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Abstract— The Tallo River is a drainage channel estuary in this area, in addition to being a resource provider, the Tallo River also has the potential to pose a threat of flooding because it is strongly influenced by tides. Regulatory Ponds are flood control structures built upstream from areas that will be protected from flood hazards. In this thesis the researcher analyzes the capacity of the Nipa-Nipa regulatory pool with the Ripple method. Flood tracing results obtained a maximum of 3,395,116.79 m3, while topographic conditions obtained a maximum of 3,583,270.96 m3 then optimization analysis based on the Ripple Method obtained with a volume that was accommodated during 1980-1984 was 2,508,330,462 m3, during 1985- 1989 was 2,158,594,429 m3, during 1990-1994 it was 1,721,928,984 m3, during 1995-1999 it was 2,072,035,680 m3, the volume that was accommodated during 2000-2004 was 2,526,941,033 m3, the volume that was accommodated during 2005-2009 was 1,996. 205,351 m3 and the volume that was accommodated during 2010-2014 was 1,913,798,405 m3. This shows that the capacity of the Regulated Pond storage can serve to reduce flooding in the Tallo River