Evaluasi Saluran Drainase pada Kawasan Jalan Tuamang Kecamatan Medan Tembung Kota Medan

Abstract

Quite high rainfall and the inability of drainage to accommodate rainwater are blamed for causing flooding. Especially in the Jalan Tuamang area. This problem was raised due to the frequent occurrence of floods and high levels of rainwater in the area, especially during the rainy season. Given this problem, an evaluation of the capacity of the drainage channels will be carried out, one of which is by repairing and re-planning the dimensions of the channels in the Jalan Tuamang drainage to accommodate flood discharge. This research began in the even semester of the 2022-2023 academic year and the case study was carried out in the Jalan Tuamang area, Medan Tembung District, Medan City. Data collection in this research included primary data in the form of existing drainage system data and flow condition data and secondary data in the form of maximum daily rainfall data from BMKG Sampali and Helvetia. In this study, the log person III distribution was used and the rainfall intensity value obtained using the mononobe formula for a 10 year return period was 143.67 mm/hour. From the results of the evaluation of the planned flood discharge for a 10 year return period using the rational method, Qr₁ = 4,522 m3 /sec and Qr₂ = 4,354m3 /sec. By calculating the existing channel capacity, we get Qs₁ = 3,396 m3/sec and Qs₂ = 0.6426 m3/sec. Based on the results of the comparison of channel discharge and plan discharge above, it can be seen that the existing drainage channel 1 cannot accommodate flood discharge, because the plan discharge is greater than the channel discharge. Then drainage channel 2 also cannot accommodate flood discharge. In this case, it can be overcome by re-planning the drainage channels.