Water management is crucial, especially in the rainy season. Over time, climate change causes an increase in rainfall which results in increased surface runoff. In addition, the increase in surface runoff is caused by the conversion of land functions from green land to watertight land such as roads, urban areas, buildings and others. This chain event resulting flood. However, considering the condition of the land surface in the capital, which has fallen and is almost level with sea level, the usual solution cannot be utilized. By utilizing the polder system which is a closed system of water flow flowing with the help of a pump and the flow of water in the system can be monitored and regulated in and out, it is expected to be a solution to flood problems in the capital city. For this study, a case was taken in the KBN 2 area which is one of the Sunter-Cakung Polder areas. The area of KBN2 itself, broadly and largely, is the largest contributory area of runoff in the Sunter-Cakung polder system. From the results of the analysis obtained, with the application of the polder system by making a storage pond as high as 5 meters and an area of about 5 Ha in the downstream of the river and the existing pump operation of 1 unit with 1 m3/s capacity, the area that was previously affected by the flood, was reduced quite widely.
Keywords
Flood, Polder, Retention Pond, Urban Areas and Pump