Resiliens inom dricksvattenområdet ur ett beredskaps- och beroendeperspektiv

Sammanfattning: The drinking water infrastructure is among our most critical infrastructures and hence it is important for society to secure. Today, there is a lot of critical infrastructures that are dependent on different conditions to uphold its functionality. These critical infrastructures are often interdependent as well. This Master Thesis aims to examine how the preparedness within the Swedish drinking water infrastructure is progressing, which is done by answering three questions. How is the drinking water infrastructure dependent of other critical infrastructures? How can the effects of these dependencies be quantitatively analyzed with regard to the resilience within the drinking water sector? What is done today and what needs are there in order to minimize the vulnerabilities linked to the identified dependencies? To obtain this information, an interview study and a simulation study was performed. It appeared that the top dependencies within the drinking water sector is electricity, personnel, telecommunication and transports of purification chemicals and spare parts. In a situation where the electricity supply is lapsing, transports of fuel to the back-up generators are needed. From the simulations and modeling it appeared that electricity was affecting the system the most. Neither the telecommunication, personnel supply nor the transports affected the system to that magnitude which may prove the high redundancy that exists in the drinking water network. While it was clear to the sector how the top dependencies behaved, indications showed that synergistic effects and cascading events may need to be examined further.