My Lords, this has been a very interesting and short debate, and I shall be brief. I hope that noble Lords will accept that, while we join them in supporting the use of sustainable drainage, there are flaws that make the proposed new clause simply unworkable, and a potentially serious impediment to the delivery of new homes. As the noble Lord, Lord Krebs, said, we have heard the arguments at some length during the Bill, and I can only reiterate our position that we will review the impacts of the current planning policy on sustainable drainage. That is a definite reassurance.
On the point that the noble Lord, Lord Krebs, raised on why by building now we might be storing up problems for later, when determining planning applications, local planning authorities are expected to ensure that flood risk is not increased elsewhere. In areas at risk of flooding, they should ensure that priority is given to the use of sustainable drainage systems. There is also an expectation that sustainable drainage systems will be provided in all new major developments, unless demonstrated to be inappropriate. A site-specific flood risk assessment is required for planning applications for a development likely to be affected by local sources of flooding, and should look at all forms of flood risk, including from surface water. The developer is responsible for providing effective drainage already to serve the development and agreeing it with the local planning authority. I hope that, with the continuing reassurance about looking very closely at the issue in our review, noble Lords will reject the amendment.