A Probabilistic Model for Flooding Downstream of the Junction of Two Rivers

Flood frequency analysis downstream of the junction of two rivers, when flood information is available upstream of the confluence is the main subject of this paper. For this purpose, it is assumed that the joint distribution function of the floods at two upstream gaging stations follows a bivariate extreme value distribution. The distribution at the junction is obtained by the sum of two random variables. The model is applied successfully to an actual case study.