Application of city water balance model to develop strategies for urban water management in Hanoi, water balance, contaminant fluxes /T.B.N. Duong.

Urban water management is facing with a couple of problems such as inadequate water supply, untreated wastewater disposal and stormwater management. Particularly, in developing countries it seems to be a long way to overcome these problems. Integrated urban water management (IUWM) is considered as one the powerful management method to solve those problems. This approach links managing water supply, wastewater and stormwater as a unit of management. As many urban area in the developing world, Hanoi is dealing with pollution in receiving water bodies, ground water depletion and flooding. With support from SWITCH project, this research was conducted to seek an integrated urban water system management through a small typical sub catchment in Hanoi. City Water Balance model (CWB), being used in SWITCH project to assess the water and contaminant balance within the urban water system, was power tool for this research. Within the model applications of stormwater harvesting, wastewater recycling and roof-greening are example of urban water management was carried out. Climate change scenario was simulated and compared to calibrated baseline. Last but not least, ""WIDEN AND WIN'' URBAN WATER STRATEGY FOR HANOI was proposed to start and widen the implementation of above urban water management options towards IUWM. The study contributed some significant results. The first one is a specific answer to water and contaminant flows of Hanoi's water system. The second one is a range of sustainable urban water management options including rain water harvesting, wastewater recycling and green roof. The third one is the proposed urban water management strategy. This was concretized by Volunteer and Demonstration plan. In addition, a database of three water components (water supply, wastewater and stormwater) and interaction among them in the study area of Hanoi's water system were presented through the outcome of the CWB model. Based on these findings this research is valid reference for policy-makers working on Hanoi's water sectors