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водонепроницаемый слой stresses
cem.	dampproof course; waterproofer
construct.	impervious layer; impervious blanket
geol.	impermeable bed
geophys.	impermeable layer
hydrol.	watertight stratum
Makarov.	impermeable stratum; impervious stratum
oil	retainer
railw.	watertight layer
tech.	impervious bed
водонепроницаемые слои
Makarov.	impervious strata

водонепроницаемый слой: 5 phrases in 3 subjects

Hydraulic engineering	1
Road works	3
Stratified plastics	1