The Dalang Weir (irrigation system) has benefited local people in the Chengdu Plain since its completion in the early Qing Dynasty. After extensive research of historical background details, and channeling scenes of the Weir construction, and sifting through relevant literature in combination with chronicles, chorography, and tablet inscriptions from the Ming and Qing dynasties, assembled evidence indicates that the Weir was built during the autumn of the first reign to the spring of the second reign of Emperor Kangxi. The Weir is an important expansion of the famous Dujiangyan Irrigation System and after analyzing and assessing the value of the project under the principle of “making the past serve the present,” it is also proof of a Buddhi...