Flood Frequency Analysis for Greater – ZAB River

Abstract

The analysis of flood discharge for greater - Zab river have been conducted using different statistical models such models are , “ log – normal type III , Pearson type III , log – Pearson type III and Gumbel distributions “ . the models were applied to annual flood series for Greater - Zab River at Eski - Kelek . The magnitudes of flood computed for different return periods . The models were compared using statistical measures such as root mean square error , bias , and standard error .The goodness of fits of all these models was evaluated using the test of Chi-Square. According to this test the log – normal type III could be regarded as the best for flood series for this river . Its useful to determine the relation ships between the flood magnitude versus return period .