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Use of SPI and Rainfall Deciles for Drought Assessment

Author(s):

Inayat Shah , Water Resources Engineering & Management Institute,Faculty of Technology & Engineering, The Maharaja Sayajirao University of Baroda; Dr. T. M. V. Suryanarayana, Water Resources Engineering & Management Institute,Faculty of Technology & Engineering, The Maharaja Sayajirao University of Baroda; Dr. F. P. Parekh, Water Resources Engineering & Management Institute,Faculty of Technology & Engineering, The Maharaja Sayajirao University of Baroda

Keywords:

Drin C, Drought assessment, Rainfall deciles, Standardized Precipitation Index, Trend analysis

Abstract

Drought assessment is very important to manage water resources in lean period. It plays vital role in managing water demands specially in agriculture sector. Present approach for assessment of drought is accomplished by use of Standardized Precipitation Index (SPI) and Rainfall deciles, which are fully based on monthly rainfall data. Presently Drin C (Drought indices calculator) is used for determining SPI and Rainfall deciles. SPI has been proposed to monitor dryness and wetness on multiple time scales (McKee, 1993). Standardized Precipitation Index (SPI) and Rainfall deciles are used to assess the drought in Khedbrahma region of Gujarat. Monthly rainfall data for the years 1968 to 2010 is considered. SPI 3, SPI 4, SPI 5 and SPI 6 values are determined and analysis is carried out for the slope of the trendline for drought condition. Rainfall deciles are used to check the severity of drought. In present approach SPI 3, SPI 4, SPI 5 and SPI 6 values are determined for 4 decades, i.e. 1970 to 1979, 1980 to 1989, 1990 to 1999 and 2000 to 2009. The trendline for each decade are analysed and the Severity of drought are assessed for each decade.

Other Details

Paper ID: IJSRDV5I21274
Published in: Volume : 5, Issue : 2
Publication Date: 01/05/2017
Page(s): 1378-1382

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