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In this study, the hydrological drought index was calculated using Modified Water Supply Index (MSWSI). The quantified value corresponding to MSWSI -1 was estimated from the relationship between drought index and input factor. The target area was the 3006 basin where precipitation, river flow, and dam inflow have been recorded for 21 years (January 1997 to August 2017). The drought index was estimated over two time intervals, one month and three months moving average. The quantitative values were estimated for each month and for each input data using a linear regression equation. The monthly MSWSI showed considerable variability between the drought and wet conditions. And also the coefficient of determination between drought index and each input data revealed no correlation. To improve the coefficient of determination and to derive the appropriate linear regression constants, the ranking by each factor and the rank difference between MSWSI drought index and each input factor were calculated. The applied rank difference was estimated to be within 15% and 30%. Re-quantifying the available water resources is expected to be useful in preparing water use policy.

Estimating Quantified Hydrological Input Value for Hydrological Drought