<![CDATA[This study evaluates design-storm surface runoff and an infiltration-well scenario for the Tanralili Sub-Watershed, South Sulawesi, Indonesia. Annual rainfall records for 1997–2018 from Tanralili, Tompobulu, and Batubassi stations were used to derive regional rainfall, design rainfall with Gumbel and Log-Pearson type III distributions, and short-duration intensity using the Mononobe equation. Peak runoff was estimated with the Rational method for eight land-cover classes. The no-well scenario used an 85.35% runoff factor and the infiltration-well scenario used 27.63%; these factors were treated as scenario assumptions rather than measured field efficiencies. Summed Rational-method discharge increased from 56.90 m³ s⁻¹ for the 2-year event to 95.65 m³ s⁻¹ for the 25-year event. At the 25-year return period, scenario discharge decreased from 82.49 to 26.71 m³ s⁻¹, with the largest absolute reduction assigned to mixed dryland agriculture (23.95 m³ s⁻¹). The results identify high-leverage locations for runoff control, but engineering deployment requires reconciliation of mapped areas, land-cover-specific runoff coefficients, field infiltration measurements, and event-based hydraulic validation before the scenario can be interpreted as operational performance.]]>
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