Большой англо-русский и русско-английский словарь
free crest of spillway, free spillway, clear-overflow weir, free-flow [free-overfall] weir
Англо-русский словарь технических терминов
free crest of spillway, free overflow, free spillway, clear-overflow weir, free-flow [free-overfall\] weir
Русско-английский политехнический словарь
free crest of spillway, free overflow, free spillway, clear-overflow weir, free-flow [free-overfall] weir
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unsubmerged weir