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Shannon water for Dublin

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Comments

  • Registered Users, Registered Users 2, Paid Member Posts: 11,507 ✭✭✭✭John_Rambo


    Jaysus, look at the sub-head:

    "WHICH is preferrable; the restoration of a world-famous fishery in Limerick or spending billions of taxpayers money diverting polluted water to the citizens of Dublin?"

    It sets it up as “world famous fishery in Limerick” versus “diverting polluted water to Dublin”, like it’s some kind of moral showdown. That’s deliberately inflammatory language. It’s designed to get people angry, not to have an honest discussion. It also completely ignores the fact that this isn’t just about Dublin. The supply is for the wider Greater Dublin Area and surrounding counties in the east. It underpins water security for well over a million people and a massive chunk of the country’s economy.

    You can argue about cost, environmental safeguards or alternatives. Fair enough. But framing it as Limerick versus Dublin and pretending only “Dublin citizens” benefit is disingenuous and excludes every other county that would receive water. It shuts down proper debate before it even starts.



  • Registered Users, Registered Users 2 Posts: 1,165 ✭✭✭db


    Maybe you should look into the history of the area before you comment. It was one of the best salmon fisheries in the world before Ardnacrusha was built but now the river is clogged up with islands and trees and can no longer handle the flow. Unfortunately once the salmon are gone they won't come back but the ecology of the area could be improved by reducing the water in the canal and interesting it in the river.



  • Registered Users, Registered Users 2 Posts: 8,789 ✭✭✭Former Former Former


    none of which has anything to do with the pipeline



  • Registered Users, Registered Users 2 Posts: 1,165 ✭✭✭db


    It has everything to do with the pipeline, the future management of the lower river Shannon from Lough Derg to Limerick is the issue and that includes any future pipeline.



  • Registered Users, Registered Users 2 Posts: 10,150 ✭✭✭✭Birdnuts


    I would be of the opinion that the days of the ESB dictating to all the stalkholders along the Shannon via their (mis)management of Ardnacrusha needs to end. The facility is now producing such a tiny % of the states energy demand its time it was removed given the ongoing damage it is doing to the river in terms of its Salmon,Eel fisheries, water quality and flooding issues. Plus dam removal is being done increasingly internationally to revive dieing rivers.

    https://www.asce.org/publications-and-news/civil-engineering-source/article/2025/02/13/benefits-flow-as-historic-dam-removal-restores-klamath-river



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  • Registered Users, Registered Users 2 Posts: 8,789 ✭✭✭Former Former Former


    It has NOTHING to do with the pipeline.

    Not building the pipeline will not bring a single salmon back to the river.



  • Registered Users, Registered Users 2, Paid Member Posts: 11,507 ✭✭✭✭John_Rambo


    I read the history of the area before I commented.

    The salmon are gone now but the ecology of the area could be improved by reducing the water in the canal and increasing it in the river. That has nothing to do with the pipeline or the citizens of Dublin, it's a local problem. The article is pure bait to promote regional tensions and people like you are jumping on it.



  • Registered Users, Registered Users 2 Posts: 15,033 ✭✭✭✭Red Silurian


    Not sure if taking 2% of the water is going to have any impact one way or another on either Limerick or Dublin

    People are worried because they remember the drought of July 2018 when Dublin and its surrounds had the water turned off between 10pm and 5am but at the time you could walk across the Curragower falls as in the image below. 2% of the water removal at that time was going to make f**k all difference to either the region south or east of lough derg

    image.png


  • Registered Users, Registered Users 2 Posts: 6,589 ✭✭✭standardg60


    The 2% is taken solely from the water that flows through Ardnacrusha, which the esb will be compensated for.

    There will be absolutely no difference to water levels as the esb will just be including the abstraction rate in their current moderation of flow.



  • Registered Users, Registered Users 2 Posts: 6,589 ✭✭✭standardg60


    This is a good read on how water levels are controlled.



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  • Registered Users, Registered Users 2, Paid Member Posts: 8,825 ✭✭✭plodder


    Wasn't it originally part of this plan that a large reservoir was to be created on a bog in Kildare Offaly somewhere? You would think filling such a reservoir during high rates of flow in Winter would somewhat alleviate the problem of direct abstraction from the river at times of low flow. What happened to that plan? The way things are going climatically we may need more reservoir capacity in the future anyway.

    Post edited by plodder on

    “The opposite of 'good' is 'good intentions'”



  • Registered Users, Registered Users 2, Paid Member Posts: 4,250 ✭✭✭MacDanger


    Thanks for that - it looks like the 2% figure isn't just from the water which flows through Ardnacrusha but through the Parteen Basin (i.e. Ardnacrusha + "Old Shannon") and it's using an average annual figure

    It's interesting that on the one hand they're saying that the water being extracted for the pipeline will be simply reduced from the amount used by the ESB in which case as you say, there should be absolutely no difference to the water levels but in fact, the modelling shows that there are some differences. This is presumably due to the timings of the extractions by the ESB vs the continuous proposed extractions of a pipeline. Again, we're coming back to the use of averages versus worst case scenarios.

    The report also makes no mention of modelling the maxium outflows during a time of drought which seems like a fairly obvious error (and therefore begs the question of intentionally avoiding discussion of the worst case)



  • Registered Users, Registered Users 2, Paid Member Posts: 4,250 ✭✭✭MacDanger


    Just to be clear, I'm not even against this, I just think that the locals needs to be dealt with in an honest way and not have their concerns dismissed in a patronising manner.

    We see people all over the country who would benefit directly from infrastructure projects (Metro North, Bus Connects, etc.) and yet they still oppose them so it's not surprising when you have people who will see no direct benefit from a project but fear that they may be negatively impacted by the project, some of them are likely to oppose it.



  • Registered Users, Registered Users 2 Posts: 14,323 ✭✭✭✭LambshankRedemption


    And to add to that, we've had printers that didn't fit in the building they were bought for. The Childrens Hospital's opening has been delayed for the 18th time and don't get me started on the IT system going into the place. So, is it any wonder some people are dubious about such a huge infrastructure project?



  • Registered Users, Registered Users 2 Posts: 6,589 ✭✭✭standardg60


    No the 2% is entirely from the flow through Ardnacrusha, the flow through the old Shannon is a set constant which will be maintained (apart from when flooding risk requires an increase).

    As you can see from the modelling drought periods have indeed been included, the worst case being 1995 when abstraction would have led to a 68mm lower level. Given the operating band already over the basin and lough Derg is half a metre, this is drop in the ocean stuff.



  • Registered Users, Registered Users 2, Paid Member Posts: 4,250 ✭✭✭MacDanger


    Maybe but that's not what the report you posted says:

    The proposed abstraction of water will use a small fraction (approximately 2%) of the annual average flow through Parteen Basin



  • Registered Users, Registered Users 2, Paid Member Posts: 4,250 ✭✭✭MacDanger


    It looks at drought periods in terms of the level but it doesn't seem to adjust the extraction flowrate to account for the fact that the extraction rate will presumably increase during drought periods?



  • Registered Users, Registered Users 2 Posts: 1,165 ✭✭✭db


    The report only looks at data up to 2015 and doesn't go as far as the drought in 2018. During July of that year the flow through Ardnacrusha was 0 to maintain the minimum flow in the river. In a repeat of that drought any water abstracted from the river at Parteen Basin would directly impact the flow through Castleconnell. If the area served by the abstraction was suffering water shortages there would be huge pressure to keep the abstraction going.

    I don't think anyone is concerned about this for 99% of the time but it is the 1% when the damage will be done. If we are headed for more extreme weather in the future we will have more summers like 2018.



  • Registered Users, Registered Users 2, Paid Member Posts: 41,273 ✭✭✭✭Hotblack Desiato


    Because you need a river to feed a reservoir, and they can't extract any more from the Liffey.

    There will be new reservoirs built as part of the Shannon water scheme. These will be filled in the winter. Talk of running the Shannon dry in summer to feed Dublin is idiotic nonsense

    I'm partial to your abracadabra
    I'm raptured by the joy of it all



  • Registered Users, Registered Users 2 Posts: 10,150 ✭✭✭✭Birdnuts


    That would be sensible allright and bring several other benefits to water quality, flood aliviation, biodiversity etc. regionally. Unfortunatly BNM have earmarked most of these places for industrial windfarms as part of a government policy to Greenwash their Date centre plans etc



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  • Registered Users, Registered Users 2 Posts: 1,165 ✭✭✭db


    Where do you see that the pipeline will be stopped during the summer? None of the reports I have read mention this. In fact, they talk about getting agreement from ESB to turn off Ardnacrusha so they can keep pumping.



  • Registered Users, Registered Users 2, Paid Member Posts: 3,296 ✭✭✭KrisW1001




  • Registered Users, Registered Users 2, Paid Member Posts: 4,250 ✭✭✭MacDanger


    Does anyone have details of what volume of new reservoirs are being built? Is it a 1 day / week / month worth of water?



  • Registered Users, Registered Users 2 Posts: 1,165 ✭✭✭db


    I don't think the capacity of the reservoir has been made public.



  • Registered Users, Registered Users 2, Paid Member Posts: 9,468 ✭✭✭markpb


    The bad projects get the news. The good projects go by silently. It would be foolish to point to two or three projects and claim that the state can’t build anything in a reasonable way.

    Both Revenue and the Passport Office have completely modernised, introduced efficient processes and complex IT systems that are far better than many countries. Luas Cross City was built on time and within 4% of its budget. The Courts of Criminal Justice in Dublin, Terminal 2 and the North Runway in Dublin airport and the Ringsend WWTP upgrade project were all on budget and on schedule. Most of the motorway projects in the 90s were the same after the learning of the first few.If we waved our hands and worried about infrastructure projects possibly being late, we’d never build anything.



  • Registered Users, Registered Users 2 Posts: 6,589 ✭✭✭standardg60


    Nope it's all public, the reservoir will be 75 million litres.

    As for a 'Dublin' project, there will be new supply to Nenagh, Carlow, Mullingar and Drogheda amongst others.



  • Registered Users, Registered Users 2, Paid Member Posts: 4,250 ✭✭✭MacDanger


    Thanks. In the previous doc you shared, the abstraction rate is down as "330Mld" - I presume that's 330 million litres per day?

    If that's the case, then a 75 million litre reservoir is only ~6h worth of pumping making it more of a buffer tank than a reservoir



  • Registered Users, Registered Users 2 Posts: 6,589 ✭✭✭standardg60


    You read my mind I was just working that out!

    Yes circa 6 hours to fill, which means that most of the water will actually be supplying the other areas mentioned.



  • Registered Users, Registered Users 2 Posts: 6,589 ✭✭✭standardg60


    And yes, it's really only a buffer, Dublin will still be getting the vast majority of it's water from the Liffey.



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  • Registered Users, Registered Users 2, Paid Member Posts: 3,677 ✭✭✭Cyclingtourist


    With all their complaining about flooding I'd have thought Shannonsiders would be offering to pay Dubliners to take some of the water.



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