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UNREGULATED SOURCE [5 records]

Record 1 2004-06-01

English

Subject field(s)
  • Hydrology and Hydrography
  • Speleology
DEF

That portion of the runoff which has infiltrated the groundwater system, and has later been discharged into a stream channel as spring or seepage water. Groundwater runoff is the principal source of base or dry-weather flow of streams unregulated by surface storage, and such flow is sometimes called groundwater flow.

Key term(s)
  • underground water flow
  • ground water runoff
  • ground water run-off
  • ground water flow
  • groundwater run-off

French

Domaine(s)
  • Hydrologie et hydrographie
  • Spéléologie
DEF

Partie du ruissellement qui s'est infiltrée dans le sol, a atteint la nappe phréatique et a rejoint un cours d'eau comme eau de source ou de suintement.

Spanish

Campo(s) temático(s)
  • Hidrología e hidrografía
  • Espeleología
DEF

Escorrentía por corrientes que van bajo la superficie del suelo.

Save record 1

Record 2 2004-03-04

English

Subject field(s)
  • Environmental Studies and Analyses
  • Exhaust Systems (Motor Vehicles)
CONT

Constant Volume Sampler(CVS). Motor vehicle exhaust is a complex mixture of unburned fuel, combustion products(including a high water vapor content), and intake air that exits the tail pipe at high temperatures. In simulated driving conditions on the dynamometer, the volume of the exhaust emitted from the tail pipe is continually changing depending on where in the driving cycle the vehicle is(for example, during acceleration, during deceleration, at constant speed, or at idle). To quantitatively determine emission rates from vehicles, we use a constant volume sampling system, which maintains a constant total flow rate of vehicle exhaust plus dilution air. With a CVS system, as exhaust flow increases, such as during heavy acceleration, the dilution air is automatically decreased and the sampling source is representative of exhaust variations. This CVS system provides the source for all exhaust samples collected(regulated and unregulated). Because some compounds present in the exhaust are soluble in water, quantitative transfer requires that the diluted exhaust be maintained above its dew point by providing sufficient dilution air through the CVS. In addition, sampling components, such as the raw exhaust transfer duct and sample lines, must be heated to prevent water condensation.

French

Domaine(s)
  • Études et analyses environnementales
  • Échappement (Véhicules automobiles)
CONT

Le système de prélèvement à volume constant à pompe volumétrique (PDP-CVS) satisfait aux conditions formulées dans la présente annexe en déterminant le débit de gaz passant par la pompe à température et pression constantes. Pour mesurer le volume total, on compte le nombre de tours accomplis par la pompe volumétrique, qui est étalonnée. On obtient l'échantillon proportionnel en opérant un prélèvement à débit constant, au moyen d'une pompe, d'un débitmètre et d'une vanne de réglage du débit.

CONT

[...] début de la mesure de la quantité de gaz d'échappement dilués (échantillon à volume constant ou CVS) ainsi que des températures et pressions requises. [...] Le système CVS est étalonné à l'aide d'un débitmètre de précision conforme à des normes nationales ou internationales et d'un dispositif d'étranglement. Le débit qui traverse le système est mesuré pour différents réglages de l'étrangleur et les paramètres de commande et contrôle du système sont mesurés et mis en relation avec le débit. [...] La précision totale du système de prélèvement CVS et du système d'analyse est déterminée en introduisant une masse connue d'un gaz polluant dans le système utilisé normalement.

Spanish

Save record 2

Record 3 2003-09-19

English

Subject field(s)
  • Scientific Research Equipment
  • Environmental Studies and Analyses
  • Air Pollution
  • Exhaust Systems (Motor Vehicles)
CONT

Motor vehicle exhaust is a complex mixture of unburned fuel, combustion products(including a high water vapor content), and intake air that exits the tail pipe at high temperatures. In simulated driving conditions on the dynamometer, the volume of the exhaust emitted from the tail pipe is continually changing depending on where in the driving cycle the vehicle is(for example, during acceleration, during deceleration, at constant speed, or at idle). To quantitatively determine emission rates from vehicles, we use a constant volume sampling system, which maintains a constant total flow rate of vehicle exhaust plus dilution air. With a CVS system, as exhaust flow increases, such as during heavy acceleration, the dilution air is automatically decreased and the sampling source is representative of exhaust variations. This CVS system provides the source for all exhaust samples collected(regulated and unregulated).

Key term(s)
  • constant-volume sampling system
  • constant-volume sampler

French

Domaine(s)
  • Matériel et équipement (Recherche scientifique)
  • Études et analyses environnementales
  • Pollution de l'air
  • Échappement (Véhicules automobiles)

Spanish

Save record 3

Record 4 1994-03-01

English

Subject field(s)
  • Air Pollution
  • Environmental Law
  • Environmental Economics
CONT

The introduction of the trading program(or other regulatory measures) need not be delayed until the complete inventory is available and the permit system in place. Trading can begin provided that trades are restricted to permitted sources and that before any unpermitted or uncontrolled source is allowed to be traded, an appropriate baseline is defined for that source. The trading program can be used to draw unregulated sources into the control program.

French

Domaine(s)
  • Pollution de l'air
  • Droit environnemental
  • Économie environnementale
DEF

Source qui échappe à la réglementation environnementale ou qui refuse de s'y soumettre.

OBS

sauvage : se dit de ce qui s'organise en général spontanément en dehors des lois et règlements.

OBS

Le terme «uncontrolled» peut aussi signifier spécifiquement, ce qui est fréquent, «non équipé d'un dispositif antipollution», bien que la réglementation puisse avoir des exigences autres qu'un dispositif antipollution. Le terme anglais «uncontrolled» signifie aussi «qui ne tient pas compte de la réglementation»; ainsi, dans certains inventaires d'émissions, on calcule séparément les émissions brutes, c'est-à-dire sans tenir compte du dispositif antipollution utilisé (uncontrolled emission), et les émissions après épuration (controlled emissions).

Spanish

Save record 4

Record 5 1994-03-01

English

Subject field(s)
  • Air Pollution
  • Environmental Law
  • Environmental Economics
CONT

The introduction of the trading program(or other regulatory measures) need not be delayed until the complete inventory is available and the permit system in place. Trading can begin, provided that trades are restricted to permitted sources and that before any unpermitted or uncontrolled source is allowed to be traded, an appropriate baseline is defined for that source. The trading program can be used to draw unregulated sources into the control program.

CONT

In the case of air quality, for example, mobile sources - cars and trucks - and unregulated minor sources produce emissions that could be reduced. In the case of water quality there are numerous nonpoint sources.

French

Domaine(s)
  • Pollution de l'air
  • Droit environnemental
  • Économie environnementale
DEF

Source qui n'est soumise à aucune réglementation environnementale particulière.

Spanish

Save record 5

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