Sabodam and the Impact Sand Mining Of Merapi

Authors

  • Rokhmat Hidayat Balai Teknik Sabo, Dirjen Sumberdaya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Keywords:

sabodam, lava floods, sand mining

Abstract

The 2010 eruptions of Mount Merapi resulted in 140 million m3 of pyroclastic materials. The eruptions carried associated eruption hazards and lava floods that transported sand, gravel and stone materials. However, apart from hazards, the eruptions present deposit of mineral sand and stone, which are the most populer materials on the market. In anticipating lava flood disaster, the government built a number of sabodam. It is a construction to control the flow of debris or lava, built across the river. The working principle is to control sediment by containing, partially accommodating and draining the material/sand carried by the flow. The sand accommodated by the sabodam has high volume and excellent quality for materials, making it highly desirable to mine. However, over-excavation of sand in the rivers of Mount Merapi, exceeding the natural supply from upstream, will degrade the riverbed. Therefore, a sandstone mining mechanism needs to be established. It should regulate permitted locations and volumes so that sandstone material can be mined without disrupting the sabodam. Without a proper mining regulation in place, sand reserves will be depleted and the existence of sabodam is threatened.

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Published

2022-08-19