Dynamic Metabolism Modeling as a Decision-Support Tool for Urban Water Utilities Applied to the Upstream of the Water System in Oslo, Norway

AbstractThe paper presents, first, the ‘Dynamic Metabolism Model’ (DMM), developed by the authors, followed by an application to the city of Oslo, capital city of Norway. The time period considered for the analysis is 2013-2043. The external factors impacting decision-making and interventions are talked about in brief, and some realistic scenarios revolving around these factors are drawn up for testing, after consultation with officials at the Oslo Water and Wastewater Works. Possible interventions that the utility intends to set in motion on the upstream are defined and numerically interpreted for incorporation into the DMM

WaterMet2: a tool for integrated analysis of sustainability-based performance of urban water systems

Open Access journalThis paper presents the "WaterMet2" model for long-term assessment of urban water system (UWS) performance which will be used for strategic planning of the integrated UWS. WaterMet2 quantifies the principal water-related flows and other metabolism-based fluxes in the UWS such as materials, chemicals, energy and greenhouse gas emissions. The suggested model is demonstrated through sustainability-based assessment of an integrated real-life UWS for a daily time-step over a 30-year planning horizon. The integrated UWS modelled by WaterMet2 includes both water supply and wastewater systems. Given a rapid population growth, WaterMet2 calculates six quantitative sustainability-based indicators of the UWS. The result of the water supply reliability (94%) shows the need for appropriate intervention options over the planning horizon. Five intervention strategies are analysed in WaterMet2 and their quantified performance is compared with respect to the criteria. Multi-criteria decision analysis is then used to rank the intervention strategies based on different weights from the involved stakeholders' perspectives. The results demonstrate that the best and robust strategies are those which improve the performance of both water supply and wastewater systems.European Union Seventh Framework Programme (FP7/2007-2013

Quantitative Assessment of Future Sustainability Performance in Urban Water Services using WaterMet²

TRUST project / IWA Cities of the Future conference, Mülheim an der Ruhr, Germany, 28-30 April 2015Urban water services are likely to face challenges in the future, mainly due to population growth, climate change, increasing urbanization and ageing infrastructure. These factors are expected to impose significant strains on the performance of urban water services. This would subsequently decrease the capacity and quality of services in the urban water system (UWS) and thus negatively affect different dimensions of the sustainability framework (i.e. economic, environmental, social, asset and governance) presented by Alegre et al. (2012). Performance of future sustainability in the UWS can be evaluated by using simulation of metabolism-based processes in the urban water cycles over a pre-specified horizon. The WaterMet² model developed in the TRUST project quantifies the metabolism-based performance of the integrated UWS. The integrated modelling of the UWS implies the whole processes and components in an urban area related to water flows as a complex and interrelated system. A mass balance approach of water is followed within the system. WaterMet² enables the calculation of quantitative key performance indicators (KPI) of urban water services over a long-term planning horizon. These KPIs encompass various aspects of water systems sustainability such as cost (economic), GHG emissions (environmental), water supply reliability (social) and leakage (assets). WaterMet² can support various intervention strategies by calculating the relevant quantitative KPIs which can be used for a multi-criteria decision analysis in a decision support system framework. The overall KPI values (calculated on a per-capita basis) obtained from the UWS can be used for comparing sustainability indicators of water services among different cities. The comparison of KPI values in the main UWS components reveals the critical components for which appropriate intervention options should be undertaken.European Union Seventh Framework Programme (FP7/2007-2013

Quantitative UWS performance model: WaterMet2

© TRUST 2014The report presents a detailed description of the WaterMet2 methodology and tool as a quantitative urban water system (UWS) performance model. The WaterMet2 model is described in three distinct parts. Modelling concepts of different components in WaterMet2 are first described. It provides an overview of the principle flows/fluxes modelled in spatial and temporal scales in WaterMet2 and how they are modelled within the framework of mass balance equations in four subsystems (water supply, sub-catchment, wastewater and water resource recovery). The second part describes the WaterMet2 software. This consists of an overview of WaterMet2 on how input data are prepared, how to run a simulation and finally how to retrieve results in different formats. This part also introduces the WaterMet2 toolkit functions which can be used by other programming languages to call a WaterMet2 simulation model. In the third part, WaterMet2 is illustrated using the city of Oslo UWS as a generic reference model. This part first describes building and calibrating a WaterMet2 model for the existing UWS which faces water scarcity problems for a 30-year planning horizon starting from year 2011. Then, it examines two alternative intervention options (i.e. adding new water resource and water treatment options) which are supported by the WaterMet2. These options are examined for the UWS model and the improvements are compared to the business-as-usual case.European Union Seventh Framework Programme (FP7/2007-2013

Gestion patrimoniale des systèmes d'assainissement fondée sur l'analyse de risque

Colloque avec actes et comité de lecture. International.International audienc