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Retention basin

Updated on 06/09/2018
Définition
Sens technique
A storm management basin for the temporary storage of runoff water to protect homes and structures during periods of heavy rain.
Source
according to the Intermunicipal Sanitation Syndicate of the Enghien-les-Bains region

Climatology

Updated on 04/12/2018
Définition
Sens commun
Study of the action of meteorological phenomena on different parts of the planet, of their mutual reactions, of their temporal evolution, and of different climates.
Source
according to the Robert dictionary

Pluviometry

Updated on 06/09/2018
Définition
Sens commun
Study of precipitations, their nature (rain, snow, soft hail, fog), their distribution and the techniques used for their measurement. Rainfall, with the distribution of Earth's temperature, conditions terrestrial climates, the nature and functioning of ecosystems and their primary productivity. It is one of the factors conditioning the development of human societies.
Source
according to Wikipedia

Stormwater drainage from waterproofed surfaces

Updated on 19/06/2018
Définition
Sens commun
All the techniques and facilities for controlling stormwater flow and water runoff by retention or infiltration or for taking care of the collection, possible storage and, if necessary, the stormwater and runoff-water treatment when the pollution they bring to the aquatic environment may seriously impair the effectiveness of sanitation systems. Indeed, rainwater by running off on waterproofed surfaces (roofs, roads, storage areas, etc), may carry pollutants (organic matters, heavy metals, hydrocarbons, etc).
Source
According to Rhine-Meuse Water Agency

Stormwater overflow

Updated on 19/06/2018
Définition
Sens commun

Runoff driving matters accumulated on waterproofed surfaces of a farm (loafing sheds/pens, herd crossing areas, manure storage areas, etc), when no arrangement is made to collect these flows.

Source
According to Rhine-Meuse Water Agency

Flood forecasting service

Updated on 13/07/2018
Définition
Sens technique
Service in charge of predicting hazardous situations caused by heavy floods, in partnership with Météo-France. The flood forecasting Service (SPC) warns the Prefect in case of alarm and prepares the information to be disseminated to the mayors. The Civil Protection Service of the prefecture is in turn responsible for alerting the mayors by suitable means and providing them with the information developed by the
Source
According to Rhine-Meuse Water Agency

Separate system

Updated on 13/07/2018
Définition
Sens commun
A sanitation system formed by two separate systems, one for wastewater and one for stormwater. This is a common system since the 1970s, only the wastewater system is connected to the treatment plant, the stormwater system usually discharging its waters into a watercourse.
Source
According to the Ministry for the Environment and AFB

Average annual rainfall

Updated on 19/06/2018
Définition
Sens commun
Average rainfall over a year: it is obtained mostly by adding the average daily rainfalls of the year and dividing the result by the number of days in the year.
Source
According to AFB

Runoff water

Updated on 19/06/2018
Définition
Sens commun
Rainwater flowing on the ground.
Source
According to BRGM

Separated collecting

Updated on 19/06/2018
Définition
Sens technique

Collecting of separated domestic sewage in a system and stormwater in another. Separated collection has the advantage of avoiding the risk of sewage overflow into the environment when it rains. It allows better control of the pollution flow and concentration and better adapting the capacity of the wastewater treatment plants.

Source
According to Poitou-Charentes Regional Council

Combined sewer system

Updated on 13/07/2018
Définition
Sens commun
System discharging domestic wastewater and stormwater into the same sewers. The combined network adds the economic advantage (a sole system to build and manage) to simplicity (any connection error is excluded by definition), but requires the taking into account of abrupt changes in the flow of rainwater when designing and sizing collectors and treatment facilities.
Source
According to IOWater

Acid rain

Updated on 13/07/2018
Définition
Sens technique
Anthropogenic air pollutant which is dissolving in moist air and falling back in a liquid or solid form on plants, soils, water and minerals. It is called acid when its pH is less than 5.6. The main sources of these pollutants are: industry, thermal power stations, domestic heating and cars emitting sulphur dioxide and nitrogen oxides.
Source
According to Ifremer

Precipitation

Updated on 19/06/2018
Définition
Sens commun
Total volume of atmospheric precipitation, whether in the solid or liquid state (rain, snow, hail, fog, frost, dew, etc), usually measured by meteorological or hydrological institutes.
Source
According to Eurostat

Water abstraction

Updated on 25/02/2019
Définition
Sens commun

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).

Source
according to AFB, IOWater, SOeS and OCDE

Abstraction supply zones

Updated on 25/02/2019
Définition
Sens technique

Area on which the water that soaks into the ground supplies the abstraction for drinking water.

Source
According to the Ministry for the Environment and the Ministry for the Agriculture

Flood warning

Updated on 08/04/2020
Définition
Sens commun

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.

Source
according to OFB
Sens technique

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.

Source
According to Ministry of the Environment and OFB

Hydrological balance

Updated on 06/09/2018
Définition
Sens technique
Accounting of the changes in water resources (stream flows, groundwater level, effective rainfall) of an area (for example a catchment area) based on meteorological, piezometric or hydrological information.
Source
according to AFB

Hydropower plant

Updated on 04/12/2018
Définition
Sens commun
Facility that produces electricity by the force of moving water.
Source
according to AFB
Sens technique
Hydroelectric facility transforming hydraulic energy into electricity, whose power usually varies from a few kW to 4,500 kW.
Source
according to IFREMER

Dam release

Updated on 06/09/2018
Définition
Sens technique
Operation to lower water level and increase outflow rates to discharge some of the sediment retained by a dam. A dam release consists in opening the gates, thus limiting the silting of the dam reservoir and the risk of flooding. This operation, although common in the management of harnessed rivers, can have adverse effects on the downstream environment (decrease of oxygen levels in water, obstruction of fish gills by suspended solids, etc.).
Source
according to ISTREA

Stagnant water

Updated on 06/09/2018
Définition
Sens commun
Still water in parts of a river, lake or other aquatic environment.
Source
according to UNESCO

Green water

Updated on 06/09/2018
Définition
Sens commun
Water contained in the soil and available for plants.
Source
according to AFB

Groundwater/river exchange

Updated on 06/09/2018
Définition
Sens commun
Exchange of water in one direction or the other between an aquifer and a river. Depending on the level of the water line, and on the season, groundwater feeds the river or is fed by it, particularly during floods. In the case of karst, these relationships are important and localised.
Source
according to AFB

Silting

Updated on 06/09/2018
Définition
Sens technique
Deposit of fine sediments made of rock particles and silt or clay. Siltation is a form of sedimentation with mud. Streams carry a few million cubic meters of sediment each year. Their deposit causes the silting of these rivers, canals, and bodies of water. This quite natural phenomenon is accentuated by a flat topography, low flows, erosion processes, as well as industrial and urban discharges.
Source
according to AFB and INRA

Snow melt

Updated on 06/09/2018
Définition
Sens commun
Transformation of snow into liquid water.
Source
according to UNESCO

Hydraulics

Updated on 06/09/2018
Définition
Sens commun
A branch of fluid mechanics that deals with the flow of water (or other liquids) through pipes, open channels and other structures.
Source
according to UNESCO