Analysis of Hydrological Drought on Kurdistan Province

Hydrological drought was analyzed by method of truncation level in 4 main hydrometry stations from Kurdistan province west of Iran. The data were daily discharges. The flow duration curves (FDC) were derivate base on daily flow time series then 70 % truncation level was determined and drought periods were assigned. Frequency analysis was carried out for annual maximum series (AMS) of drought deficit volume and duration series. The maximum liklihood method (ML) was applied to determine model parameters. The average of drought duration and drought deficit volume was 76 days and 17.7 MCM respectively. The Johnson, Pearson and Double Exponential distributions were the better ones for deficit volume and duration analysis. The average of return periods of drought was 4 year almost.

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