crest of spillway
/kɹɛsˈɛntɪk ˈdjuːn/
n
English · crest of spillway中文 · 溢洪道堰顶Español · cresta del aliviaderoFrançais · seuil de l’évacuateur
意味：Cement crest over which the reservoir’s overflow discharges when the spillway gates are opened.