Flood Hazard Assessment in Kalinyamatan District Generated by Dam Break of Bakalan Dam in Jepara Regency

Tania Sinayangsih; Eka Oktariyanto Nugroho; Agung Wiyono Hadi Soeharno

Tania Sinayangsih Magister Study Program of Water Resources Management, Civil Engineering Study Program, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Bandung 40135, Indonesia
Eka Oktariyanto Nugroho Magister Study Program of Water Resources Management, Civil Engineering Study Program, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Bandung 40135, Indonesia
Agung Wiyono Hadi Soeharno Water Resources Engineering Research Group, Civil Engineering Study Program, Faculty of Civil Engineering and Environmental, Bandung Institute of Technology, Bandung 40135, Indonesia

Keywords: Dam Break Analysis, Dam, Risk Map, Overtopping, HEC-RAS, Hazard Map, Vulnerability Map, Capacity Map, Jepara

Abstract

Bakalan Dam is one of the dams planned to be built on the Bakalan River, Jepara Regency. This dam is designed to meet the needs of raw water, irrigation needs also flood control. Bakalan Dam not only has great benefits in controlling floods, and meeting raw water and irrigation needs, but also harbors potential hazards. With a height of up to 87 meters due to being built between extreme slopes, if the dam collapses, it can cause large losses of life and material loss. The collapse of this dam can be caused by overtopping, where water with a large discharge can no longer be flowed by the spillway, and flows over the top of the dam. The analysis was carried out using HEC RAS 2D and GIS, it is shown that Kalinyamatan District will be the one heavily affected by the collapse of Bakalan Dam. Through HEC RAS 2D, author can also determine the risk of flood inundation, speed of arrival of water, and arrival time of water in the affected area. Therefore, to avoid casualties, a map of the potential risk for dam collapse due to overtopping is planned. It is hoped with risk mapping, it can increase awareness of affected areas by estimating material losses and affected people.

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