Investigation and assessment of drain and sewer systems outside buildings - Visual inspection coding system Ingestion-build-78747 but it only provides a

but it only provides a detailed description and methodology for the three levels of Type A testing

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DAT logotypes

This International Standard specifies a set of 128 characters

ISO 11124‑2 provides ranges of particle sizes

Investigation and assessment of drain and sewer systems outside buildings - Visual inspection coding system Ingestion-build-78747 but it only provides a1 Scope This European Standard is applicable to the investigation and assessment of drain and sewer systems outside buildings. It is applicable to drain and sewer systems, which operate essentially under gravity, from the point where the wastewater 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. Drains and sewers below buildings are included provided that