Allowable values of observedProperty element

Code	Label	Definition
AQUI	Aquifer recharge	Total volume of water added from the outside to the zone of saturation of an aquifer through the natural water cycle.
ART_GW_RECH	Artificial groundwater recharge	Total volume of water added from the outside to the zone of saturation of an aquifer through artificial recharge only.
EVAP_TSP	Actual evapotranspiration	Total volume of evaporation from the ground, wetlands and natural water bodies and transpiration of plants. According the definition of this concept in hydrology, the evapotranspiration generated by all human interventions is excluded, except un-irrigated agriculture and forestry. The 'actual evapotranspiration' is calculated using different types of mathematical models, ranging from very simple algorithms (Budyko, Turc-Pyke, etc.) to schemes that represent the hydrological cycle in detail. Please do not report potential evapotranspiration (i.e. "the maximum quantity of water capable of being evaporated in a given climate from a continuous stretch of vegetation covering the whole ground and well supplied with water").
INFL	Actual external inflow	Total volume of actual flow of rivers and groundwater, coming from neighboring territories.
OUTFL	Total actual outflow	Actual outflow of rivers and groundwater into the sea, plus actual outflow into neighboring territories.
PRECIP	Areal precipitation	Total volume of atmospheric wet precipitation (rain, snow, hail, etc.).
SNOWP	Snowpack	Volume of snow accumulated and stored over a period which can result (fully or partially) in snow melted water. It does not include the glaciers, and it is measured at a reference time.