Figure 7. Spatial distribution of Mann-Kendall drought trend test at (a) 90% and (b) 95% significant levels for the upper Tana River basin

From

Spatio-temporal Drought Characterization for the Upper Tana River Basin, Kenya Using Standardized Precipitation Index (SPI)

Raphael M. Wambua, Benedict M. Mutua, James M. Raude

World Journal of Environmental Engineering. 2015, 3(4), 111-120 doi:10.12691/wjee-3-4-2