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- W2525634580 abstract "The conventional way of flood frequency analysis is applied in determining flood magnitudes of defined return periods by selecting theoretically the best fit probability distributions. The most important part of the distribution is the tail as far as extreme flooding phenomena are utmost concern in water resources development and management. In most cases the central part of the theoretical distribution fits satisfactorily with the empirical points. In FFA, the objective is to estimate flood magnitude (Q) corresponding to any specified recurrent interval of (T) years. The estimation is complicated due to lack of a physical basis for determining the form of the underlying flood frequency distribution and the necessity of evaluating flood event for return periods that exceed the observation period. In order to improve the estimation of the Q-T relationship, the need to use regional information arises so that stabilizing site specific estimates based on limited data can be handled and as well as ungauged catchments. The regional FFA procedure involves the definition and identification of homogeneous regions .In the present frequency analysis, application of index-flood regional method of FFA is considered as one of the tools in overcoming problems of ungauged catchments and streams having small sizes of observation (n). For this purpose as part of FRIEND/Nile research activities, the upper sub-basin of Awash River with 8 gauged streams consisting of stream flow records varying from 15 to 33 years has been analyzed. An extreme value distribution (EV1) is elected as the best fit distribution for the sub-basin and this is also exhibited by other similar analysis in the Nile basin countries (Kenya, Tanzania and the Sudan). Regionalization is the generally accepted term to explain the transfer of information about flood peaks at one catchment derived from other catchments with similar characteristics. The advantage of such procedures is particularly great in the estimation of frequencies for higher flood magnitudes with limited at site data do exist and inference in the tails of probability" @default.
- W2525634580 created "2016-10-07" @default.
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- W2525634580 date "2005-11-01" @default.
- W2525634580 modified "2023-09-27" @default.
- W2525634580 title "At-site and regional flood frequency analysis of the upper Awash sub-basin in the Ethiopian Plateau" @default.
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