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Irrigation Efficiency

The percentage of water applied that can be accounted for in soil-moisture increase

Irrigation requirement

The quantity of water, exclusive of precipitation, that is required for crop production. It includes surface evaporation and other economically unavoidable wastes.

Irrigation return flow

Part of artificially applied water that is not consumed by plants or evaporation, and that eventually "returns" to an aquifer or surface water body, such as a lake or stream. Commonly used when discussing water conservation techniques and measurement.

Irrigation water management

Managing irrigation applications based on the water-holding capacity of the soil and the need of the crop. The water is applied at a rate and in such a manner that the crop can use it efficiently and resource losses are minimized. Irrigation efficiency is the ratio of the amount of water stored in the crop root zone compared to the amount of water applied. Water conservation has become more important as costs have risen and demands have grown for wildlife and urban uses.

Irrigation water use

Artificial application of water on lands to assist in the growing of crops and pastures or to maintain vegetative growth in recreational lands, such as parks and golf courses.

Irrigation, supplemental

See Supplemental irrigation.

Isobar

A line of equal barometric pressure on a weather map.

Isohyet

See Isohyetal line

Isohyetal line (isohyet)

A line drawn on a map or chart joining points that receive the same amount of precipitation.

Isotope

One of two or more variations of the same chemical element, differing in the number of neutrons not the number of protons.

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