Abstract
A drought is an event where there has been an extreme decrease in the number of water sources. Drought is also a natural disaster caused by a reduction in the amount and frequency of precipitation. When the El-Nino events the reservoir storage decreases until dead storage capacity, so the reservoir is unable to provide water to supply irrigation areas so the irrigation area becomes dry and unable to produce. The extent of drought in irrigated areas varies greatly depending on the severity of the drought. The drought index value uses the Flow Duration Curve (FDC) by determining the reservoir reliability value. The stages carried out in the research were identifying the irrigation service area of the reservoir regarding the area of irrigation area, cropping patterns, planting season, and collecting data on the area of irrigation production and production failure at the time of El-Nino events. The results showed that each El-Nino volume deficit from the reservoir almost reached 50% of the normal reservoir water volume. The distribution of the worst drought in the reservoir service irrigation area occurred during planting season II and planting season III. Nearly 80% of the irrigation area covered is 2252 Hectare of all irrigation area covering an area of 2815 Hectare.