Pesticides

Pesticides

Any chemical or substance used to kill or inhibit the growth of pests that damage or interfere with the growth of crops, shrubs, tress, timber and other vegetation useful to humans.

Industry: Agricultural chemicals

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Pesticides

water-source heat pump

Agricultural chemicals; Pesticides

Heat pump that uses wells or heat exchangers to transfer heat from water to the inside of a building. Most such units use ground water. (See: groundsource heat pump; heat pump.)

waterborne disease outbreak

Agricultural chemicals; Pesticides

The significant occurence of acute illness associated with drinking water from a public water system that is deficient in treatment, as determined by appropriate local or state agencies.

watershed

Agricultural chemicals; Pesticides

The land area that drains into a stream; the watershed for a major river may encompass a number of smaller watersheds that ultimately combine at a common point.

A coordinated framework for environmental management that focuses public and private efforts on the highest priority problems within hydrologically-defined geographic areas taking into consideration ...

watershed area

Agricultural chemicals; Pesticides

A topographic area within a line drawn connecting the highest points uphill of a drinking waterintake into which overland flow drains.

weight of scientific evidence

Agricultural chemicals; Pesticides

Considerations in assessing the interpretation of published information about toxicity--quality of testing methods, size and power of study design, consistency of results across studies, and ...

weir

Agricultural chemicals; Pesticides

1. A wall or plate placed in an open channel to measure the flow of water. 2. A wall or obstruction used to control flow from settling tanks and clarifiers to ensure a uniform flow rate and avoid ...