Improving the communication with stakeholders: The infrastructure degradation index and the infrastructure histogram

Abstract

Water infrastructures are rapidly ageing without being properly replaced. Communicating the state of the network and the sector’s needs to stakeholders is key for guaranteeing the sustainability of water and sewage systems. The infrastructure value index (IVI) is becoming a standard in the water industry as a communication tool; however, as a single value metric, it can mask key information. The complementary use of the infrastructure degradation index (IDI) and the infrastructure histogram (Hi) can provide a better understanding of the network’s state while maintaining the simplicity of the analysis needed for public dissemination. The IVI is focused on the value of the infrastructure, the IDI on its median remaining life. The HI provides a detailed but simple picture of the network’s remaining life, providing a clear idea of the magnitude of the investments needed in the future for maintaining the infrastructure.