Analysis of drought effect on annual stream flows of river Malewa in the lake Naivasha basin, Kenya
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Date
2014-09-15Author
Kyambia, Marshal M.
Mutua, Benedict M.
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The main parameters of drought phenomenon are the longest duration and largest severity for a desired return period. These
parameters form the basis for designing water storage structures to cope with drought effects. In this study, these drought parameters were estimated using the probability based theory. The sample estimates of the mean, coefficient of variation, skewness, correlation and information on the probability distribution of flow sequence, were used as the basic input parameters. The
truncation level was considered at mean level of the annual flow sequences of River Malewa in Lake Naivasha basin. In this
basin, 100, 50, 10, 5 and 2-year droughts may persist continuously for 6, 4, 3, 2 and 1 years respectively. From the probabilistic
approach for a normal probability distribution function, high values of coefficient of variation resulted in high values of the actual
severity. The results show that there is drought severity in Lake Naivasha basin especially in parts experiencing high inter-annual
variability in annual flow regimes.
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