<![CDATA[Kaliakah Village in Jembrana Regency faces seasonal flooding due to land use changes and inadequate drainage systems. Inundation frequently occurs, especially in the Cempaka Road area, as surface runoff and channel sedimentation increase. This study aims to evaluate the existing drainage channel's storage capacity and redesign its cross-section using HEC-RAS 6.0 software to accommodate the planned flood discharge for a 5-year return period. Hydrological analysis was conducted based on rainfall data with discharge calculations using the Rational method, while hydraulic evaluation was conducted through HEC-RAS modeling. The results showed that the planned flood discharge of 0.46 m³/second with a concentration time of 0.38 hours could not be accommodated by the existing channel, specifically at STA 0+100–0+300 which experienced overflow. Therefore, a redesign of the channel was carried out using a 60x80x120 cm U-ditch, which was proven to be able to accommodate the discharge safely and efficiently in an effort to mitigate regional flooding.]]>
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