Effect of Reservoir Sediment Flushing from Wlingi and Lodoyo Reservoirs on Downstream River Water Quality
In order to cope with severe sedimentation problems in Wlingi and Lodoyo reservoirs in the Brantas River basin, East Java, Indonesia, sediment flushing has been conducted since August 1990, immediately after the eruption of Mt. Kelud in February 1990. The sediment flushing has been conducted mostly during the rainy season by coordinated gate operation to recover the reservoirs’ capacity. The largest and most intractable downstream environmental impacts associated with sediment release from reservoirs are caused by reservoir emptying and flushing. When sediment flushing measure is performed, environmental effects should be considered comprehensively. To understand the adverse environmental effects of sediment flushing in Wlingi and Lodoyo reservoirs on the downstream reaches, an investigation was carried out to study water quality before, during, and after the sediment flushing operation. This study was conducted to investigate the adverse environmental effects on the downstream reaches’ water quality of Wlingi and Lodoyo reservoirs based on the sediment flushing operation conducted on 17-19 March 2009.
KeywordsSediment Flushing Reservoir River Water Quality
The authors would like to thank Jasa Tirta I Public Corporation, the Brantas and Bengawan Solo River Basins Management Agency, Indonesia, for providing the water quality data.
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