Abstract
Bengawan Solo Watershed is the largest watershed on Java Island, which also has fluctuating rainfall. The fluctuating rainfall may cause an alteration to the river discharge. The alteration can be analyzed through the SCS-CN model and Synder Unit Hydrograph. SCS-CN Java Island, which also has fluctuating rainfalis a well-known model in hydrological modeling that is commonly used because of its simplicity, stability, and predictability. Synder Unit Hydrograph is suitable for ungauged basins and may be used in watersheds about 25 km2 to 25.000 km2 (Sudhakar BS et al, 2015). The analysis and calibration were performed from the baseline data (2001-2022). The trend analysis was carried out by comparing the analysis results from data sequences with a ten-year range with the baseline data. According to the trend analysis, the rainfall design of the Bengawan Solo watershed has increased by approximately 4–6% in 2013–2022 compared to the baseline (2001-2022), which may lead to a 10% increase in flood design discharge in Bengawan Solo.
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