Expression inventée sur le modèle de la Trame Verte et Bleue, appliquée à la continuité écologique des sols. Largement ignorés pendant de nombreuses années, ces derniers sont pourtant essentiels au fonctionnement des écosystèmes. Ce terme désigne le réseau écologique en profondeur, à préserver et restaurer.
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Quantity of water that the soil can hold and return immediately to the roots of plants. It is expressed in millimeters (mm).
The extractable soil water (RU) is the fraction of the soil water reserve available to the plant, or that which can be extracted by the plant through root suction. It is expressed in millimetres of water.
Extraction of fresh water from a groundwater source or surface, permanently or temporarily, and conveyed to the place of use. Water abstractions include all activities related levies generated by agriculture, industry (including energy), the supply of drinking water, or other (mineral spring authorized, production artificial snow).
Area on which the water that soaks into the ground supplies the abstraction for drinking water.
Warning issued in advance by the departmental flood forecasting services. In the event of heavy rainfall or hydrological alert, a flood warning is sent to the Prefect, who then alerts the mayors of the catchment areas concerned.
Warning issued in advance by a special state service (flood forecasting service). In the event of a rainfall or hydrological alert (triggering when thresholds are exceeded), the flood forecasting service offers the Prefect the alert of the mayors of the watersheds concerned. As a severe overflow flood, the flood warning service broadcasts, for prefects and mayors, hydrological situation bulletins and information on the evolution of water levels . In 1994, 54 flood warning services monitored 16,000 km of waterways in France using automated measurement networks.