Over the past 10 years, the POMPONG watershed has experienced a drastic change in land use, from agricultural to gradually becoming residential and mining area. Mining activities carried out in the Pompong watershed result in changes the characteristics of the watershed and the presence of vegetation that functions as land cover. Therefore, this study aims to investigate the extent of the impact caused by tin mining activities on the survival of vegetation to maintain environmental quality. The data of vegetation type was obtained through field observation. Besides, several maps of the Pompong watersheds, such as.watersheds and river networks, land use, soil types, land slopes, contour, topographic and administrative boundaries were needed. These maps were obtained from several related agencies. Data processing and analysis used ArcGis 10.1. The observation results showed there are four types of vegetation, namely secondary-dryland-forest, dryland-agriculture, dryland-agriculture-mixed-with-shrubs, then bush-and-shrub. The research results indicated there was a change in the function of the land from dryland-agriculture-mixed-with-bush to mining by 0,327%. The existence of these vegetations affect the ability of surface water absorption. Therefore, it is better to use vegetative methods in managing the conservation of land around the Pompong watersheds.
Changes in land use cause a reduction in water infiltration, and can cause environmental damage such as floods and inundation. Flood inundation occured freuently every year. In addition, other environment damage is a change in morphological characteristics around the river. This happened in the Pompong watershed with an area of 7,701.192 hectares located in Bangka Regency. The purpose of this study was to determine the effect of runoff coefficient (C) and total surface runoff discharge (Qp). The method used in this study is the Nakayasu HSS method with a return periode of 50 years. Land use changes were analyzed from 2009 to 2018. The result of the analysis showed that the amount of surface runoff discharge (Qp) in the Pompong watershed was strongly influenced by land use changes. The change occurred from 2012-2013 with a decrease in C value of 0.001 resulting in a Qp values of 0.943 m3/second, a C value in 2014-2015 decreased by 0.007 resulting in a Qp value of 5.395 m3/second, in 2015-2018 there was an increase a C value of 0.116 results in a Qp values of 100.512 m3/second.
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