Analysis of Meterological Drought for Ajmer and Bikaner District of Rajasthan

Abstract

Drought is an insidious hazard and is a protracted period of deficient precipitation resulting in extensive damage to crops, resulting in loss of yield and its impact vary from region to region. It conditions result from a lack of precipitation and can worsen after prolonged periods of no rainfall, especially in areas where the water supply is short. The main objective of the research to develop an approach and analyses of meteorological droughts based on precipitation data. If the mean weekly rainfall for 30 years of data from 1987 to 2016, then a week receiving rainfall less than 75 per cent of mean weekly rainfall is defined as drought week and greater than 125 per cent of mean weekly rainfall is defined as the surplus week. Week having rainfall between 75 per cent of mean weekly rainfall and 125 per cent of mean weekly rainfall is considered as the normal week. Rainfall Variability is the availability of water at a particular time and area. In this study, 30 years (1991-2016) of rainfall data of Ajmer and Bikaner district have been analyzed on yearly, monthly and weekly basis for predicting the water drought, normal and surplus event for crop planning in the region. Weekly drought, normal and surplus events give a more precise idea about crop planning than yearly and monthly events. The analysis has revealed that the percentage of drought weeks and months are more than normal and surplus weeks for both districts (Ajmer and Bikaner). So 1987that there is a need of supplemental irrigation during the periods of water scarcity.