Relocation Alternative of the Upstream Glonggong River due to Changes in Land Use

Abstract

The gas production and processing unit's construction plan in the Jambaran-Tiung Biru Gas Plant project is within the Upstream Glonggong River catchment area. Planning arrangement of the Jambaran-Tiung Biru Gas Plant right above the Upstream Glonggong River will impact the disruption of the river's flow and function. Therefore, some of the Upstream Glonggong River segments need to be relocated so that the river's existence and function will not be disturbed. This research aims to find the best alternative in relocating the Upstream Glonggong River. The research method is carried out through hydrological and hydraulic calculations. The selection of relocation alternative of the Upstream Glonggong River was carried out using nine criteria weighting method. The selection criteria for river relocation alternatives used are: 1) upstream channel bottom elevation, 2) channel bottom width, 3) water level, 4) freeboard, 5) channel height, 6) gas plan facility elevation, 7) supporting buildings, and 8) mitigation and risk. The analysis result shows that the alternative selection analysis based on nine criteria assessment indicate that Alternative II (gas plan facility elevation +60.00 m, upstream channel bottom elevation +58.40 m, channel bottom width 6 m, drop structure, retention pond, and overflow) is the best relocation alternative of the Upstream Glonggong River for the construction plan of the gas plan facility in Jambaran Tiung Biru.