1. Ahmad AA, Yusof F, Mispan MR, Kamaruddin H (2017) Rainfall, evapotranspiration and rainfall deficit trend in Alor Setar, Malaysia. Desalin Water Treat 13:400–404
2. Ahmed K, Shahid S, Harun SB, Wang X-J (2016) Characterization of seasonal droughts in Balochistan Province, Pakistan. Stoch Env Res Risk Assess 30:747–762
3. Al-Ansari N, Adamo N, Sissakian V, Knutsson S, Laue J (2018) Water resources of the Tigris River catchment. J Earth Sci Geotech Eng 8:21–42
4. Al-Hasani AA (2021) Trend analysis and abrupt change detection of streamflow variations in the lower Tigris River Basin, Iraq. Int J River Basin Manag 19:523–534
5. Allen RG, Pereira LS, Raes D, Smith M (1998) Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. Fao, Rome 300(9):D05109