A Case Study on the Estimation of Flood Flows in Rivers with Different Methods

Abstract

The estimation of the flood discharges of the rivers that do not have streamflow measurements is one of the important issues in hydraulic engineering. For the safety of the structures to be built on these rivers, it is necessary to accurately estimate the possible flood discharges for some periods. Many methods have been developed in the literature on this subject. The methods developed depending on the catchment and rainfall characteristics, it is possible to make accurate estimations about the catchment without flow measurement. In this study, an evaluation was made on the estimation success of the methods by trying to determine the flood discharges of a river with indirect and direct methods based on rainfall. Compared rainfall-runoff estimation methods shows Synthetic method is least reliable one among all other estimations. On the other hand, Mockus emerges as the most consistent one through the all evaluated peak flow discharges methods. This study is also intended to be a guide for those who work on the subject.