Sewer networks are either owned by private companies or by public authorities. This fact inevitably results in constraints which can often be detrimental to the function and capability of the networks. Inspections to check to see if systems are water-tight are often subject to different legal regulations and time targets.
Thus Pipe rehabilitation projects are often characterised by a lack of coordination and uniformity management which can jeopardise the desired success, i.e. the water tightness of the complete sewer system. But an effective protection of soil and ground water can only be achieved by coordinating private and public pipe rehabilitation measures.