| If this phreatic groundwater layer is just a few meters thick, it may run dry during the dry season, leaving your well empty. |
| In 1990 John Cordingley found that the sump had disappeared and that the passage continued along a tube to a step up into a small phreatic rift. |
| Gravitational sediments can enter a cave system in the form of entrance talus material, colluvium, roof fall, or phreatic infiltrates. |
| Also, important surfaces are affected by quarries and sand exploitation which deepen the river beds and decrease the level of phreatic water. |
| The characteristic tuffs of the Balder Formation originate from phreatic eruptions from the incipient continental rift zone between Eurasia and Greenland to the west. |
| That in 4390 was large and complex, with eruptions at the central vent and radial fissures on the flank, submarine and phreatic eruptions, and pyroclastic flows. |
