My Lords, I have not spoken in this part of these deliberations. I draw your Lordships’ attention to my interests as a practising chartered surveyor and a vice-president of the Local Government Association. More particularly, in the course of my professional work, I have had to deal with the design and application of such things as sustainable drainage systems, whether that might be full sustainability—full SUDS—or whether it be an attenuation, which I might call SUDS-lite. Let us not make too much of that particular distinction.
I recall that, not too long ago, I had reason to pay a visit to the Building Research Establishment at Watford. One thing that came out of that visit was a discussion on sustainable urban drainage systems—and one of the remarkable things about it is how little land is actually needed to achieve an acceptable system. So it does not seem to me to be quite as the Minister said. He raised the objection that this was heavy-handed and would in some way prejudice smaller sites, where things were more constrained. But I refer your Lordships to the non-statutory technical standards, as may be published by the Minister from time to time. It seems to me that that gives the Minister the tools to make different rules for different circumstances, as the situation may arise. With the greatest respect to him, I am not sure that I follow his line of argument.
We need to remove the issue of surcharging water that has to be dealt with by the statutory undertaker; whether that be surface water that is channelling down some pipe because of a cloudburst or whether it be a combined system, whereby surface water is getting into foul water, which then has to be dealt with in dilute but vast quantities at a sewage treatment works, it is part and parcel of the same problem of volume and disposal. We need to be aware that it is not always in the interests of the sewage undertakers to delimit what goes into their pipes, because of course that gives rise to the justification for large capital works to increase and expand it. I do not think that we should be following that; there are grounds for attenuating these things on or near a site to deal with surface water run-off. Quite apart from the issue of localised flooding and run-off, the whole process of attenuation should and could have been part of standard building regulation practice for at least the last 20 years, and I am really surprised that there is a substantial resistance on it. If the noble Baroness decides to divide the House, I am afraid that I shall be voting with her.