Abstract

Floods, due to high rainfall and topographic conditions, can cause waterlogging high way underpass area. Underpass roads, as important infrastructure, are vulnerable to waterlogging, especially in several locations in Indonesia such as the Sentiong Underpass, Kemayoran, East Bekasi, and in Semarang (Dempel as local road, Soekarno Hatta as artery road). This research aims to determine the priority of alternative accessibility solutions to the problem of flooding in underpasses. There are three alternatives, including upperpass access road, underpass with raising elevation of toll roads, and underpass road without raising toll road elevation using micropolder system. The method used is the analytical hierarchy process. There are eight criteria to select alternative solution for non-level road models in flood areas, namely construction cost; construction implementation technical; construction implementation time; construction safety management system; comfort; operations and maintenance; environment; impact on society. Based on the results of weighting alternatives against all criteria, the most prioritized alternative is alternative 3, fixed elevation of toll road and environmental road accompanied by micropolder, with a weight of 0.403 (40.3%). Second place is alternative 2, raising the elevation of toll roads and environmental roads, with a weight of 0.318 (31.8%). Then, third place is alternative 1, upperpass, with a weight of 0.279 (27.9%). So, through alternative 3, an underground water storage wall structure can be created to regulate water discharge, equipped with a pump house. This aims to act as a temporary water reservoir to deal with excess water volume when it rains.