Tag Archives: water level

Clashganny Lock on the Barrow

I would be grateful if anyone could explain the holding tank at Clashganny. Waterways Ireland’s water-level gauge [Flash thingy; takes ages to load] at Clashganny is named “Clashganny Holding Tank”.

A threat to an existing navigation

I have a page here about the River Maigue, one of Ireland’s oldest improved navigations. Incidentally, the river’s name is locally pronounced Mag, to rhyme with bag.

In 2009 I wrote to the Powers That Be to suggest that the (much to be desired) bypass of Adare, a major bottleneck on the N21 Limerick–Tralee/Killarney road, should pass to the south of the town, thus avoiding the interference with the navigation that would undoubtedly have resulted from a northern bypass. It was no doubt the strength of my case, and a recognition of the importance of the navigation, that caused the Powers to opt for a southern bypass. A proposed link to a proposed M20 Limerick–Cork motorway may have been a minor factor in their decision: as nobody was going to build a motorway to Kerry, Adare would piggyback on the motorway to Cork.

However, An Bord Pleanála overturned the decision [PDFs available here] because the M20 proposal was withdrawn. The Irish Cattle and Sheep Farmers’ Association is pleased because it wanted a northern bypass of Adare, to be linked to a new road from Limerick to the port of Foynes; its submission on the matter is here [PDF]. A Limerick ICSA chap has a letter to the editor about the Foynes link in the current issue of the Limerick Leader, although it’s not yet available online.

Now, this proposal has the drawback that it might actually be slightly sensible: a better road to Foynes might stop people agitating for a restoration of the railway line and enable a speedy ending of port activities in Limerick, thus removing large piles of scrap from the riverside. But have the ICSA not considered the damage to the turf-boat traffic to Adare if a road bridge is added to the railway bridge downstream of Adare?

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.

Winter Quarters

At Leinster Mills, Naas Branch, new year's eve 2013

At Leinster Mills, Naas Branch, new year’s eve 2013

Levels

Folk who have boats tied to fixed jetties on Lough Derg might like to check their ropes: the water level has risen quite a bit and some ropes are bar-taut.

Effin stats

I wrote here about Maureen O’Sullivan’s questioning of ministers about Effin Bridge, the lifting railway bridge below Newcomen Bridge on the Royal Canal in Dublin. It seems that she would like a drop-lock to replace the bridge, thus enabling boats to pass under the railway at any time without interfering with the operation of the trains. Which would be very nice, but that it would cost over €5 million and cause significant disruption to the railway during construction.

I was distressed by Ms O’Sullivan’s failure to make any sort of economic case for the drop-lock or for any other measure that might allow for free movement of boats on that section of the Royal Canal. I said:

As the expenditure on reopening the Royal Canal is a sunk cost, I am all in favour of making its use easier — provided that it can be demonstrated that (a) there is a demand for increased use, (b) such increased use will have benefits that outweigh the costs of any improvements and (c) no alternative investment offers better returns. As far as I can see, Ms O’Sullivan has demonstrated none of the three: indeed I see no evidence that she has even considered them.

Ms O’Sullivan’s position might be described as favouring an increase in the supply of possible passages along that section of the canal, but I thought it might be interesting to know what the demand for such passages was, so I asked Waterways Ireland how many boats had passed under Effin Bridge in 2013.

I was wrong about the number of days on which the bridge was lifted: nine lifts were available altogether. Six were on Tuesdays, two on Saturdays and one on a Sunday (to facilitate the Dublin boat rally):

Tuesday 16 April 2013:           0 boats
Tuesday 30 April 2013:         10 boats
Sunday 5 May 2013:            24 boats
Tuesday 21 May 2013:           0 boats
Saturday 1 June 2013:           8 boats
Tuesday 18 June 2013:           2 boats
Saturday 20 July 2013:          3 boats
Tuesday 13 August 2013:       7 boats
Tuesday 17 September 2013:  4 boats

So that’s 58 boats in a year.

I asked what the cost was: I was told that Irish Rail charges €1200 per weekday lift and €2000 per weekend lift. I presume that Waterways Ireland itself incurs other costs, perhaps overtime at weekends, but I don’t know what they are. The cost per boat for each lift was:

Tuesday 16 April 2013:           0 boats: lift cancelled as no boats wanted it
Tuesday 30 April 2013:         10 boats: €120.00 per boat
Sunday 5 May 2013:            24 boats: €83.33 per boat
Tuesday 21 May 2013:           0 boats: lift cancelled as no boats wanted it
Saturday 1 June 2013:           8 boats: €250.00 per boat
Tuesday 18 June 2013:           2 boats: €600.00 per boat
Saturday 20 July 2013:          3 boats: €666.67 per boat
Tuesday 13 August 2013:       7 boats: €171.43 per boat
Tuesday 17 September 2013:  4 boats: €300.00 per boat

The total charged to Waterways Ireland (not to the boaters) by Irish Rail was €10800.00.

Suppose that a drop-lock had been built for €5000000. Would it be worth investing that amount to save an annual expenditure of €10800? I suspect not, although I am open to correction by anyone capable of calculating NPVs or other relevant measures.

It seems to me, though, that the case for any capital expenditure is weak while demand for passages is lower than supply. Perhaps Royal Canal enthusiasts might work on attracting more boats to the Dublin end, whether from the Shannon end or from the Grand and Liffey.

 

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.

Bolshevism, boats and bridges

The balance bridge crossing the canal, near Newcomen-bridge, as designed and erected under the superintendence of Mr Bindon Stoney, engineer of the Dublin Port and Docks Board, has been completed, and adds considerably to the facilities for carrying on the traffic. This bridge has been erected in substitution of a lift-bridge, constructed in 1872, but to which an unfortunate accident occurred in February, 1878.

Ralph S Cusack, Chairman, in the report of the Directors of the Midland Great Western Railway, 19 February 1879, quoted in the Freeman’s Journal 27 February 1879

In mid-October I mentioned that Maureen O’Sullivan [Ind, Dublin Central] had asked the unfortunate Jimmy Deenihan [FG, Kerry North/West Limerick, and minister for waterways] about Effin Bridge, the lifting railway bridge below Newcomen Bridge on the Royal Canal in Dublin. The bridge is lifted, to allow boats through, on [IIRC] one Saturday each month in the summer, making five lifts a year. Waterways Ireland says on its website [click Bridges if necessary]

The Newcomen Lift Bridge in Spencer Dock is owned and operated by Irish Rail, and requires a rail possession to be lifted. It can only be lifted for boats at limited prearranged times organised with Waterways Ireland. For details of opening times and to arrange passage contact the Eastern Regional Office on 01 868 0148.

Maureen O’Sullivan wanted

… a meeting of interests concerned with the operation of the lifting bridge with a view to devising a management and operational system that is less hostile to the use of the waterway as currently it is an impediment and discouragement to navigation on the Royal Canal and an obstacle to navigation-communication between the Royal Canal and River Liffey and between Royal Canal and Grand Canal at their eastern reaches […].

Jimmy Deenihan said

The bridge is operated by Irish Rail staff on a request basis at Waterways Ireland’s expense.

However, he wasn’t giving any hostages to fortune by making rash promises or even by commenting on whether the bridge was an impediment to navigation. But Ms O’Sullivan was undeterred: she returned to the topic with two written questions on 5 November 2013 and a priority question, no less, on 7 November 2013 [for certain values of “priority”]. On 5 November she asked two questions of Jimmy Deenihan

To ask the Minister for Arts, Heritage and the Gaeltacht further to Parliamentary Question No. 59 of 16 October 2013, the extent of railway track that needs to be closed by Irish Rail in order for a vessel on the Royal Canal, Dublin, to be given access between the First and Sea Levels of the Royal Canal; if there has been an assessment of whether the extent of track closure could be reduced to facilitate greater ease of navigation on the Royal canal; and if he will make a statement on the matter.

To ask the Minister for Arts, Heritage and the Gaeltacht further to Parliamentary Question No. 59 of 16 October 2013, if the option of a introducing a drop lock to replace the need of the lifting bridge has been considered since the establishment of Waterways Ireland or if that assessment was made by Waterways Ireland’s predecessors; the level of use of the sea level assumed in relation to the assessment; if the impact of the Spencer Dock Greenway was taken into account and vice versa, was account taken of the impact on the Greenway were the sea level to be made accessible to navigation by replacing the lifting bridge; if the assessment includes analysis of whether the effective re-opening of the sea level of the Royal Canal to meaningful levels of year-round traffic would be consistent with the EU’s commitment to the ‘protection and preservation of cultural heritage, in view of the fact that Dublin’s waterway’s heritage is part of the cultural infrastructure of Europe, contributing to economic attractiveness, job opportunities and quality of life; and if he will make a statement on the matter.

The ever-patient Mr Deenihan replied:

I am advised that the option of constructing a drop lock to replace the need for the lifting bridge at the location in question has been considered by Waterways Ireland but it was not deemed viable due to the estimated costs involved, given that the minimum cost for a drop lock to replace the bridge would be of the order of €5m. Work to install a drop lock at this location would also involve considerable temporary works, the extent of which would be unknown until ground conditions were assessed in detail.

I am also advised that there have been no assessments or analyses undertaken by Waterways Ireland in respect of the level of use or impact on the Spencer Dock Greenway.

I can inform the Deputy that the length of railway track disconnected from the rest of the loop line from the station when the bridge is in the ‘up’ position is approximately 16 metres. However, as the control and operation of the railway line in the vicinity of the lifting bridge lies entirely with Irish Rail, only it can indicate the extent of the permanent rail line that needs to be closed when the bridge is opened.

He might also have pointed out that €5m is more than WI’s entire capital budget, which is under €4m for all southern waterways for 2014. And if he were an argumentative chap, he might have pointed out that there is no evidence of a demand for

… the effective re-opening of the sea level of the Royal Canal to meaningful levels of year-round traffic …

and no evidence that it would be of any economic benefit to anyone, least of all the residents of Dublin Central, even if boats were travelling that way every day of the week.

He might, if he were an impatient sort of chap, have pointed to the idiocy of the “cultural heritage” argument: with one or two minor exceptions, pleasure craft were not part of the “cultural heritage” of the Royal but, even if they were, such “heritage” wouldn’t be worth millions that might be spent instead on bringing soup to the deserving poor of Dublin Central.

Ms O’Sullivan was back with more on 7 November, this time trying to get Leo Varadkar [FG, Dublin West] to get the National Transport Authority to include Effin Bridge and the Sheriff Street non-lifting bridge (not a Scherzer) included in a National Transport Authority study of “the management and movement of people and goods to, from and within Dublin city centre”. Ms O’Sullivan’s rather confused and confusing case seemed to be that there was a greenway, and there were walking and cycling routes along the canal, so a road bridge (that works perfectly well for carrying a road) and a railway bridge (that works perfectly well for carrying a railway) should be included  in the study because the canal has navigational potential.

Or something. She even managed to bring water polo [does she mean canoe polo?] into the argument.

As far as I can see, walking, cycling, road travel and rail travel — and even water polo — are not in any way adversely affected by the current arrangements, while the canal is of negligible importance in the movement of people and goods. Boating on the canal is a leisure activity for a small number of people who are sufficiently well heeled to own pleasure-boats; I am rather surprised to find that their interests are a matter of such concern.

As the expenditure on reopening the Royal Canal is a sunk cost, I am all in favour of making its use easier — provided that it can be demonstrated that (a) there is a demand for increased use, (b) such increased use will have benefits that outweigh the costs of any improvements and (c) no alternative investment offers better returns. As far as I can see, Ms O’Sullivan has demonstrated none of the three: indeed I see no evidence that she has even considered them.

What’s depressing here is the absence of any indication of a rational approach to capital spending on waterways. They’re still cargo: a magical source of wealth, that will bring peace and prosperity as long as we all believe in fairies and avoid facts, thinking and analysis.

No wonder the country is in a state of chassis.

Update 15 November 2013: some information about demand for passage under Effin Bridge.

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.