Evaluasi saluran drainase pada Jalan Lingkar Selatan sta 3+350 s/d sta 4+850, Cilegon

Abstract

The Cilegon City South Ring Road is a strategic and important road because it serves as a route to tourist areas and industrial areas such as factories and logistics flows to Merak Port. One problem on this road is the occurrence of waterlogging on the road surface. This can be caused by changes in land use from vacant land to residential areas or other buildings, which impacts the inability of the existing drainage system. Therefore, an evaluation of the drainage channel capacity on this road is necessary. Evaluation of the adequacy of drainage capacity is analyzed by comparing the existing channel capacity discharge with the planned flood discharge. The existing channel capacity discharge is calculated using hydraulic analysis with flow velocity calculations using the Manning formula, while the planned discharge uses the rational method with rainfall intensity calculated at return periods of 2 years, 5 years, 10 years, 25 years, and 50 years using the Mononobe formula. The drainage channel is considered safe if the channel capacity discharge is greater than or equal to the planned flood discharge, while the channel is categorized as overflowing or unsafe if the planned flood discharge is greater than the existing channel discharge. The results of this study found an overflow in the existing channel with a 50-year return period. The existing channel is not capable of accommodating the planned flood discharge, so it needs to be redesigned by enlarging the channel dimensions.