Evaluasi dan Analisis Kolam Retensi Pengendalian Banjir: Studi Kasus Kolam Retensi Brimob Kota Palembang

Tri Fitriana (Program Studi Magister Teknik Sipil, Fakultas Teknik, Universitas Sriwijaya)
Taufik Ari Gunawan (Jurusan Teknik Sipil dan Perencanaan, Fakultas Teknik, Universitas Sriwijaya)
Imroatul Chalimah Juliana (Jurusan Teknik Sipil dan Perencanaan, Fakultas Teknik, Universitas Sriwijaya)

Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil
Vol 9 No 2 (2020): Cantilever

Brimob retention basin is located within the Sekanak Sub-watershed system, which is a flood-prone point. Administratively, the Brimob retention basin area is a part of the Sub-district of Ilir Barat I. The research method used is computer modeling. The steps taken are data collection, hydrological analysis, cross-sectional analysis, hydrological and hydraulic modeling using pumps. The Brimob retention basin can accommodate a volume of water up to 115,103.73 m3, up to an elevation of the embankment of + 4.30 m. The magnitude of designed rainfall is R2 = 118.78 mm, R5 = 144.78 mm, R10 = 161.99 mm and R25 = 183.73 mm. The peak discharge of each return period is Q2 = 6.30 m3 / s, Q5 = 7.67 m3/s, Q10 = 8.59 m3/s and Q25 = 9.74 m3/s. To assess the effectiveness of pump operation, 2 (two) pumping capacities are simulated, namely: 250 l / sec and 500 l / sec, each used 2 (two) pump units. The simulation used a pump with a capacity of 500 l / sec, and the amount of discharge (inflow) for each return period is as input. The conclusion is that the use of a pump with a capacity of 500 l / sec can overcome excess water volume and avoid runoff and be effective in dealing with the excess water in the Brimob retention basin.