KHOSRAVI,H , , Eskandari Dameneh,H , , Eskandari Dameneh,H , , Borji,M , and Nakhaee Nejadfard,S . "Drought Trend Assessment in Riverheads of Karkheh and Dez Basins based on Streamflow Drought Index (SDI)", Desert Ecosystem Engineering Journal, 1, 2, 2018, 45-54. doi: 10.22052/jdee.2018.101087.1019