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APPROVED DOCUMENT - GOV.UK
Pervious paving 44 Drainage systems 44 Alternative approach 44 Section 3: Surface water drainage 45 Outlets 45 Combined systems 45 Design rainfall intensities 45 Design 45 Layout 45 Depth of pipes 45 Pipe gradients and sizes 45 Materials for pipes and jointing 46 Bedding and backfilling 46 Clearance of blockages 46 Workmanship 46
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