My Lords, once again, it is a real pleasure to follow my noble friend the Duke of Wellington and to support his Amendment 162, which seems a very good response to the Minister’s claim in respect of the last grouping that it was altogether far too expensive to prevent CSO discharges and the damage done to our rivers by our sewage treatment works. My noble friend’s amendment asks for continuous improvement of sewage works, and it should be accepted.
I shall speak to Amendment 162A in my name. It is probably superfluous, and I am merely probing to get an assurance from the Government. In the light of what we know about the state of our rivers and of getting to grips with some of the future problems—for example, the necessary but dramatic rise in planned housing provision and the fact that we probably have too many people per cubic metre of water in many parts of our country—it is important that the drainage and sewerage management plans work.
The amendment is designed to ensure that the plans work not only for present and future customers but for the environment. Above all, and I stress this, it is important to get this emphasis on the environment into this part of the Bill, so that Ofwat, in its authorisation of capital expenditure by water companies, is aware that environmental considerations are a legal necessity. I hope the Minister will be able to reassure me on that specific point.
Turning to my other amendment in this group, Amendment 163A, on nature-based solutions, I realise that this has already been touched on today, but I thought I would use the amendment to drive home the message. “Nature based solutions” is a better name than the alternative of a sustainable urban drainage system, or SUDS, the point being that these solutions are just as important in rural areas as in urban.
Like trying to fit modern heating systems into old houses, it has to be admitted that retrofitting natural drainage solutions into existing communities can be
expensive and difficult, but it is crucial that, starting right now, we insist that all new developments consider nature-based solutions from the start. It should be a compulsory part of the planning system. The main message I wish to get across is that Schedule 3 to the 2010 Act, as mentioned in Philip Dunne’s Bill, must be implemented in England as it already is in Wales, because these schemes have to be planned before the design of the site even starts. They are dependent on gravity, whereas every other service to a site can, as it were, flow uphill. The positioning of these nature-based solutions is therefore crucial, and they should be the first thing designed into any new site.
Let me give a brief example of a retrofitted nature-based solution which also perhaps helps explain what it is all about, and which could even be a model for new developments. I refer to the Greener Grangetown scheme, as it is called, near Cardiff. It consists of 12 streets and is now a series of rain gardens. The water is cleansed, and many trees grow there. What is essentially a drainage scheme has become a community garden scheme looked after by people of the community. The CSO is no longer needed, as storm conditions are already catered for. I admit that such a scheme is probably too expensive for mass replication, but, with its many outputs, it attracted many willing partners and investors. Businesses and local government wanted to get involved, so it is not totally unrepeatable with the right local driving force. When the Severn Trent Mansfield pilot has produced some results, we might be able to introduce more schemes across the country, confident that we know what works and what positive outcomes we can expect.
It is worth stressing that one of the major purposes—in fact probably the main purpose—of nature-based solutions is that they deal successfully with much of the problem of road run-off, which is such a contaminant of our rivers. As well as the oils and grease from roads, 63,000 tonnes of rubber tyre particles go into our rivers every year, plus suspended solids which coat the bed of the river, hydrocarbons and dissolved metals which are toxic to fish, and benzo(a)pyrene, which is very carcinogenic. Highway run-off needs treating, and most sewage treatment works are not really designed to deal with its particular pollutants. Meanwhile, at the moment, highway authorities can connect their drains to sewage works without the water companies being able to deny them. We must do all we can to introduce nature-based solutions, wherever we can.
To summarise—and I apologise if this is over labouring my point—nature-based solutions have four main benefits. First, they slow the flow, which of course helps the CSO problem; secondly, they act as filtration plants to remove road oils, grease, hydrocarbon pollutants and microplastics; thirdly, they clean the water, whether it is going back into the river or down into an aquifer; and, fourthly, and not unimportantly, they provide beauty and habitats. As I said, they should be everywhere.