isobaric chartisobaric processisobaric surfaceisobathisochionisochron mapisodistanceisohyetisohyetal lineisohyetal mapisohypseisohypsicisomorphisomorphismisonephisonivalisopiestic mapisopluvialisothermisothermal atmosphereisothermal equilibriumisothermal layerisothermal processisotopicisotropicisotropyisovelisovelsisriciterationiuhivanov methodjar testjardangjetjet disintegrationjet flowjet nozzlejet percussionjet streamjet thicknessjet trajectoryjettingjointjumpjump heightjump height and stage discharge relationshipjump in nonrectangular channeljump in rectangular channeljump in sloping channel