Sveinung Saegrov
The objectives of this Work Area are to develop, according to state-of-the-art systems analysis approaches, tools for metabolism analysis and systems performance evaluation of the urban water cycle services (UWCS). This is done by taking into account the economic, social and environmental boundary conditions of the urban water systems, and examining in detail the technical functions of the water services, including the physical assets, key activities and technologies of each subsystem of the urban water service system. This forms the basis for quantifying resource consumption inputs, waste and emission outputs, and risk issues, in order to document the present and possible future overall system sustainability performance (economic, environmental, safety).
The metabolism concept is referring to an examination of type-age characteristics of the physical assets (such as pipe networks, pumping stations and treatment facilities) in the various subsystems of the UWCS, as well as the characteristics of water, stormwater and wastewater flows within the system. The metabolism model then identifies and quantifies the (metabolic) flows of resource inputs (i.e. energy, materials, chemicals) and waste and emission outputs, according to what is actually the metabolic turnover needed in order to operate the urban water system under given boundary conditions. When the physical metabolism of a given urban water system is modelled in qualitative and quantitative terms, it is possible to carry out a performance evaluation of the system, with respect to given economic, environmental, safety and reliability performance criteria.
The TRUST Approach
Work Package 3.1 will present the definition of performance assessment criteria and the corresponding performance indicators system to be used in the UWCS metabolism and performance model. A simple self assessment tool will be developed as a motivational driver for utilities, allowing for performance and sustainability benchmarking of their current UWCS.

This will be supported in Work Package 3.2 by a risk-based quality assessment and management of the UWCS subsystems and their corresponding activities and technologies. Included will be risks in relation to service levels and environmental and economic performance.

Work Package 3.3 develops the UWCS metabolism and performance model, in line with the premises from Work Package 3.1 and Work Package 3.2.

The model and software developing work of Work Package 3.3 will be carried out in close connection with an empirical stream of research in Work Package 3.4, where the city of Oslo is actually used as a generic model city to avoid the risk of developing theoretical without sufficient empirical inputs and dialogue.

Once a reliable UWCS metabolism and performance model approach has been achieved, partly due to the inputs from the generic model city, this model will be further applied to selected case city studies in WA 6, to check their status with regard to system metabolism and performance characteristics, reveal potentials for improvement and anticipate the medium-term future situation towards for example 2040. In this way, TRUST aims to give water utilities a sustainability performance analysis tool for urban water services, which can be used to assess and improve their current status, and through quantitative analysis and benchmarking prioritize policies and new technological measures.