20:36 Gavin Shuker (Luton South) (Lab/Co-op)

We completely agree with the Committee’s view that greater attention should be given to—SUDS—sustainable drainage systems as measures complementary to large infrastructure projects. In the case of the Thames tunnel, this can help to ensure that the effectiveness of the tunnel is not reduced with climate change and that we do not end up in 50 to 100 years’ time having to construct a second tunnel.

The Government have had much to say about their green deal programme at the Department of Energy and Climate Change, but little assistance is being extended to householders looking to purchase green roofs, water butts or downspouts to collect rain water that otherwise would go into our sewers, even though the advantages are obvious, with residents enjoying a notable reduction in their water bills and the sewerage system having to manage a lower volume of waste water. Over time, local authorities and the Highways Agency should replace hard, non-permeable surfaces with porous materials on pavements and public footpaths; home owners, too, should be encouraged to consider such measures. I do not underestimate the challenge that SUDS present to the status quo. Every year in London alone some 3,000 hectares of private domestic gardens are paved over—the equivalent of 2.5 Hyde parks. Such complementary measures should be part of a rolling programme, and we will return to them in the comprehensive water Bill, a draft of which the Minister promises in the forthcoming Session of Parliament.

On climate change mitigation and adaptation, we know that climate change will require some of our water treatment systems to take far greater volumes of waste and storm water, as well as require our water industry to reduce its emissions. By 2050, the industry—which already accounts for about 2% of our nation’s carbon footprint—will need to have contributed significantly to the 80% reduction in emissions required by the Climate Change Act 2008. At present, there is a tension between higher standards for waste water, often requiring higher levels of energy consumption, and the requirement to reduce the draw on our national grid. There is plenty of space for innovation, and a need for far more research on efficiency and devising new processes for raising standards of waste water. To help with this, we call on the Government to publish a road map, as they have with the motor industry, to sketch out a path to a low-carbon waste water industry.

The principle of the waste hierarchy should of course apply to any project under the national policy statement; the document refers to that directly. In that regard, more could be done to encourage new processes that harness the organic value of effluent. Will the Minister outline what discussions he has had with his counterparts at the Department of Energy and Climate Change and at Ofwat to ensure that the energy recovery process is maximised through the implementation of this document? We welcome this national policy statement, and we will not oppose the motion tonight.

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21:05 Mr Andrew Love (Edmonton) (Lab/Co-op)

We can best try to answer all three issues in relation to this site by using new technology. Using new technology will give us the additional benefit of future-proofing for likely required improvements in water quality over the extended life of the new Deephams, and it will also help to deal with further population increases—it is suggested that London’s population will increase significantly over the next 25 years—and, of course, climate change. If we are to future-proof for all three of those, technology will be very important. However, it must be tried-and-tested technology, and it must avoid the danger of being out of date even before Deephams is up and running.

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21:12 Mark Field (Cities of London and Westminster) (Con)

It is worth saying that population growth and climate change will not reverse the improvements that have already taken place. Given that a 60% reduction in discharges is on the way, it would take something much more significant to reverse the trend. The NPS identifies two potential factors—population growth and climate change—but neither seems of any great magnitude in relation to this issue. New housing developments are already being built with SUDS and mitigation designed in, and retrofitting will slowly improve the existing housing stock. Moreover, the NPS says that more than 1 billion litres per day of sewage need in England can be saved through water efficiency, but then bizarrely ignores how that can help offset the projected changes in London’s population.

Climate change is cited as producing more “extreme rainfall events” like those of August 2004; that may have an impact, as was discussed in the exchange with the hon. Member for Islington North. That discharge of eight years ago caused the death of many thousands of fish, yet on page 18, the NPS admits that the fish deaths were caused by the Mogden sewage treatment works, which of course have nothing to do with the tunnel, and are already being upgraded. Thames Water was quoted last week as claiming that climate change will produce less rainfall and more droughts, and will require more reservoirs to be constructed, which implies less in the way of combined sewage overflow overall.

Of course, the tunnel is not a complete solution, as there would still be discharges—no one disputes that for one minute. The notion of sustainability in the NPS leans heavily on the assumptions about population growth and climate change to which I have already referred. The Cardiff harbour system shows that new options have emerged since the tunnel was first mooted almost a decade ago, including the real-time monitoring of dissolved oxygen levels. I accept that an in-river system is not perfect and would not go as far as the Thames tunnel, but it would cost a fraction of the £4.1 billion price tag now in place. Were it not for the momentum already behind the building of the tunnel and the closed institutional ranks to which I have referred, I think that such a system would be considered, and perhaps it still should be.

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21:47 Richard Benyon

The hon. Member for Luton South mentioned the green deal, which of course has a blue element—hot water. I entirely share his ambition that the Government should examine the success that I am sure there will be in the green deal and see whether we can retrofit water-saving measures into households. There is a whole range of ways to do that. I refer him to our green infrastructure partnership, which is overseeing the retrofitting of large sustainable drainage systems into developments and which we hope will be a real success. He also made a point about energy recovery, and my noble Friend Lord Taylor is liaising with the Department of Energy and Climate Change on that important matter.

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