Glossaire de A à Z
Information collection programmes involving public participation in a scientific process. This participation is carried out in particular for the collection of field observations. An example is the Vigie-Nature participatory science programme founded by the National Museum of Natural History.
Part of slow-flowing aquatic environments, where the bottom is too deep to allow plants to grow.
Physical and chemical characteristics of water. Inside a water analysis, the observed parameters are quite numerous, and all of these allow to determine the physical-chemical water quality, which determines the maintenance of river biodiversity. These parameters could be for example, temperature, turbidity, concentration of organic matter, mineral, nitrogen, etc.
Set of microscopic plant organisms that live in suspension in water (algae ...). Phytoplankton is the first link in the food chain in the marine ecosystem. There are approximately 4,000 phytoplankton species worldwide. Some of them can proliferate significantly by forming red, brown or green waters, other species are toxic but most of them are completely harmless.
In the strict sense, a device used for measuring the pressure head at a given point in an aquifer system, which indicates the pressure at that point, by allowing the observation or recording of an unconfined water level or a pressure. The piezometer concept was extended to all man-made (wells, wells, gravel pits, etc) or natural structures (sinkholes, caves, etc) that allow access to groundwater. We then rather speak of non-operated well which allows measurement of the groundwater level at a given point of the water table. This level which varies with the groundwater exploitation provides information about the…
The piezometric record is the collecting of the evolutions in time of the monitored groundwater level or piezometric level (see piezometric level). It consists of measurements that link the water level to a given date. Depending on the variability of groundwater level, the measurements are more or less close in time. The measurements obtained are positive or negative with respect to the measurement benchmark: they are positive when the groundwater level is below the benchmark measurement (the most common cases) and negative in the opposite case (artesian wells). Artesian: a well is artesian when the water is gushing. A record is represented by a curve which is time-slotted to be stored in a succession of points, each point representing a groundwater level at any given time. Points are linked to each other by means of a code that indicates whether a point is related to the preceding point in time. If the point is not related, it is then the initial point of a new part of the record…
Arbitrary function of the concentration of one or more pollutants which is a measure of the potential harmfulness of pollution.
Regulatory and operational framework for action in case of accidental pollution of the sea, to coordinate human resources and mobilize control means. The POLMAR plan was implemented in 1978 (Circular of the Prime Minister) after the Amoco Cadiz disaster. A circular from the Prime Minister dated 17 December 1997 confirmed the existence of two types of action (two components): the POLMAR/SEA plan which is triggered by the maritime prefects and deals with interventions at sea, and the POLMAR/LAND plan which is triggered by the prefects of the Departments concerned by coastal
Assessment unit of organic pollution found in water representing the quality of organic matter discharged per day per capita. This measurement unit can easily compare the flow of pollutants. Among the parameters * characterizing pollution, the pollution treated in wastewater treatment plants is quantified by the population equivalent. The population equivalent is defined by Article R2224-6 of the General Code of Local Authorities, as the organic biodegradable load having a five-day biochemical oxygen demand * (BOD5) of 60 g of oxygen per day.
Data inferred from other data using a sophisticated method to facilitate the understanding of what is observed (e.g. a collecting rate, the average yield of a wastewater treatment plant, etc). The goal is to make them usable for a given or understandable need for a specific audience (processed data can be an indicator).
Document prepared for the basin or group of basins and for the duration of a six-year management cycle (2010-2015, 2016-2021, 2022-2027, etc), which identifies the key measures to be implemented for achieving the objectives defined in the river basin management plan (SDAGE), including the environmental objectives of the
Area designated as requiring special protection under the European directives. A register is established on a river basin scale identifying various protected areas: vulnerable areas ("Nitrates" Directive), sensitive zones ("Urban Wastewater Treatment" Directive), areas designated under the "Habitats" Directive and "Birds" Directive as bathing areas, shellfish areas, categories of streams (Directive 78/659/EEC). The
Approach, planned by the Water Framework Directive (WFD), for the public involvement in its implementation process. For each basin or group of basins, it includes public consultations carried out over six months on: the timetable and work programme for the preparation or updating of the river basin management plan (SDAGE); the provisional summary of important issues, as well as the planned SDAGEs and
Group of local authorities established, at a watershed or a group of sub-watersheds scale, in order to facilitate the flood prevention, the defense against the sea, the management of water resources, and the preservation and management of wetlands. When a Sub-basin Management Plan has been set up, the Public river-basin territorial agency contributes to its monitoring and development. It ensures also the consistency of the management project of the Public water management and development agency.
Contract by which a corporate body under public law entrusts the management of a public utility for which it is responsible to a public or private operator, whose remuneration is substantially linked to the result of the utility operation. The delegatee may possibly be responsible for building structures or for purchasing properties necessary for the utility. The fundamental difference between a public market and a public service delegation results from the method of payment chosen. For a public market, payment is made by the public buyer. For a public service delegation, remuneration derives from the operation of the utility, done at the delegatee's own risk.
Group of local authorities in charge of the local management project and of the territorial water coordination, at the watershed scale. The Public water management and development agency has to ensure flood prevention as well as non-state-owned rivers management.
Municipal public utility in charge of conveying drinking water to the consumer's tap and collecting and treating wastewater and stormwater before returning them to the natural environment. The 30,000 French public water supply and sanitation services are also in charge of the relations with the consumer: information, demand management, billing, etc. The "drinking water supply" service includes the abstraction of water from the natural environment, its potabilization and supply. The "sanitation" service includes the collection, conveyance and treatment of wastewater and the disposal or reuse of sludge…
Domain consisting of rivers and lakes belonging to the State, local authorities or their groupings, and classified in their public domain fluvial. The delimitation of state watercourses is determined by decree in Council of State.