GLOSSARY

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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Many analyses reported in ISciences-authored blog posts are based on data generated by the ISciences Water Security Indicator Model (WSIM). Other sources, if used, are referenced in footnotes accompanying individual posts. WSIM is a validated capability that produces monthly reports on current and forecast global freshwater surpluses and deficits with lead times of 1-9 months at 0.25°x0.25° resolution. This capability has been in continuous operation since April 2011 and has proven to provide reliable forecasts of emerging water security concerns in that time-frame. WSIM has the ability to assess the impacts of water anomalies on people, agriculture, and electricity generation. Detailed data, customized visualizations, and reports are available for purchase.

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