<![CDATA[Drainage channels are essential infrastructure for controlling stormwater runoff and reducing the risk of inundation and flooding. Accurate drainage dimension planning requires reliable hydrological analysis based on local rainfall characteristics. This study aimed to determine the appropriate dimensions of a drainage channel in Rimbo Recap Village, South Curup District, using rainfall data collected from 2018 to 2022. A quantitative approach was employed by integrating field observations, documentation, hydrological analysis, and hydraulic analysis. Maximum rainfall data were analyzed to estimate design rainfall, rainfall intensity, and design discharge using the Rational Method, followed by hydraulic calculations to determine the channel dimensions. The analysis produced a design discharge of 0.456 m³/s, while the planned channel capacity reached 0.511 m³/s, indicating that the proposed dimensions were hydraulically adequate. The recommended open rectangular channel has a width of 0.50 m, a water depth of 0.31 m, and a freeboard of 0.39 m, providing sufficient capacity to safely convey the design runoff under local hydrological conditions. The findings provide a practical reference for designing rural drainage systems based on local rainfall characteristics to improve flood mitigation and sustainable water management.]]>
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