Abstract:
Banjar Regency had encountered flooding problem for the last several years. Polder Liang became one of the solutions in Banjar Regency which had been built since the Dutch Colonization. However, in its current condition, the area that supposed to be developed as retention ponds cannot be function optimally; it was caused by water level control and waterworks system. The methods of this research include: field surveys, problem identification, problem definition, literature review, data collection, and analysis of hydrological data. Survey and investigation include tracking and waypoint GPS, then represent to ArcGIS software. Furthermore, hydraulics analysis was used to calculate
flow design and Liang Polder’s channels. The result of the study is to develop a database of Liang Polder. From the research, it is known that Liang Polder covers large area about 1.412,8 Hectares is potentially area but it is unable to optimally function because the number of water gates (5 main sluice gates and 20 small sluice gates). Nevertheless, one
important role for input and output water in the polder is the work of water gates. Consequently, it needs to optimize the operational and maintenance sector, especially for retention areas when rainy season comes.
