Suparta IW. Combining hydraulic roughness measurement results with Manning’s roughness coefficient in drainage channels: A case study of drainage channels in Denpasar City, Bali Province. IRJEIS [Internet]. 2025 Aug. 11 [cited 2026 May 3];11(5):130-4. Available from: http://sloap.org/journals/index.php/irjeis/article/view/2551