Skip to main content
Normal View

Seanad Éireann debate -
Wednesday, 9 Mar 1994

Vol. 139 No. 12

Adjournment Matters. - South Galway Flooding.

I thank the Minister for taking this matter on the Adjournment. There has been a major problem during recent years in the south Galway area due to flooding. The flooding in south Galway is unusual in that most other areas of the country which are noted for heavy flooding have not experienced it to the same extent as south Galway.

The problem in south Galway arises due to the karst limestone geology of the area. There are many underground water courses and swallow holes, the most famous being the lake in Coole which found fame in the poem "The Wild Swans of Coole" by W.B. Yeats. The water level of the lake rises in the winter as a result of underground water sources. Four years ago and this year the water level was much higher than at any time in the past. It is difficult to understand why the level has increased, although a number of reasons have been put forward. One reason offered is that as a result of the drainage of many thousands of acres of the Slieve Aughty mountains by Coillte for forestry development, water gets to this part of the county more quickly.

The Minister will have seen the effect of the flooding on television. Thousands of acres have been covered in water and people have had to leave their homes. The Geological Survey Office has issued a report on the flooding and has given an indication of what must be done to alleviate it. I ask the Office of Public Works to take that report on board and to initiate a development proposal. The proposal would, in the first instance, open the swallow holes to allow the water to travel faster into the underground caverns. Second, the Office of Public Works could look at the possibility of cutting a channel which would be piped from the Coole lake to the sea in Kinvara, a distance of about five miles.

The Minister will probably say this is not the responsibility of the Office of Public Works under the 1945 legislation. However, it is not the responsibility of any other Department because it does not come under the heading of arterial drainage. The Department of Agriculture, Food and Forestry has informed me that it is not that Department's responsibility. The Department of the Environment and the county council have also disclaimed responsibility. It is a major problem. The Taoiseach's involvement is also being sought. In that context, I hope the Office of Public Works can be allocated extra money to open one of the swallow holes on a trial basis. That would not cost an enormous amount of money. Second, a plan for a piped channel between Coole and Kinvara should be drawn up and costed.

Unless remedial action is taken, roads, houses and thousands of acres of land will continue to be flooded. People have to travel as many as nine miles further than usual to avoid flooded roads in the Shanaglish area in Gort and in the Peterswell area. The national primary road near Kiltartan was flooded for a period during the recent rains.

I thank the Minister for listening and I hope my comments will be considered.

I thank Senator Fahey for raising this matter. The Minister of State, Deputy Noel Dempsey, is unable to attend this evening and he asked me to reply on his behalf.

As you are no doubt aware, the Commissioners of Public Works are the statutory authority charged with responsibility for arterial drainage pursuant to the provisions of the Arterial Drainage Act, 1945. In their endeavours since the passing of the Act, the commissioners have provided substantial improvement in conditions to more than 650,000 acres of land previously subject to periodic flooding or waterlogging.

Schemes carried out to date, which number well in excess of 40, are geographically widespread and cover most of the Twenty-six Counties, not least Galway. However, the south Galway area is fairly unique in its geological formation. Limestone in the area has been subject to a process called Karstification with all its inherent distinctive and unusual features, such as swallow holes, sparse and intermittent streams, bare rock, large underground caves, springs and turloughs. Most of the rainfall in this particular area disappears underground shortly after the numerous streams flowing down from Slieve Aughty reach the cavernous limestone where it must flow underground to Galway Bay as there is no surface outlet.

A report prepared by the Geological Survey of Ireland in 1992 shows that the underground drainage system consists of swallow holes where the water enters the ground, caverns and conduits in which the water flows and risings or springs where the water re-emerges. The capacity of the underground drainage system depends on the size of the conduits and caverns and the degree of clogging of the conduits.

While the report refers to a number of possible ways of alleviating flooding, it concludes that the construction of extensive drainage channels or tunnels is not a viable option. The cost is likely to be enormous as virtually all the work must be undertaken through rock and the impact on the environment is likely to be excessive. The report also concludes that such a scheme would be difficult to undertake successfully.

With regard to the environment, it will do no harm to point out that the area contains many areas of scientific interest or national heritage areas, a number of wetlands of national and international importance and, of course, the extensive nature reserve at Coole. Any scheme for the improvement of drainage or the relief of flooding in the area would need to have the strictest regard for the serious adverse effects it would most likely have on these areas.

Apart from the Dunkellin and Lavally rivers in the extreme north of the area in question, which have not so far been treated under the 1945 Act, none of the rivers or streams flowing through this limestone region is included in the national arterial drainage programme of the Commissioners of Public Works. In all circumstances, the Minister has no power to provide for works in the area in the commissioners' 1994 Estimate.

I will inform the Minister of State at the Department of Finance, Deputy Dempsey, of Senator Fahey's points and he can discuss them with him directly.

The Seanad adjourned at 8.13 p.m until 10.30 a.m on Thursday, 10 March 1994.

Top
Share