The construction of the dam is believed to guarantee its own practical impermeability.
"The Panama Canal and its Makers"
Vaughan Cornish
On the outskirts of Ewell the Battery was splashing through puddles of water; the coats of horses and of men had darkened; guns, poles, and caps carried chaplets of raindrops; and all those stern riders, so proud and scornful, with chins hidden in high, upturned collars, and long garments disposed majestically over their legs and the flanks of the horses, nevertheless knew in secret that the conquering rain had got down the backs of their necks, and into their boots and into their very knees but they were still nobly maintaining the illusion of impermeability against it.
"The Roll-Call"
Arnold Bennett
Wearing the paper with the assurance, for instance, that because of its impermeability to air it keeps the part more thoroughly protected from variations of temperature and from such possibilities of transudation as have before been possible, serves to lift patients out of themselves and affords relief.
"Psychotherapy"
James J. Walsh