Analysis of information sources in references of the Wikipedia article "Yongding River" in English language version.
永定河之称谓始于康熙朝。康熙皇帝勤政,为人所共知;康熙皇帝大力治理浑河,将"无定河"改名为"永定河",亦见诸史册。
Beijing's government is spending 16 billion yuan (US$2.5 billion) on restoring the dried-out riverbed, filling it with water and creating parkland along the riverside.