International Journal of Ecology and Environmental Sciences

International Journal of Ecology and Environmental Sciences


International Journal of Ecology and Environmental Sciences
International Journal of Ecology and Environmental Sciences
2020, Vol. 2, Issue 3
Evaluation of drought characteristics in Tonk district, Rajasthan

Rishi Pathak, Gaurav Sharma, Lokesh Patel

Drought characteristics were evaluated in the Tonk district along with the impact of climate change in the region. Statistical analyses reveal that there w4 as changing trends in rainfall during the years for the period spanning 23 years (1983-2008). The average annual rainfall in the region varies between 527.76 mm in Malpura block to 618.70 mm in the Todaraisingh block. The average annual rainfall in district was 568.92 mm. The coefficient of variability for the district was 32%. In order to assess the impact of climate change and its effect in the rainfall pattern, the 1-day maximum rainfall was computed and it indicates that in most of the block there was decrease in 1-day maximum rainfall which is a cause of concern for water resources management. The number of rainy days has been evaluated and it was observed that the average number of rainy days varies between 29 to 31 days and on an average about 28 days of rainfall occur which contributes to the average annual rainfall of 568.92 mm. Departure analysis indicates that in 1985, 1987, 1989, 2002, and 2006 the region was under widespread drought condition and the worst drought condition occurs in 1987 and 2002. Based on the departure analysis, the average drought frequency was once in every 3–6 years. Based on probability analysis using Weibull’s plotting position formula block namely Todaraisingh, Tonk, Niwai and Malpura are drought-prone (Probability < 80 %) and facing regular water scarcity and droughts as compared to Uniara and Deoli which are not prone to droughts. Relative departure index (RDI) was computed in order to priorities block for immediate drought mitigation during its occurrences and it was evident that Malpura is at highest priority followed by Tonk and Todaraisingh
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