Analysis Of Land Erosion Due To Sand Mining In River Progo Area Kulonprogo RegencySpecial Region Of Yogyakarta

The Progo River originates from the slopes of Mount Sundoro-Mount Sumbing which passes to the southeast and then to the south along 140 km. When Mount Merapi erupts, the material from the eruption, namely cold lava will flow into the Progo river and in the area around the estuary, there are much sand and stone mining. The problem from this research is that there is a very high level of erosion due to sand mining due to the absence of vegetation, so soil erosion is easy when there is high rainfall. The purpose of this study was to analyze the level of soil erosion. The method used in this study is the USLE method. To test soil samples in the laboratory, three methods were Walkley and black for organic matter content, hydrometer for soil texture analysis, and de boot for soil permeability. The calculation of the erosion hazard level using the USLE equation has an erosion hazard level in the category of very light to very heavy class. The results of the estimation of the rate of soil erosion are as follows: from the erosion hazard level which has a very heavy erosion hazard level, namely 1 at location 09. For moderate erosion hazard levels, namely 2 at location points 013 and 0.14. There are 2 levels of low erosion hazard, namely at locations 05 and 08. On heavily eroded land, efforts to conserve land, both mechanically and vegetatively, are necessary to reduce land erosion.