water supply systems drinking water 7 municipalities 3 simulation and modelling 3 water supply engineering 3 repairs 2 underground structures 2 more ... defects 2 reliability 2 water tubes 2 maintenance 2 galleries (mining) 2 price 1 disinfection of water 1 house gas pipelines 1 economy 1 facility management 1 history 1 environmental hygiene 1 quality 1 water quality 1 sewerage 1 sewer networks 1 corrosion of material 1 bridges 1 underground water 1 surface waters 1 natural ecosystems 1 heat distributions 1 tunnels 1 less ...