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Sei Putih is one of the rivers whose flow crosses the settlements of Medan City residents. Flood-prone areas in the planning area include river estuaries, floodplains especially along Sei Putih. To protect against floods in rivers, a plan for safeguarding against flooding can be carried out by planning buildings that aim to reduce the damage caused by flooding to the minimum level. The control planning can be carried out well if the rainfall data at each rain station can be known and the discharge calculated using a Synthetic Unit Hydrograph. The hydrograph method used is the Nakayasu Synthetic Unit Hydrograph. This method aims to analyze the amount of planned rainfall that may occur in Sei Putih until 2070 and analyze the design flood discharge to evaluate the magnitude of the design flood discharge at various return periods of 2, 5, 10, 25, 50 years. In the results of the rainfall analysis used to calculate rainfall intensity is the value of the Pearson Log III rainfall distribution for the 10-year return period (2012-2021). From the calculation results, it is obtained that the maximum rainfall that will occur is 620.35 mm, and the planned flood discharge for the HSS Nakayasu return period of 2,5,10,25,50 years is 130.58 m³/d, 150,488 m³/d, 160 .48 m³/d, 168.799 m³/d, 184.56 m³/d and 171.295 m³/d. The results of the study show that the flood discharge from year to year has increased, therefore it is necessary to maintain or scrape the river.
Keywords: Flood, Nakayasu, repeat.
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