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This book contains fifty six technical papers from the SREE Conference on Hydraulic Engineering held in 2012 in Hong Kong. With the economic-social development, water cycle system shows dualistic characteristics. The high-intensity human activities cause changes to water cycle process, deriving society, economy and environment subsystems, and lead to resource subsystem weakened and ecological subsystems degenerated. To guarantee economic-social sustainable development, it is required to explore the efficient mode of water resources development. The multi-dimensional regulation of water cycle system is an effective means to promote the synergetic development of five-dimension subsystems. To optimize water regulation, evaluation and selection on regulation schemes are required. There are a large number of studies about evaluation and selection methods on regulation schemes. The fuzzy theory was applied to water resources redistribution scheme evaluation and decision-making in Tseng-Wen and Kao- Ping River Basins by Chen and Chang, Srdjevic et al. combined basin simulation and evaluation technology of regulation schemes as an improved TOPSIS method based on entropy for evaluation on Jacuipe River Basin regulation schemes. Locus incorporated hydrological model, reservoir operation model and basin water demand prediction model, and took the deficiency amount of basin water resources as an index to evaluate water resource management measures in Pinios River and Lake Karla Basin. GA was used to guide the restoration measures of water pollution, so as to complete the optimal selection on restoration measures. Multiple decision analysis theory based on Analytic Hierarchy Process was used to evaluate water supply schemes in Kwara State, Nigeria by Okeola and Sule. Based on entropy theory, order degree entropy function was set to evaluate and select multi-dimensional regulation schemes in Haihe River Basin.