The design of drainage system planning plays an important role in tackling rainwater in an area, and if there is an error in the design calculations in drainage system planning, there will be puddles or flooding in the area around the drainage canal. Therefore, it is necessary to take measures that not only solve drainage problems in the short term but also deal with drainage problems in an integrated manner, including eco-drainage, where the location conditions for the Maritime Tower project are in the lowlands, close to the beach or sea area, the type of soil is clay, and the drainage system used is a conventional drainage system. The purpose of this study is to deepen the information related to the selection of the drainage system and determine whether the drainage selection used by the project is effective. Based on the results of this research that has been done, it can be concluded that the most effective drainage systems to be used in the repair of the Maritime Tower project are the conventional drainage system and the eco-drainage channel system using the rorak method.