Simulasi Saluran Drainase di Jalan Jembangan Kecamatan Sukoharjo Menggunakan Software HEC-RAS 4.1.
Abstract
The road drainage function is as a channel to accommodate runoff from road body and surrounding catchment area. Jembangan Street Sukoharjo District is a strategic road for local residents because it connects Gumpang Village to Slamet Riyadi Highway, and an important road for truck factories that cross road because there are several large factories around it. During rainy season, Jembangan Street Sukoharjo District suddenly experiences inundation and even flooding. This study purpose is to analyze and simulate existing drainage channels ability to accommodate design flood. The analysis methods in this study include Log Pearson III Distribution method to analyze design rainfall, Rational method to analyze design flood, hydraulic equation to analyze existing drainage channel discharge, and drainage channel simulation using HEC-RAS 4.1 software. Based on analysis results, existing drainage channel 0,322 m3/s capacity is still able to accommodate design flood for a 2-year (Q2), 5-year (Q5), and 10-year (Q10) return period with each design flood of 0,051 m3/s, 0,093 m3/s, and 0,134 m3/s. The simulation results of downstream drainage channel Sta 0 obtained drainage channel 0,21 m at Q2; 0,32 m at Q5; and 0,41 m at Q10 water level. Flooding on Jembangan Street Sukoharjo District can be caused by garbage accumulation, nuisance plants on channel banks, and road elevations that are lower than drainage channel embankments. To deal with flooding, periodic maintenance is needed on drainage channels, as well as raising road elevation.
