Study On Methodology And Its Application For Integrated Urban Water Conservation Planning

Under the serious situation of water resources shortage, urban water conservation which could alleviate the crisis has become essential to the nation's development and social harmony. The traditional urban water conservation has some limitations. This study aims to create a methodology of integrated urban water conservation planning to provide our urban water conservation more technical and strategic support.By analyzing the structure of urban water systems and the related planning, water-saving techniques, water management and planning, benign water cycle was defined as"fair matching of healthy natural water cycle and efficient social water cycle". Based on this, the concept of integrated urban water conservation plan was created.Comprehensively analyzing current methods of related plans, the methodology of integrated urban water conservation plan was created. The core of this methodology is the water supply and demand balance model between multi-source and multi-user. The steps include situation assessment, target identification, scenario design, potential analysis, balance analysis, and the implementation of countermeasures.According to the data and functional requirements of the integrated urban water conservation platform, basic database was designed as a combination of urban basic database, urban water system database and spatial database. The function includes map display, data management and maintenance, water use analysis, evaluation of water conservation level, etc. Taking Daxing District as a case, apply integrated urban water planning methodology to conduct study about integrate water planning. In the recommended scenario, amount of water-saving was 8.06 million m~3 in 2010 and 20.76 million m~3 in 2020; the amount of recycled water was 12.63 million m~3 in 2010 and 19.61 million m~3 in 2010, the supply and demand of non-conventional and conventional water sources is balanced. Countermeasures for water-saving potential and water supply potential were brought separately. The countermeasures for water-saving potential include four parts: life, industry, environment, and leakage, and that for water supply potential include water reuse and rainwater use. The main potential users of reuse water were identified, take construction investment as the objective function to optimize, and get the economic optimal water distribution of reuse water program.