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уровень воды в верхнем бьефе stresses
hydr.	water level of upper pond
hydrol.	headwater elevation; upper water level; upstream water level
Makarov.	headwater; headwaters
ocean.	upper water level
road.wrk.	upstream water line; upper pond level
tech.	upstream level; headwater level

уровень воды в верхнем бьефе: 9 phrases in 5 subjects

Agriculture	3
Geology	1
Melioration	1
Road works	3
Water resources	1