usually costing the public purse a fortune in return for little or no benefit. The Irish Shinners have been pushing the Clones Sheugh for years and they also support the Narrow Water Bridge, which would be built in the middle of nowhere and be far less useful than the Newry Bypass. The British Shinners, however, have an even more idiotic bridge in mind, to be built across a munitions dump.
Her Majesty’s Chief Nitwit, the appalling Johnson, has a string of idiotic proposals behind him, some of which even got built. And now he’s at it again, proposing both a railway line and a bridge to distract attention from his cluelessness, ignorance and stupidity. But there is probably more to it than that, as the admirable Richard Murphy points out today. The bridge (and, I suggest, the railway) will benefit the modern courtiers who finance such projects.
Posted in Ashore, Economic activities, Engineering and construction, Extant waterways, Foreign parts, Ireland, Modern matters, Politics, Roads, Sea
Tagged bridge, Clones sheugh, Narrow Water
The Western Mail & South Wales News of 19 April 1929 had an article by M Franklin Thomas about “Ireland’s Big Engineering Scheme”. The article was illustrated with a map and three photographs were reproduced on the newspaper’s “picture page”. It had a couple of interesting points about the headrace and tailrace considered as navigations; I can’t recall seeing these points made elsewhere.
This [headrace] canal is level, but a flow of about 3½ miles per hour will be maintained owing to the water released through the turbines and navigation locks.
I don’t recall seeing a figure for the current. I presume that that is with three turbines running flat out.
There is an interesting account of the laying of the concrete apron that protects the banks against the “wave action set up by navigation, and the flow of the stream, wind, &c”. And the lock was to have an “ingenious arrangement by which the entering streams of water neutralise each other’s effect”.
Mr Thomas says
The tail race is one mile and a half long, cut from the solid blue limestone, and one of the most interesting points was the method adopted to permit barges to ascend the tail race against the enormous scour from the turbine discharges.
A special navigation channel is cut from the locks to a point some 200 yards below the outfall, and the bed of the tail race rises 20ft in the mile and a half, so that the depth of water will be 35ft at the outfall from the turbines and 15ft at the junction with the Shannon.
This will give a cushioning effect, and the rate of flow will be thus reduced to enable barges to navigate upstream. A bend is also provided where the special navigation channel joins the tail race and the rate of flow is estimated to be the same as that of the head race — 1.5 metres per second, or about 3½ miles per hour.
I would be glad to hear from anyone who can cast further light on this, and especially on whether the rising bed does have the intended effect.
Posted in Ashore, Built heritage, Canals, Economic activities, Engineering and construction, Extant waterways, Historical matters, Industrial heritage, Ireland, Modern matters, Operations, Shannon, waterways, Waterways management
Tagged Ardnacrusha, current, headrace, locks, tailrace
I want to see these 16 pinch points dealt with because in removing them we will drop the levels of the Shannon downstream of Athlone right down to where Deputy Harty lives. We are talking about dropping the level of the Shannon a foot and a half. The number of people who would benefit from this – the local farmer, the local business, BirdWatch Ireland – is enormous. The Government is committed to putting huge money into this.
Kevin Moran TD (Ind, Longford-Westmeath), minister for draining the Shannon, in a Dáil Topical Issue Debate on Flood Risk Management on 16 October 2019.
I wonder which level he’s talking about.
Posted in Drainage, Economic activities, Engineering and construction, Extant waterways, Ireland, Modern matters, Operations, People, Politics, Shannon
Tagged drain, flood, Shannon
Big it up, says Sarah Carey in the Indo.
Posted in Built heritage, Canals, Economic activities, Engineering and construction, Extant waterways, Ireland, Modern matters, Operations, People, Restoration and rebuilding, Scenery, waterways, Waterways management
Tagged greenway, Royal Canal
In the minor arrangements made by us, and the rates fixed for small boats, we have been influenced by the same general principles already mentioned, and have been guided by the further principle of making every class of traffic or boat, however small, liable to some rate of toll, in order to establish a useful and beneficial control over the navigation.
Second Report of the Commissioners for improving the Navigation of the Shannon; with an appendix Ordered, by The House of Commons, to be Printed, 26 February 1841 
Posted in Economic activities, Extant waterways, Historical matters, Ireland, Irish inland waterways vessels, Modern matters, Operations, Shannon, Sources, waterways, Waterways management
Tagged control, Shannon, tolls
According to the Indo, which may or may not know anything about the matter itself but probably got a press release from someone [to whom the same qualification may apply], farmers along the Shannon Callows are concerned about rising water levels at Clonown, an area on the west bank below Athlone.
The level in that area is held up by the weir at Meelick. But according to Waterways Ireland today,
[…] low water levels exist on the upstream approaches to Meelick and Victoria Lock. Water levels are currently below Summer levels.
According to the OPW gauges at Athlone, the water level is below the 50th percentile and is falling. The same applies at Banagher, although it did exceed the 50th percentile for some days.
Three lessons suggest themselves:
- farmers might need to get used to the idea that, when it rains, it gets wet — and that, if they choose to farm on a floodplain, their land might get wet too
- politicians might refrain from issuing nonsensical panic-laden press releases to gain free publicity [but I suppose that’s too much to ask for]
- journalists might like to check stuff for themselves instead of reprinting press releases unquestioningly [but that too is probably too much to ask for].
Posted in Ashore, Drainage, Economic activities, Engineering and construction, Extant waterways, Historical matters, Ireland, Modern matters, Operations, Shannon, Sources, waterways, Waterways management, Weather
Tagged flood, Shannon