New Research Article by Horstmeyer et al. 2016

In Part 2 of this article are presented the results of the assessment of condition, the rehabilitation requirement and the determined overall investment volume of the project “Condition of the public sewer system in Bavaria (As at 2012)”. The current status of the public sewer system in the whole of Bavaria can be forecast through the extrapolation of the figures surveyed in the project. From this, the already existing need for action for rehabilitation as well as the therefrom resultant foreseeable investment requirement for renovation and renewal can be derived. Along with the public combined and wastewater sewers also the status of the public property connections as well as the public manholes are analysed. The comparison to the previous status investigations also allows a significant picture to be drawn of the development of the public sewer system. The overall length of the public combined and wastewater sewers with immediate, short- or medium-term rehabilitation requirement in Bavaria amounts to some 12,400 km (14.5 % of the total public combined and wastewater networks). The mathematically required sewer rehabilitation rate is just short of 2100 km per year. With an actually determined annual sewer rehabilitation rate of some 1600 km an increase of the sewer rehabilitation activity of at least 30 % is required. To this still needs to be added the increase in sewers requiring rehabilitation generated by ongoing aging. The overall investment requirement for the known immediate short-to medium-term rehabilitation requirement in Bavaria amounts to ca. 5.8 billion Euros.