perforated plateperformanceperformance of the dampericlasepericycleperigean tideperigeeperiglacialperimeterperimeter trench methodperiodperiod of vibrationperiodic disturbing forceperiodic forceperiodic timeperiodic unsteady flowperiodic variationperipheral visionperistyleperliteperlite concretepermafrostpermanentpermanent actionpermanent deformationpermanent flowpermanent formpermanent hardness of waterpermanent loadpermanent motionpermanent snow linepermanent water levelpermeabilitypermeability coefficientpermeability reducingpermeablepermeable groundpermeable materialspermeable rockpermeable weirpermeameterpermissible areapermissible curvaturepermissible deviationpermissible loadpermissible regionpermissible stresspermissible stress methodpermissible tractive forcepermissible unit tractive force
