Tag Archives: floods

Draining Lough Derg

The ESB is currently letting more water down the old course of the Shannon, from Parteen Villa Weir through O’Briensbridge, Castleconnell and the Falls of Doonass. This channel gets the first 10 cubic metres per second from the Shannon; the next 400 go through Ardnacrusha and anything left over is sent down the old course.

The result is to help to reduce the water level on Lough Derg while raising it on the old course.

The footbridge in Castleconnell at normal summer level in 2002

The footbridge in Castleconnell at normal summer level in 2002

The footbridge on 1 January 2014

The footbridge on 1 January 2014

Before Ardnacrusha was built, the old channel took the entire flow of the Shannon, so it can take more than it has now.

The footbridge in the floods of November 2009

The footbridge in the floods of November 2009

The level is still below that of 2009, when the land around the old channel flooded in several places. But much land is waterlogged: I saw yesterday that the upper reaches of the Nore, the Barrow and other rivers were in flood. And more rain is forecast.

Wouldn’t it be nice if some of that could be sent to Dublin instead? I see that some folk claim (on what looks like a website that hasn’t been updated for a while) that the evil Dublin folk want to extract 350 million litres of water from the Shannon every day; the original idea was to take it from Lough Ree but now it seems that Lough Derg is the preferred source.

Now 350 million litres sounds like a lot, but it’s 350 000 cubic metres per day, 14 583.3 per hour, 243.05 per minute, 4.05 per second, which is less than 1% of normal flow through the two channels draining Lough Derg. There’s a lot more at the moment, and the good citizens of Dublin are welcome to come down and fill their buckets. I suspect that Clare TD Michael McNamara has got things out of proportion.

Addendum: 350 million litres per day, over a lake whose area is 130 square kilometres, would lower the level of the lake (if my calculations are correct) by 2.69 millimetres. If no water entered the lake, the level would be down 983 mm after a year, ignoring evaporation and other abstractions and assuming that the Shannon and other tributaries no longer flowed in and that there was no rain.

Levels

On 9 October 2013 minister Brian Hayes spoke in the Dáil about Shannon water levels, saying:

A meeting between the ESB, Waterways Ireland and the Office of Public Works to review the interim operating regime is due to take place shortly.

On 17 and 18 October 2013, in correspondence with Waterways Ireland, I learned that the meeting had not then taken place and that no date had been set. I have now sent WI another note asking whether the meeting has been held and, if it has, requesting a report on the proceedings and outcome.

In the meantime, I have put together two charts nicked from waterlevel.ie for Banagher and Athlone:

Athlone and Banagher water levels

Athlone and Banagher water levels

Both of them show the levels for the last 35 days. I’m sure that more data and much more sophisticated analysis would be required to reach any reliable conclusion, but my untutored impression is that, in what has been a fairly dry autumn, keeping Lough Ree low didn’t do much to keep Banagher low. If that is so, and if I’m right in thinking that this autumn was dry (see below), the outcome would not show whether lowering Lough Ree would help in a very wet season; it may be necessary to repeat the experiment next year while performing rain dances. I would be glad, though, to have comments from more erudite folk and, if I get any information from TPTB, I’ll publish it here. In the meantime, this CFRAM PDF provides background reading.

On the dryness: Met Éireann’s monthly report for September 2013 is headed “Dry everywhere; warm and dull in most places” while that for October says “Rainfall was above average except in parts of the West, Northwest and North”. Its report doesn’t, AFAIK, specify any stations in the Shannon catchment (apart from Shannon Airport), but those to the west were generally below average while whose to the east were above; it may be that the Shannon rainfall was moderate.

Like the Mary Ellen Carter …

rise againJust a few weeks ago the depth was around 1.7m at Athlone weir, about 7″ above the navigational minimum. But today the depth is over 2.4m and, with staff gauge zero at 35.360m above Poolbeg datum, the water level is 37.760 m above Poolbeg datum.

Ardnacrusha

A press release just in from Waterways Ireland:

Waterways Ireland Change Advice on Travel into Limerick

Waterways Ireland is changing the advice on travel from Ardnascrusha into the Limerick Navigation due to a new service available from the ESB which provides real time information on the output from the turbines.

Boaters are advised not to travel on the Ardnacrusha to Limerick Navigation if the output from Ardnacrusha is above 20 Megawatts. The previous advice advised boaters not to travel if one turbine was operating; 1 turbine is equivalent to 20 megawatts.

The new service offers real time information on the megawatt output of Ardnacrusha by phone (tel 087-6477229) and is available 24hrs a day. Boaters are advised to contact the ESB phoneline for information on the output when making travel plans. In the event of a line failure in the real time information number, boaters can call the main Ardnacrusha number 087-9970131 for the megawatt information as well as any other information required for travel through Ardnacrusha.

This new information service is an improvement in safety for mariners who travel on the Ardnacrusha to Limerick Navigation.

Update 2018: that was in 2013. Much better information is now available here.

WI’s budget: the minister speaks

I wrote here about the implications of the RoI 2014 budget for Waterways Ireland. The minister, Jimmy Deenihan [FG, Kerry North/West Limerick], spoke about it in the Dáil on Wednesday 16 October 2013 [h/t KildareStreet.com]. At the end of his lengthy contribution he said:

I am committed to developing North-South co-operation within the broader arts, heritage and commemorative activities of the Department as well as through the funding of North-South bodies. A provision of €38.3 million will be made available to support the two North-South implementation bodies, An Foras Teanga, comprising Foras na Gaeilge and the Ulster-Scots Agency, and Waterways Ireland. The provision will enable Waterways Ireland to deliver on its core activities and targets, which include keeping the waterways open for navigation during the main boating season and promoting increased use of the waterways resource for recreational purposes. This expenditure should also assist in developing and promoting the waterways, attracting increased numbers of overseas visitors and stimulating business and regeneration in these areas. Capital funding of almost €4 million will be made available to Waterways Ireland to facilitate the ongoing maintenance and restoration of Ireland’s inland waterways, thereby increasing recreational access along the routes of waterways.

The Government has reaffirmed its commitment to continuing to make progress, to improving the economy, to exiting the bailout, and to helping to create jobs. The Department and the sectors it represents will make a significant contribution to this work over the course of 2014.

I pointed out last year that Waterways Ireland is part of northsouthery and that, at budget time, we don’t get a breakdown of the northsouthery budget between An Foras Teanga and Waterways Ireland. In 2011, WI got roughly 60%, but I don’t know what happened after that. Here’s what I thought was happening last year:

Current spending (WI)

2010 Estimates: €25 585 000
2011 Estimates: € 24 335 000
2012 Estimates: €22 929 600 (60% of €38 216 000)

Capital spending (WI)

2008 Estimates: €11 000 000
2009 Estimates: €10 300 000
2010 Estimates: €8 000 000
2011 Estimates: €6 000 000 (or €6 002 000)
2012 Estimates: €4 500 000 (or €4 502 000) (100%)

In his speech, above, the minister said that northsouthery is going to get €38.3 million and that Waterways Ireland is to get capital funding of €4 million. However, the €4 million is included in the €38.3 million. The expenditure report [PDF; see page 160] gives these details:

  • for 2013 northsouthery had €36 210 000 of current spending; for 2014 it will get €34 425 ooo
  • for 2013 northsouthery had €4 080 000 of capital spending (all, or almost all, of which was for Waterways Ireland}; for 2014 it will get €3 958 000
  • the overall budget for northsouthery is down 5%.

We can calculate that the capital budget is down about 3%; the much larger current budget is down 5%. If WI gets 60% of the total, its current expenditure contribution from RoI will be €20 655 000, down over €2 000 000 from the previous year and about €5 000 000 since 2010, and its total current expenditure (85% RoI, 15% NI) will be €24 300 000.

The other interesting part of the minister’s speech is what WI is expected to do:

  • promoting increased use of the waterways resource for recreational purposes
  • developing and promoting the waterways
  • attracting increased numbers of overseas visitors
  • stimulating business and regeneration in these areas
  • increasing recreational access along the routes of waterways.

That should keep them busy. But I omitted one activity:

  • keeping the waterways open for navigation during the main boating season.

Emphasis mine, but does this mean that winter boating (at least if it involves staff time, eg at locks) will become a thing of the past?

 

Up with this sort of thing

Folk interested in the history of the Shannon before 1850 may like to know of a talk …

The smart green technology of the 1830s: the Shannon steamers and the definition of Ireland

… to be delivered to the Thomond Archaeological and Historical Society on Monday 4 November 2013. It’s in Room T.1.17, TARA Building, Mary Immaculate College, Limerick, at 8pm.

A related topic …

Charles Wye Williams and the Anglo-Irish Trade

… will be discussed in one of the papers at the Eighth [British] Waterways History Conference on Saturday 26 October 2013 at the University of Birmingham. Leave a Comment below if you would like contact information for the conference.

Water levels in Athlone

At time of writing, the depth of water at Athlone Weir is 1.7m. “Staff gauge zero is 35.360m above Poolbeg datum”, which means the water level is 37.06m OD (Poolbeg). According to Bob Cullen’s 2002 article for Inland Waterways News [PDF], “The minimum navigation level in Lough Ree is 36.88m OD”, so if the level drops another 0.18m, about 7 inches, there may be a WI Marine Notice.

It seems that the dropping of the level of Lough Ree is intended to provide a buffer against flooding in the area from Athlone downstream to Meelick. According to Brian Hayes “A meeting between the ESB, Waterways Ireland and the Office of Public Works to review the interim operating regime is due to take place shortly.” [I have asked Waterways Ireland for a report on the meeting.]

But, if we are to believe the Dublin Evening Mail, the Shannon Commissioners took a rather more robust attitude to flooding downstream of Athlone: steamers [and PR] came first.

Water levels

Waterways Ireland is warning of low water levels on Lough Ree. You can see here how the level at Athlone Weir has changed over the past 35 days.

After the summer

I don’t really know much about politicians, local or national, but I presume that, in the summer recess, they retire to their country estates for a bit of huntin, shootin and fishin, with breaks for trips to agreeable parts of foreignlandia (Tuscany, perhaps) and with occasional visits from other gentlefolk.

At any rate, something distracts them and keeps them quiet, but summer is now giving way to autumn and, er, innovative suggestions are coming thick and fast from politicos anxious to get other people to contribute to social and economic development in their constituencies (or to get reelected, whichever comes first).

So we have one who wants a walkway across Meelick Weir and another who wants a riverbus service on the Park Canal in Limerick.

Meelick turns up in another story from the past week, by John Mulligan in the Irish Independent. But despite the silly headline and subhead, the body of the article is a thorough and balanced account of flooding on the Shannon. Mr Mulligan is to be commended.

 

 

Two brief notes about eels

Fr Oliver Kennedy, of the Lough Neagh Fishermen’s Cooperative Society, which ran the eel fishery [PDF], has died at the age of 83.

The ESB eel-catching apparatus at Killaloe Bridge is being renewed (and not, as I feared, removed). Eels are caught now only to be transported around Ardnacrusha. Read about the fishery here and, at greater length, here.