Numerical Hydraulic Model of Water Fluctuations in Section 4 Jakabaring Sport City (JSC) Main Channels, Palembang, Indonesia

Based on the division of river areas in the city of Palembang, there are 21 sub-watersheds, but only 18 sub-watersheds that lead directly to the Musi river, namely the Rengas Lacak, Gandus, Lambidaro, Boang, Sekanak, Bendung, Lawang Kidul, Buah, Juaro, Batang sub-watersheds. , Sei Selincah, Keramasan, Kertapati, Kedukan Ulu, Aur, Sriguna, Jakabaring and Plaju.The study was conducted to see the changes in the water level in the main channel of Jakabaring Sport City (JSC) in section 4 using the HEC-RAS ver.4.1.0 program.The results showed that the pattern of water flow movement in the main channel of Jakabaring Sport City (JSC) in section 4 has an overtopping area, namely at station 0 + 000, both the return period (R) 2, 5, 10, 20 and 50 years, which is 2.50 m both on the right and left of the cliff channel.At stations 0 + 100 to 0 + 900 in the return period R20 (PF4) there is an increase in water level (over flow) between 0.50 m to 2.00 m. Meanwhile, at sta. 1 + 000 there is no water level rise in the channel