Determining the Side Channel Area in the Ciliwung Watershed for Decreasing the Hydrograph Flood

4th International Conference on Civil and Environmental Engineering for Sustainability

地球科学;生态环境科学;经济学

Supomo, Fani Yayuk^1 ; Pallu, Muh. Saleh^1 ; Thaha, Muh. Arsyad^1 ; Lopa, Rita Tahir^1

Hasanuddin University Hasanuddin, Jl. Poros Malino Km. 6, Gowa, Indonesia^1

关键词: Detention time;    Flood discharge;    Flood hydrographs;    High population density;    Rainy seasons;    Reservoir volume;    Return periods;    Switch function;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/140/1/012038/pdf
DOI  :  10.1088/1755-1315/140/1/012038

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The condition of Jakarta with high population density and green open space switch function, causing the condition of flooding to be one of the risks that occur when the rainy season. Ciliwung River that flows from Katulampa into Jakarta bay, is considered as the largest contributor to flood discharge. This study will analyze the flood discharge plan on the side channel area to lower the flood hydrograph peaks and extend the detention time. The area to be side channel is Ciparigi with an area of 608.7 hectare and the slope of 8-10%. The result of flood discharge planning analysis at Ciparigi region (Sub watershed of Middle Ciliwung), obtained the amount of flood discharge for return period 2 yearly equal to 10.10 m3/sec, 5 yearly equal to 12.77 m3/sec, 10 yearly equal to 14.17 m3/sec, 25 yearly equal to 15.32 m3/sec, 50 yearly equal to 16.63 m3/sec and 100 yearly equal to 17.52 m3/sec. The percentage of flood discharge plans that will be reduced by 10% of the total flood discharge plan in sub watershed observation is 1.28 m3/sec with reservoir volume of 4.608 m3which will be fully charged for 1 hour. This will extend the flow time from the control point in Depok to the Manggarai waterway to approximately 5 hours.