Glossaire de A à Z


Valley

Updated on 04/12/2018
Définition
Sens commun
Elongated and more or less flared depression dug by a stream or a glacier.
Source
according to the Larousse dictionary

Valve/Gate

Updated on 06/09/2018
Définition
Sens commun
Movable device for stopping or leaving free passage to water. For example: gates are used by dams or locks, valves in hydropower plants.
Source
according to the Larousse dictionary

Variable cost

Updated on 13/07/2018
Définition
Sens technique
Part of the cost of production which varies with the level of production. For example, the purchase costs of raw materials are variable costs that increase when the volume of activity or production increases.
Source
According to AFB

Vegetated discharge area

Updated on 25/02/2019
Définition
Sens technique
Space developed between the wastewater treatment plant and the receiving environment of treated wastewater discharges (it is not part of the wastewater treatment plant). The vegetated discharge areas (VDA) are characterised by the use of plants (mostly aquatic but possibly also terrestrial) and their planting close to the treatment plant, in the space remaining after the building of this plant. The VDA is not a wetland as there is no "long presence of natural water". It is also not a grass strip, specific to the mitigation of non-point source pollution (pesticides, fertilisers, sediments, etc.), especially in agriculture.
Source
according to AFB and IRSTEA

Viaduct

Updated on 06/09/2018
Définition
Sens commun
Large road or rail bridge, usually consisting of several bays and crossing at high elevation a valley.
Source
according to the National Centre for Textual and Lexical Resour

Vulnerability

Updated on 13/07/2018
Définition
Sens technique
Fragility and susceptibility when facing a given hazard or a given pressure.
Source
According to SOeS

Vulnerable area

Updated on 13/07/2018
Définition
Sens technique

According to the Directive 91/676/EEC of 12 December 1991 called "nitrates", it means an area designated as vulnerable especially considering the characteristics of land and water as well as all available data on the nitrate concentration in water. Areas that feed waters are defined as: either affected by pollution (groundwater and surface freshwaters, especially those used for the abstraction of water intended for human consumption, whose nitrate concentration exceeds 50 milligrams per litre, and estuarine, coastal and marine waters and surface freshwaters which have undergone

Source
According to AFB

Vulnerable species

Updated on 13/07/2018
Définition
Sens commun
Species whose entry into the category of endangered species is considered likely in the near future in case of persistent factors that are the cause of the threat.
Source
According to the Ministry for the Environment and AFB