Analysis of Lead Time in The Upstream Citarum River Using Satellite and Stream Gauge Data
Abstract
Floods in the upstream Citarum, Majalaya, generally occur quickly and experience a rapid rise in the water level, termed flash floods. The short notice and event duration of flash floods often does not allow the affected community to carry out adequate early warning and disaster emergency response. In disaster events, lead time is the interval between the issuance of a forecast and the event itself. Minimizing the risk of flood hazards in the community requires an increase in the lead time. This study analyzed the lead time between rainfall events (from JAXA’s GSMaP data) and water level rise in Citarum’s Majalaya and Sapan. The water level rise used river authority’s gauge records data from 2018 through 2022. The current study shows several differences in the lead time for each event. In 2018, Majalaya to Sapan lead time was 4 hours; in 2019 Majalaya to Sapan lead time was 3 hours; in 2020 Majalaya to Sapan lead time was 3 hours; in 2021, Majalaya to Sapan lead time was 6 hours and in 2022, Majalaya to Sapan lead time was 2 hours. Determining the differences in lead time can be pursued for further refinement.
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