It means if developers want to build a new housing estate, they're not allowed to plug into the main drainage sewer and thereby increase the flood potential of the system.
Instead they should catch water on the site with porous surfaces, grassy hollows to collect heavy rains, and on-site mini wetlands.
Some house-builders oppose mandatory SUDS, partly because it cuts their profit and partly because there are tricky questions about long-term liability for maintenance
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