A sample of result of the risk analysis for the longest duration, most intense or sever
droughts for 20 years return period, and the corresponding probability of occurrence for
various risk values were calculated and presented in Table 1. Risk maps of the longest
durations and most sever droughts for 20 years return periods are given in Figures (3) and
(4). As it is observed, the amount of risk for the longest drought duration is more in north,
west and south-east regions.