Deciles (Drought Index) The deciles drought index system is based on a relative frequency distribution of long- term precipitation divided into tenths of the overall range of distribution. Each tenth division or precipitation category is termed a “decile” and ranges from the lowest (drought) ten percentile of precipitation levels to the highest (wet) ten percentile. By definition, the fifth decile is the median (middle-most) and is the precipitation amount not exceeded by 50 percent of the occurrences over the period of record. One disadvantage of the deciles drought index system is that a long climatological record is required for accurate deciles classifications. As a drought index, the deciles are grouped into five classifications as follows: deciles 1-2 (lowest 20%) – much below normal deciles 3-4 (next lowest 20%) – below normal deciles 5-6 (middle 20%) – near normal deciles 7-8 (next highest 20%) – above normal deciles 9-10 (highest 20%) – much above normal Also see Drought Indexes (Indices).
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
Web site to visit: http://www.state.nv.us/cnr/ndwp/home.htm
Author of the Water Words Dictionary source of text: Gary A. Horton
If you are the author of the text above and you not agree to share your knowledge for teaching, research, scholarship (for fair use as indicated in the United States copyrigh low) please send us an e-mail and we will remove your text quickly. Fair use is a limitation and exception to the exclusive right granted by copyright law to the author of a creative work. In United States copyright law, fair use is a doctrine that permits limited use of copyrighted material without acquiring permission from the rights holders. Examples of fair use include commentary, search engines, criticism, news reporting, research, teaching, library archiving and scholarship. It provides for the legal, unlicensed citation or incorporation of copyrighted material in another author's work under a four-factor balancing test. (source: http://en.wikipedia.org/wiki/Fair_use)
The information of medicine and health contained in the site are of a general nature and purpose which is purely informative and for this reason may not replace in any case, the council of a doctor or a qualified entity legally to the profession.
The following texts are the property of their respective authors and we thank them for giving us the opportunity to share for free to students, teachers and users of the Web their texts will used only for illustrative educational and scientific purposes only.
All the information in our site are given for nonprofit educational purposes
The information of medicine and health contained in the site are of a general nature and purpose which is purely informative and for this reason may not replace in any case, the council of a doctor or a qualified entity legally to the profession.
www.riassuntini.com