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BS EN 13508-2:2003+A1:2011
Investigation and assessment of drain and sewer systems outside buildings. Visual inspection coding system (British Standard)
This European Standard is applicable to the establishment of the condition of sewers, drains, manholes and inspection chambers by inspection, status codification and consideration of external factors and other information. It is applicable to drain and sewer systems, which operate essentially under gravity, from the point where the sewage leaves a building or roof drainage system, or enters a road gully, to the point where it is discharged into a treatment works or receiving water.
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British Standards Institution [bsi]
British Standards Institution [bsi]