Design of drainage system on industrial area Kampung Cina, Dobo City, Aru Islands Regency, based on Eco drainage using with HEC-RAS 4.0

Abstract

This study aim to plan a drainage system in the Industrial area of Kampung Cina Dobo City that can overcome the problems of inundation occurred. The inundation is caused by the drainage channel that has not been properly arranged and is still in the form of a natural drainage channel, most of which still use the road drainage network whose condition is not functioning properly due to sediment and garbage which results in many drainage channels being cut off. Data processing is carried out with two analyzes including hydrological analysis and hydraulic analysis. The hydraulics analysis includes channel section planning and drainage system modeling with HEC-RAS 4.0 software. In conventional drainage discharge flowing in the channel before the end of drain amounted to 1,136 m3/sec. Once added a retention pond with a capacity of 10.358 m3 with 5 scenario dimensions spillway. The results of modeling obtained by the reduction of the maximum flood flow is 1,07 ms / sec with dimensions of aperture is 8 m x 0,8 m and lower the water level in the upstream channel by 31 cm and 44 cm in the downstream channel.