Flood Discharge Using Creager Graph Based on DAM Data in Jeneberang River Region

Abstract:

For engineers who are involved in planning and constructing water structures, hydrology is indispensable data. In planning in the field of water resources, especially water structures, it is often necessary to have flood discharge data that are close to real field conditions so that a building that is able to control flood discharge can be planned. There are many models that can be used as references, but doubts often arise in their application in Indonesia, which has a tropical climate. So, we need a calibration model which is an approach to the actual flood discharge in the field. One of the calibration models for river flood discharge is the Creager graph method which is compiled based on Q1000 data of dams spread over the Jeneberang River Region. The purpose of this study is to determine the C value of the Creager graph based on Q1000 dams spread over the Jeneberang River Region, which can later be used in determining the flood discharge method selected for the unmeasured watershed included in the Jeneberang River Region. The results showed that the value of the Creager Coefficient (C) for the Jeneberang River Region based on the technical data of the dam was obtained 38. Based on the value of C which was tested in 4 watersheds, it was found that the selected flood discharge in the Tallo Watershed, is ITB-II SUH and in the Kelara Watershed, Tangka Watershed and Sinjai Watershed, is SCS SUH with a large deviation of 4.05% - 8.66%.

• Periodical: Engineering Headway (Volume 23)
• Pages: 83-89
• DOI: https://doi.org/10.4028/p-NWRz8a
• Online since: July 2025
• Authors: Muhammad Rifaldi Mustamin*, Farouk Maricar, Rita Tahir Lopa, Riswal Karamma
• Keywords: Creager Graph, Flood Discharge, Hydrology

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