Sustainability evaluation of Beijing water deployment model before and after South-to-North Water Diversion
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Abstract:
Water scarcity has been a major constraint for both social and economic development in Beijing. When the middle route of the nation’s enormous south-to-north water diversion (SNWD) project begin to supply the water, it is supposed that more than one billion cubic meters of water will be diverted into Beijing annually. This paper focuses on quantitatively evaluating the relative sustainability of Beijing water supply system before and after SNWD project. The four alternative water resources deployment scenarios are considered for the assessment of sustainability in 2020, using the Water Evaluation and Planning System (WEAP) software, the existed water demand and also the supply data of Beijing. The sustainability indices are presented for each scenario, and two of those alternatives are proposed to enhance the sustainability of entire water supply system. Our results showed that the SNWD could significantly contribute to the relief of the water scarcity, and the proposed alternatives will be more beneficial in terms of comprehensive water resources utilization, thus eventually ensure a sustainable water supply in Beijing.
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