The Spatial Decision-Making System in Mitigation of the Southern Ring Road of Inundation Sub Watersheds

Abstract

The high rainfall Palembang and tidal conditions DAS (watersheds) Keramasan cause the puddle on the surrounding area. Length of inundation that happened will cause impact damage to the road surface. Ring Road South of the city of Palembang is an important access that connects the city of Palembang with Regency Ogan Komering Ilir (OKI). The purpose of the research is the realignment of the South ring road by conducting simulations against a pool of conditions that occur in the appropriate mitigation so that the South Ring Road Sections not inundated again. The methods used are analyzing precipitation and discharge height of tidal river Keramasan so obtained discharge peak puddle, to know the pattern of distribution of pools by using the techniques of SIG (geographic information systems). The condition of the height of the area is modelled with a DEM (Digital Elevation Model) and high standing is modelled with Arcgis. With the expected mitigation modelling can be determined and is planned to determine the appropriate mitigation alternative criteria over the problem of standing water on roads roundabout South of the city of Palembang. Results of analysis showed the magnitude of the Qp Sub DAS Keramasan for 2 years is 55,519 M3/S, the 5-year anniversary period of 75,733 M3/S, and a period for 10 years anniversary of 87,249 M3/S. Based on the calculation of peak discharge and simulated altitude DEM then, the height of the southern Ring Road of the city of Palembang are unaffected is 1.20 meters tall standing.