Index of drought and wet years using the percentage of normal (PNPI) and Nietzsche Semnan – JBES

DroughtSahar Ghafari, Rahim Rezaie, Esfandiar Jahantab

Range Management, Faculty of Natural Resources, University of Tehran, Karaj, Iran

Combat desertification, Faculty of Natural Resources, University of Esfahan, Esfahan, Iran

Young researchers club, Dehdasht branch, Islamic Azad University, Dehdasht, Iran

Key words: drought, wet, Percent of Normal Precipitation Index (PNPI) , Nietzsche and Semnan.


Hazards such as drought, which is affecting all aspects of life and the environment, so understanding the sources and across different environments, can be an important step in resource management. In this study the province’s rainfall, annual rainfall data for stations of Semnan, Shahrood, Damqan, Garmsar and Biarjmand, for calculation of wet and dry years were used for statistical analysis. California Drought Water SchoolThere are different indicators for quantifying drought phenomenon. Indicators used in this study measures the Percent of Normal Precipitation Index (PNPI) and Nietzsche Index . The findings lead to the precipitation and the frequency of wet years and drought conditions in the stations was studied. The overall results indicate that in both Nietzsche and PNPI all stations during the study period with normal conditions have been met. However, the frequency of occurrence in normal years Nietzsche’s approach is far more of PNPI.

jbes-vol4no6-p124-130Get the original articles in Source: Volume 4, Number 6, June 2014 – JBES

Journal Name: Journal of Biodiversity and Environmental Sciences (JBES)

Published By: International Network for Natural Sciences

Related Post: Evaluation of agricultural crops biodiversity in Iran: a case study in Kermanshah province during 2003–2012 — JBES

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