英语翻译The first spills in early 1922 (Fig.4) began to erode th

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英语翻译
The first spills in early 1922 (Fig.4) began to erode the
foundation at the downstream toe.Subsequently,an apron was
added and the spillway training walls were improved.These
measures reduced the hazard.Finally,in 1959 a thorough hydraulic
study led to the installation of a reinforced concrete
flip bucket at the downstream edge of the apron

在1922年初的首次溢出（图4）开始侵蚀下游坝趾的地基.后来,加上了防冲护砌,溢洪道的导流墙进行了改善.最后,在1959年,彻底的水力研究导致了在防冲护砌的下游边缘安装了增强的混凝土挑流鼻坎.

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