清浄な都市水環境の経済的価値：持続可能な開発のための政策分析

在报告所述期间，该研究员完成了在两个城市-印度尼西亚雅加达和印度钦奈的研究。这两项研究通过两阶段支付卡技术应用条件估值法（CVM）估计了各种水质改善（基于国家水质标准的可游泳和可捕鱼水质）的经济价值。在每种情况下都进行了两次调查，即试点调查和主要调查。雅加达的研究结果表明，不到一半的居民愿意为改善城市水体质量的计划做出贡献。雅加达居民表示，每月使用的可游泳水质的WTP为1.70美元，可捕鱼水质的WTP为1.08美元，而一次性支付的非使用WTP分别为1.75美元和1.18美元。平均每年的总经济价值为8900万美元。在钦奈市的情况下，56%的居民愿意为旨在改善城市水体水质的计划做出贡献。此外，对于可游泳的水质，使用的支付意愿估计为0.58美元，对于可钓鱼的水质，使用的支付意愿估计为0.52美元;相应地，非使用的支付意愿显示为2.52美元和2.21美元。在这两种情况下，影响支付意愿的主要驱动因素是：城市居民的收入和教育水平。研究结果可以为政策制定者和水资源专业人员提供有关纳税人支持的有用信息，以及城市水质改善计划和项目的首选预算。

In the reporting timeframe, the Fellow completed studies in two cities - Jakarta, Indonesia and Chennai, India. Both studies estimated the economic values of various water quality improvements (swimmable and fishable water quality based on the national water quality standards) through application of Contingent Valuation Method (CVM) through two-stage payment card technique. There were two surveys in each case, pilot survey and main survey. Results of Jakarta study suggest that the less than half of the residents are willing to contribute to a program that will improve the quality of the city’s waterbodies. Residents of Jakarta expressed monthly use WTP of US$1.70 for swimmable water quality and US$1.08 for fishable water quality, whereas one-time payed non-use WTP US$1.75 and US$1.18 accordingly for above-mentioned water qualities. Aggregated average total economic value is US$89 million per year. In case of Chennai city, 56% of its residents are willing to contribute to programs aimed to improve water quality in the city’s waterbodies. Moreover, use WTP was estimated equal to US$0.58 for swimmable water quality and US$0.52 for fishable water quality; non-use WTP showed US$2.52 and US$2.21 accordingly. The main drivers that impact WTP in both cases are: income and educational level of city’s inhabitants. The findings could provide policymakers and water professionals with useful information about taxpayers’ support for, and preferred budget for water quality improvement programs and projects in the city.