Hydraulic performance of mini polder water management in flood management in Tabalong District, South Kalimantan

Abstract Flood disaster is a common problem, especially in densely populated urban, coastal, and basin areas, respectively. This leads to the development of Mini Polder design, which used solve problem flooding agricultural land. The design projected lebak swamp Ampukung village, Tabalong Regency, Indonesia, covering an area 393 Ha. Therefore, this study aims determine hydraulic performance mini polders flood management, within District, South Kalimantan, Indonesia. Using Hec-RAS planning stage, results showed that dike was produced with elevation width +10.30 4 m, based on Q25th discharge 514.37 m 3 /s. Furthermore, construction channel around land planned as replacement for retention pond, due efficiency excavation stockpiling. also functioned reducer, approached water sources rice fields or community plantations. By excavating existing outlet rehabilitating door building, normalization subsequently carried out. For emergency conditions, portable pump needed supply disposal river, during arrival dry season.