This glossary provides definitions of important terms used in the descriptions of ISciences' capabilities and products.

Deficits are declared when surface water levels fall below historical averages. [see return period]. Sustained deficits may become droughts, which are defined as persistent, abnormal deficits that have an adverse impact on vegetation, animals, or people [National Drought Policy Commission Report, May 2000). Deficits are specified in five levels, each of which corresponds to a range of return periods (see Anomaly Levels).

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