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  • Vertical distance between the surface of a snow layer and the ground, the layer being assumed to be evenly spread over the ground which it covers.

  • The temperature measured at a given depth. Typically -10 cm.

  • Elevation, at a certain location and time, of the water table or piezometric surface of an aquifer.

  • According to the WFD the assessment of the stauts of the surface water bodies is based on the evaluation of the monitoring results. According to Article 8 of the WFD, Member States must ensure the establishment of monitoring programs, inter alia, for surface waters. The monitoring of the surface water bodies is carried out at surveillance monitoring stations and operational measuring points. For surface waters, the WFD also foresees an investigative monitoring.

  • The pressure exerted by the earth's atmosphere at any given point, being the product of the mass of the atmospheric column of the unit area above the given point and of the gravitational acceleration at the given point. A value of standard or normal atmospheric pressure, equivalent to the pressure exerted by a column of mercury 29.92 inches (760 mm) high, or 1013 millibars (101.3 kilopascals).

  • The temperature of the atmosphere which represents the average kinetic energy of the molecular motion in a small region and is defined in terms of a standard or calibrated thermometer in thermal equilibrium with the air.

  • Due to the prolonged drought and the warm and sunny weather, we advise all citizens to reserve the use of drinking water, as far as possible, to essential uses such as food preparation and hygiene.

  • (1) Liquid or solid products of the condensation of water vapour falling from clouds or deposited from air on the ground. (2) Amount of precipitation (as defined under (1) ) on a unit of horizontal surface per unit time.