DefinePK

Abstract

Every region in Indonesia, especially those around rivers that develop to urban areas is always faced with the problem of flooding in every rainy season. Flood disasters ranging from mild to large (flash floods) will have an impact on community activities and often result in property losses and even fatalities. To be able to anticipate the impact of flooding, a method is needed to estimate the amount of flood discharge and the potential for overflow that will occur in the area around the river. One method that can be used is hydrological analysis and hydraulics simulations, where hydrological analysis will obtain the amount of flood discharge at each repeat event, while hydraulics simulations can obtain data on potential flood discharges that will inundate the area around the river if no prevention and control measures are taken good and measurable countermeasures. In this study, to determine the return flood discharge, the Nakayasu method was used with river characteristics according to the data obtained, while the hydraulics simulation used HECRAS software. The results of hydrological analysis and hydraulics simulations show that for a 10-year return flood discharge of 323.01 m3/s, there is the potential for an overflow of 14.5 km with an inundation area of 15,314 m2 and a flood discharge for a 20-year return period of 376.43 m3/s. potential for overflow along 14.6 km with inundation area of 17,441 m2.