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THIS TIME LAST year the country was assessing the damage caused by storms Desmond and Frank. Rivers up and down the country burst their banks. Homes, fields and roads were flooded. One year on, we need to rethink how we manage flood risk.
Our climate is warming. Major flood events, currently expected once in every 50 years, are likely to occur once every 10 years by the second half of this century. Compounding this situation is the reduced capacity of the landscape to lessen the impacts of flooding.
Topography, soil type and land use determine the rate at which water travels into river channels and thus combine to influence the tendency of a river to flood.
Profound changes in land-use since the 1960s have generally sped up the flow of water through each river catchment. Heavy rainfall therefore takes less time to reach river channels. When so much water travels quickly, there is a greater chance of rivers bursting their banks.
Urban and agricultural expansion and intensification
In recent decades, urban and agricultural expansion and intensification, often onto historic floodplains, have made floodplains and wetlands less able to deal with flooding. Hard paving in urban areas and soil compaction from intensive farming both lessen the permeability of land.
Replacing woodlands, scrub and wetlands with ploughed fields or buildings reduces the space for floodwaters to rest. Instead of allowing rivers to spill over on to floodplains during times of heavy rainfall, floodplains across the country have been drained and “reclaimed” to increase farm productivity.
Similarly, when shopping complexes or housing developments are built, land is infilled and raised to protect it from flooding. Embankments and engineered barriers add to this separation of the river from its floodplain. If we take into account the cost to wider society of these developments, we would not allow them to be built.
When water has no place to go but straight to the river channel by the quickest route
We end up having to compensate by widening and deepening channels by dredging. This has been practiced since the 1950s to reduce waterlogging so land can carry more livestock or produce higher crop yields.
A 2015 report from the Office of the Comptroller and Auditor General found that the benefits likely to be derived from carrying out such arterial drainage, in purely financial terms, are “likely to be only marginally greater than the costs”.
Because dredging often reduces local flooding, it is associated with comprehensive flood relief. However, by increasing the volume of water that passes through a channel at any given time, dredging increases flood peak and so exacerbates downstream flooding.
More flooding means that politicians and local authorities are put under pressure to allocate public money for more dredging. Rather than managing flood risk and incorporating wider catchment management, the response involves flood resistance and structural defences. By putting all our eggs in one basket, we are only increasing vulnerability in flood prone areas.
Natural flood management
Another approach, called “natural flood management”, is gaining recognition as a viable and cost-effective approach to flood risk management. Natural flood management takes a whole-catchment by managing soil, wetlands, woodlands and floodplains to retain water in the catchment and slow the flow at times of flood risk.
Restoration and creation of habitats such as flood meadows and reed beds can act as important stores for flood water and can help to encourage reconnection of rivers with their floodplains.
There are projects across Europe and further afield that have restored peat bogs, planted riparian woodlands, restored and created new wetlands, and re-profiled rivers and their floodplains to hold back floodwaters.
In the UK, landowners are incentivised to participate in natural flood management. This not only prompts the farmers to help alleviate flooding on a catchment scale, but can also help them deal with increased flooding while continuing to provide a source of income.
However, natural flood management is an approach that is virtually unknown in Ireland and has not been widely discussed in any relevant spheres here. There have been no trials or pilots of catchment based approaches to flood management in Ireland, despite our growing problem and hard evidence that natural flood management can be an effective means of significantly reducing flood peak.
Land-use influences the patterns of flooding
The response to flooding must involve a radical rethink of land-use policy. This means agricultural and planning policy both have a major role to play in how we adapt to a future in which storms, heavy rainfall and flooding will be much more frequent.
Natural flood management offers additional benefits to biodiversity, climate change mitigation, and water quality. Implementing natural flood management will require incentivised land-use management such as payments for woodland creation in key locations and for allowing certain lands to flood as part of a catchment based approach. Such a shift will require public support and the involvement of landowners and rural communities.
Anja Murray is an ecologist and environmental policy analyst whose research report, “Natural Flood Management: Adopting ecosystem approaches to managing flood risk”, has just been published by Friends of the Earth on www.foe.ie. Anja also presents RTE’s Eco-Eye and it will be looking at the wider issues of flood risk management in its ‘Fighting Flooding’ episode on Tuesday 14th February RTE 1 at 7pm.
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Reverse drainage of bogs and natural reservoirs. Plant native broadleaf trees especially on higher areas. When rain hits forested areas only 1/3 gets to the ground.
Some sense regarding floods in Ireland. Now, getting the government to adopt such a plan will be another challenge.
Our climate is not warming. That is a hoax. We have allowed building on flood planes. In other words, a plot of land looks nice in June and we buy it. But when there comes heavy rain it floods. Old people knew these areas and they are marked on maps as “area liable to flood”.
Victims can’t accept that the blame lies with them. So they blame climate chance and impose a carbon tax. Just because Professor John Sweeney of Maynooth says its warming, does not prove him right.
@Val Martin: but it’s not just because Prof Sweeney of Maynooth says it though, is it? If climate-change deniers told me it was raining I’d have to go outside and check.
Find out more about the future of flooding in Ireland with Anja Murray and Duncan Stewart on Eco Eye tomorrow at 7:00 pm on RTE One!
The two lads are doing a great job .. My arse..
Midland bogs all gone. no soakage, no drainage of the shannon. No global warming either
Hundreds of thousands of acres of Co. Clare flooded during and after Storm Desmond. Here’s a reminder https://m.youtube.com/watch?v=hpcxsHkG5OY#
In the parts of the west of Ireland we have large areas of Karstified Limestone Bedrock ( see some on GSI website ) in these areas conduit flow of water of water (ebb/flow ) is commonplace through “swallow holes” ( also called estavelles ). Many of these have become blocked ( grass,rubbish etc )and in some cases physically filled in , it is vital that all these swallow holes are identified,marked on maps and cleared,to allow flood waters to drain away quickly.There are dozens of these swallow holes that appear to be ignored by our GSI,and OSI,AS THEY HAVE NOT BEEN UPDATED on their websites
The Minister for the Environment has a grand plan to have x,000 new homes built shortly. Unfortunately, they will have to go on land which soaks up rain water and, if we follow our usual pattern, will discharge their rainwater instantly to the nearest pipe to river, and thus flood those downstream of them. On the East coast, most of the flooding is transient, so if rainwater is stored, and, better still, used for flushing the loo (thus reducing the demand Irish Water has to supply), some of this flooding can be avoidable. Also, use soak pits in place of drain pipes, including soakpits on every concreted front lawn; and ditches in the central medians of motorways etc to contain rain water for a short time. (The M4/N4 surface water goes straight into the Liffey) I tried to influence this course of action in a letter to the Irish Times, but they did not publish; nor did they publish any equivalent… We will build the houses without anticipating the flood-abatement need. At that stage there’s be another Minister for the Environment…
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The Dutch have committed to a billion euro per anum investment into the Delta Works and related flood defences given the North Sea’s expected 1 metre rise over the next 80 years, the period of the earmarked investment.
Has anyone knowledge of what Ireland has earmarked for flood defences here? Given the roaring success of the iodine tablets issued by our Nuclear Minister Joe Jacobs I’m tempted to think Inda’s ordered a load of tartan-coloured vaccum flasks and a few ton of sandbags from Quinn.
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