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

Year 2023, Volume: 7 Issue: 1, 46 - 70, 24.05.2023

Mehmet Cihan Aydın , Ali Emre Ulu

https://doi.org/10.31807/tjwsm.1202174

Abstract

The estimation of the flood discharges of 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 on this subject. With the methods developed based 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 flowing through a 336 km2 catchment area with indirect and direct methods based on rainfall. Compared rainfall-runoff estimation methods showed that Synthetic Method was the least reliable one among all other estimations. On the other hand, with the discharges of Q10 = 77 m3/s, Q100 = 193 m3/s and Q500 = 273 m3/s, Mockus emerged as the most consistent one through all evaluated peak flow discharges methods. It is also intended that this study will be a guide for those who work on the subject.

Keywords

flood discharge estimation, rainfall-runoff relationship, runoff estimations, probability distributions

Thanks

We thank “ACR Planning Consultancy Company” for their support and contributions to the study.

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