Canal as a Solution to Reduce a Puddle in the Drainage System of Passo - Ambon City

Due to the low infiltration capacity as the effect of land expansion into buildings / concretization in an area will have an impact on the surface flow rate which results in a drainage system that is not optimal. For this reason, routine flooding / inundation in Passo area is minimized by involving the canal of Passo as a water body that can manage flooding. The average rainfall data of 14 years is used to model the rainfall plan and land use data of 0.4-0.7 in the way tonihatu watershed is a variable of runoff coefficient. For the planned discharge with a 25-year return period of 14.84 m3 / sec with the Nakayasuyang synthetic hydrograph used to model the channel capacity of 46 nodes. From the simulation results of the existing condition, only 3 nodes are safe, after that the flow model and channel capacity are improved according to the channel characteristics requirements, the simulation results show the ability of the safe channel capacity to discharge the planned system.