Flood Defences

Baroness Humphreys Excerpts

Wednesday 26th November 2014 Grand Committee

[Baroness Humphreys (LD)]

My Lords, although the noble Baroness’s Question asks about the Government’s plans for adequate flood defences in the UK, I hope that she will allow me to turn my attention to the situation in my part of Wales, for which the Welsh Government have responsibility—although, of course, they are restricted by the Barnett settlement in the amount of funding that they receive from the UK Government. I am sure that the Minister takes an active interest in flood defences throughout the UK, including Wales.

I shall give some explanation of my interest in this debate. My interest, like that of many noble Lords, comes from where I live. I live in north Wales in the Conwy Valley, through which the Conwy river flows. The river has its source in Lake Conwy, in the area surrounded by the Migneint and Berwyn mountains, and flows into the sea at Conwy. The river and its name, as noble Lords can no doubt imagine, sometimes dominate our lives.

The small town in which I live, Llanrwst, sits at one of the narrowest points of the river and has an almost iconic status within Wales as the town that is always affected by floods. Year after year, newspaper and television reports have shown the damage to properties and the devastation to the lives of some of our inhabitants. Comparatively recent floods in 2004 and 2005, where there were three flood events within two years, left over 60 properties flooded, some of which flooded twice in a matter of days, leaving householders unable to sell their properties or arrange future insurance cover.

I am among the first to criticise the Welsh Government for their failures but I am also among the first to praise them when the occasion allows, and this is such an occasion. The work begun by the then Environment Minister for Wales, Jane Davidson, and Environment Agency Wales, is now beginning to come to fruition and, hopefully, the residents of our town can have more confidence in being able to withstand the powers of future floods. I offer these descriptions as examples of actions that Governments can take.

Over the intervening years since 2005, the Welsh Government have put schemes in place to alleviate the floods. Although they are designated as flood alleviation schemes, they can also be described as providing flood defences for the town. A £3.2 million major engineering scheme—85% funded by the Welsh Government, with the remaining 15% funded by Conwy County Borough Council—saw tunnelling work carried out under our streets and the construction of a massive culvert. Flood gates now automatically open when the floodwater rises. The water is stored under our streets until the river level begins to drop and the gates again open to allow the water to flow back into the river. One of the characteristics of the River Conwy is that it is tidal from its mouth at the Irish Sea to about two or three miles north at Llanrwst. When a high tide is coming up river and meets the torrential floodwaters making their way down from the mountains, our town becomes the pinchpoint.

The Conwy Valley is primarily rural and one of our major industries is agriculture. Over the years, flood banks have been constructed alongside the river, leaving the rich soil of the flood plains to be grazed, or cultivated by farmers. This added to our problems, narrowing the river channel and increasing the pressure of both flood and tidal waters and increasing the speed with which they met.

In a further £7 million scheme, funded by European objective 1 funding, a Welsh Government block grant and Environment Agency Wales’s flood defence budget, other steps have been taken to deal with the problem. In very sensitive talks with local agricultural representatives and farmers, agreement, with compensation, was reached to reduce the height of the flood banks, allowing 450 acres of low-lying land to be flooded and allowing the flood plains to do the work that they should have been doing over the years. Further flood banks were then constructed at the next village down river, Trefriw, in order to protect homes there. Perhaps I should add here a comment and warning that flood defences in one particular location can have a knock-on effect on other locations further down river.

All these measures have proved successful and following the latest flood event in the valley in January 2013, when 95 millimetres of rain fell in two days and the volume of water was equal to that of 2005, a spokesperson for Environment Agency Wales said:

“Homes in Llanrwst and Trefriw were protected as a result of the flood scheme completed in 2010 … We have seen unprecedented levels of rainfall in 2012 and it is testament to this initiative and the hard work of our officers that the defences held up to safeguard properties in Llanrwst and Trefriw“.

In another part of the £7 million scheme, Dutchdam and Bauer demountable defences were selected and purchased to protect the most vulnerable properties, if all the other measures fail. These barriers can be erected quickly, which is essential for use in an area where the river rises quickly and where there can be a relatively short warning period. Mercifully, there has been no need for these barriers yet, but, as others who live close to rivers will testify, one can never be certain.

Work has recently been completed to protect a further 42 properties close to one of the small tributaries which flows through the town and is liable to flood estates as the water backs up and tries to join the fast-flowing and more powerful River Conwy. This scheme, again funded by the Welsh Government and following a plan developed by Conwy County Borough Council, aims to increase the capacity of the existing watercourse by raising flood walls, realigning and increasing the size of culvert inlets and replacing trash screens.

Those of us who live in close proximity to water have a healthy regard for its power, force and unpredictability and would never be foolish enough to say that such schemes are guaranteed to make flooding a thing of the past. We all understand that each river and each incident of flooding has its own characteristics and a solution achieved in one location will not necessarily apply to another location, but our experience in the Conwy Valley shows that innovative thinking and creative engineering can make a difference.