Figure 1 Upper Awash basin location map
Method
Climate change and water resource fluctuation are inseparable natural events. Whether it is a quantifiable or unquantifiable change in these events might result in hydroclimate change and it could devastate socio-economy. To assess and evaluate the existing long-term climate change effect in Upper Awash basin water resource fluctuation, climate and streamflow data are subjected to topographic traced hydroclimate statistical trend analysis. To evaluate the hydroclimate trend of the basin, Mann Kendall and modified Mann Kendall’s trend analysis with Sen’s slope estimator is used. The Mann Kendall and modified Mann Kendall’s trend evaluation is based on the data autocorrelation.
Data
The upper Awash basin hydroclimate trend analysis for the 1991 - 2015 time series or basin’s 25 years periodical hydroclimate elements precipitation, temperature, and streamflow are subjected to statistical trend evaluation. The climate data of more than 15 stations within the basin are collected from Ethiopian National Meteorological Agency (NMA) and based on data consistency eleven stations (Table 1) are subjected to trend analyses.