“…Surendran et al [26] used Drought Indices Calculator (DrinC) software that calculates the drought indices such as Standard Precipitation Index, Reconnaissance Drought Index, and Streamflow Drought Index by providing an interface for the district of Madurai located in the semi-arid climatic zone of India. Awasthi et al [27] developed a calculator to prepare a water budget of any discrete land unit such as agriculture and livestock using C language. The calculator estimated the water deficiency or surpluses of the land use.…”