Browsing by Author "Mackie, Allieu"

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    Investigation of stream flow characteristics of the Wami-Ruvu basin.
    (University of Dar es Salaam, 1998) Mackie, Allieu
    Regionalization was introduced into hydrology in the near past. Heterogeneity among sites in the region, use of historical data and correlation between sites in a region are the limitations of this concept. This study tries to minimize their effects and assesses the significance of some of the limitations. The Wami-Ruvu basin was delineated into homogeneous regions for hydrological in studies. In order to achieve this objective physiographic; climatic and drainage characteristics were used to preliminarily identify homogeneous regions. Using statistics obtained from available annual maximum series and 10-day annual minimum series, these regions were tested for homogeneity. The tests were mainly based on regional weighted average L-moments. Based on this study 4 regions were obtained for Flood Frequency Analysis and 3 regions were obtained for Low Flow Frequency Analysis. Before starting the analysis, the data were checked for temporal and spatial independence. A procedure based on descriptive and predictive ability tests, adopted for selecting a suitable flood frequency model with the corresponding method of parameter estimation described. Storage required to augment low flows were also computed for varying demands expressed as a percentage of the mean flow at different probabilities of failure.