STUDY OF COASTAL DIKE AND RETENTION POND PERFORMANCE ON FLOOD AND TIDAL CONTROL IN PEKALONGAN

• Main Author: Gilang Irawanto, Adhitya
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/80570
• Institution: Institut Teknologi Bandung

Pekalongan is one of the areas located in the north of Java Island. The main problem in Pekalongan, like other areas in the north of Java Island, is tidal flooding, where seawater enters the mainland at high tide. Tidal flooding in Pekalongan has occurred for years and has inundated residential areas, public facilities, and economic areas. This tidal flood worsens when there is a high discharge in the river. For this reason, the government built a coastal dike and a retention pond to overcome these problems. The concept of this system is to create a coastal dike that crosses the river, blocking backwater from the sea to eliminate tidal effects. The retention pond is located along the coastal dike to accommodate the discharge from the river, then the water will be pumped downstream of the river and will flow into the sea. This study simulates flooding in the coastal area of Pekalongan to see the effect of the construction of coastal dike and retention ponds in controlling floods and tidal waves in Pekalongan. This study aims to obtain pump operating time for each pump built in this system to reduce the flood elevation of Q25 to an elevation of –0.5 m in the retention pond. This study also saw the pump's operating time after adding the Mrican pump and the valve door on the Mrican. The methodology used in this study is flood modeling with the HEC-RAS 6.0 model. This research shows that the pump operating time for the Silempeng and Sengkarang pumps is 150 hours. After the addition of the Mrican pump, the operational time of the Silempeng pump, the Sengkarang pump, and the Mrican pump was 49 hours. After adding the Mrican valve door, the operating time for each pump became 36 hours. In this study, researchers also carried out modeling to see the effects of sedimentation in ponds and land subsidence that occurred over ten years, and the result was that the operating time for each pump was 42 hours.