Test of Homogeneity, frequency analysis of rainfall data and estimate of drought probabilities in Dire Dawa, Eastern Ethiopia.
1999
Ketema Tilahun
Ethiopian agriculture is almost totally dependent or rainfall. But this rainfall varies from year to year and is not dependable. Frequency analysis has been used to determine rainfall amounts for different return period for Dire Dawa using data covering the period 1979-98. A computer software RAINBOW was used. The rainfall data has been tested for homogeneity at different significance levels. It is found to be generally homogeneous. Different plotting position formulas have been compared. Frequency analysis of rainfall data has been done for three seasons i.e. belg kiremt, and bega, for various return periods and exceedence levels using Weibul plotting position and normal distribution. There is a high probability of failure of belg seasonal rainfall than that of Kiremt. Drought probability in the region is estimated to be 25%.
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This bibliographic record has been provided by Ethiopian Institute of Agricultural Research