This European Standard specifies the general principles for the management and control of cleaning operations in
drain and sewer systems and specifies requirements for implementation of cleaning programmes and for working
practices.
It is applicable to drain and sewers systems outside buildings, 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. Drains and sewers below buildings are included provided that
they do not form part of the drainage system of the building.