2019. Spatio-temporal characterization of Agricultural Drought using Soil Moisture Deficit Index (SMDI) in the Upper Tana River basin, Kenya. International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) . 5, 2 (Feb. 2019), 93–106. DOI:https://doi.org/10.31695/IJERAT.2019.3388.