Pengendalian Banjir di Daerah Aliran Sungai (DAS) Ampal Kota Balikpapan: Analisa Kapasitas Sungai

Abstract

Ampal acts as the main channel in ampal drainage system. This river is located in
urban areas that serves to drain the water from the upstream to the sea (Makassar
Strait). Channel reduction, occurred in the middle to downstream channel, caused by
sedimentation leads to capacity reduction, further its unability to drain the flood. The
purpose of this study is to determine the river capacity as an alternative flood
prevention. Hydrology and hydraulics data are used in the analysis process. In flood
discharge calculation, the SCS-CN (Soil Conservation Service - curve number) runoff
calculation method is used. Based on the data and analysis, the maximum flood
discharge values flowing in the Ampal catchment are 100.20 m3/s for the middle
section and 170.40 m3/s at the downstream. The central part of the Ampal River
capacity is 60.69 m3/sec. and 168.50 m3/sec. at the downstream. Using three additional bozem, the problem at Section 3 Ampal River can be solved, with 7.70 m3/s flood discharge reduction.