ABSTRACT
In water resource development, the availability of sufficient historical time series data is an important aspect of flood frequency analysis (FFA). From the statistical point of view, estimation from small samples may give unreasonable or physically unrealistic parameter estimates, especially for distributions with a large number of parameters (three or more) (Rao and Hamed, 2000). Practically, however, in most part of the globe, observation data are limited, especially in developing countries, such as Ethiopia, or in some cases unavailable, such as in remote regions. In such cases, the estimation of design parameters for hydraulic structures, roads, and similar projects may suffer from under-or overestimation of the parameter values. Therefore, for the estimation of design floods in regions where little or no data are available,
13.1 Introduction ................................................................................................. 233 13.2 Description the Study Region and Methodology ........................................ 235
13.2.1 The Blue Nile River Basin ............................................................. 235 13.2.2 Research Methodology .................................................................. 236
13.3 Simulated and Observed Flow Quantiles .................................................... 238 13.4 Conclusion ................................................................................................... 243 References .............................................................................................................. 243
developing regional flood frequency curves is the best solution to overcome the problem (Gebeyehu, 1989; Rosbjerg and Madsen, 1995). This analysis is often supported through a regionalization procedure to convey information from gauged to ungauged location (Gebregiorgis et al., 2012).
