I In the Griya Bintara Indah housing area, the area is lower than the surrounding area and the main drainage channel has no capacity to accommodate excess water discharge, especially when it rains with a certain intensity. To overcome this, a polder system planning is carried out. Data collection was carried out at the research location regarding location, topography, drainage basin, land use, rainfall, and dimensions of the existing canal. Analyzing the data, hydrological analysis, design flood discharge analysis, and hydraulic analysis were carried out. There are 2 alternatives in the planning, namely the first polder system planning without increasing the canal dimensions, then the second alternative is planning the polder system by increasing the canal dimensions. Next is the economic feasibility study, in this stage the calculation of the budget plan is carried out, an analysis of the cost of the impact of inundation and a sensitivity analysis method is carried out. The conclusion from this study is that 37 existing canal sections are no longer able to accommodate regional flood discharges, so planning these 2 alternatives is carried out, for an alternative polder system with enlarged channel dimensions, the existing canal is replaced with a 500/500 U-ditch. Then for the retention pond has a volume of 35481.62 m³. Then for the second alternative economic feasibility study, namely the polder system with enlarged channel dimensions, it is more feasible to plan because the total cost of expenditure is lower.