Recently, mining activities in the Bodri River, especially in the river area, have become increasingly concerning. Of course, if left unchecked, this will damage the river body, river channels, cause degradation of the river bed which can result in landslides of river embankments and river buildings and other buildings in the river.
Mining is carried out by local communities traditionally in the dry season or by entrepreneurs using heavy equipment (back hoe). Miners in the Bodri River do not yet have permits. Based on the above, the extraction of mining commodities in the Bodri River causes environmental damage.
The river area in the form of river boundaries is severely damaged. This condition is very disturbing to the surrounding community, the environment and ecosystem are damaged. On the one hand, traditional mining benefits the community because it is a source of income during the dry season, on the other hand, the ecosystem and environment are damaged if mining is carried out using heavy equipment without following the correct procedures.
Based on the results of data collection, compilation and analysis of regulations, territorial and technical analysis related to the planning area in the Bodri River, the following main conclusions can be identified: 1. The results of field inventory activities throughout the scope of this zoning activity, found that there were seven transverse/longitudinal buildings, including: 5 bridges, 1 check dam and 1 weir. The river facilities and infrastructure that were damaged were: ❖ Kali Putih Check Dam was built in 2017 and experienced damage to the check dam wall in 2019. Where ± 90 meters upstream and ± 60 meters downstream of the check dam building there were mining activities. ❖ Gabion upstream of the Singorojo Bridge was built in 2020 and was damaged in 2022. Where ± 400 meters downstream of the gabion building there were mining activities. ❖ Singorojo Bridge experienced erosion/landslides on the riverbank under the bridge. Where ± 325 meters downstream of the Singorojo Bridge there are mining activities.
2. From 11 (eleven) observation points, mining activities were found that did not have permits. These activities are in the form of manual extraction and also involve heavy equipment such as excavators and transport trucks.
3. Based on data from the Energy and Mineral Resources (ESDM) Service of Central Java Province in 2023, it is known that there are permit holders located on the Bodri River (in the study area). Including 3 IUP holding companies that are in the exploration permit stage and 2 companies are in the reserve permit stage.
4. Manual mining and heavy equipment until now still cause damage to river walls and cliffs and cause changes in river morphology, including erosion and sedimentation in several places.
Based on the analysis, there are quite significant changes in river morphology or flow based on a comparison of the digitization of the Bodri River trough boundary in 2015 with aerial photo mapping in 2023. Based on the results of the overlay analysis of the Bodri River trough boundary in 2015 with aerial photo mapping in 2023, it is known that there is a change in the river trough boundary of 4,322 meters in length, a change in the shift in the width of the river ranging from 2 meters to 250 meters (which has exceeded the width of the river boundary) and a height/thickness ranging from ± 2 meters. 6. The potential rate of sediment potential in the Bodri Watershed is 447,203.74 tons/year. This material is a general input to the sedimentation balance in the Bodri River (study segment 24.5 km), while the Suspended Load Discharge based on the calibration of laboratory sample test results for one year is 300,624.58 tons/year where this result is the sedimentation input of the Bodri River at the activity location. 7. The results of observations and interviews in the field show that the estimated volume of excavation/mining in the form of sand and stone is estimated at 576,700 tons/year, where this result is the output of sedimentation of the Bodri River at the activity location. This value includes observation points and also mining locations, including. 8. Based on the geological review and field observations, it can be concluded that mining materials in the form of sand and stone come from the right and left of the riverbank that has experienced landslides. This is because the Bodri Watershed does not produce sand and stone material input as volcanic products. 9. Based on the multicriteria analysis, it can be seen that the level of river damage, both in the river body and on the riverbank, shows moderate and severe damage due to mining, both manual mining and using heavy equipment, so that it is not allowed to carry out material/mining activities in the Bodri River planning area from the Lutut River in Kaliputih Village, Singorojo District to the Bodri River in Puguh Village, Pegandon District. In addition, the damaged condition of the river body and boundaries cannot recover naturally due to mining activities in the Bodri River.
Based on the Regulation of the Minister of Public Works and Public Housing of the Republic of Indonesia Number 28/PRT/2015 concerning the Determination of River Boundary Lines and Lake Boundary Lines, the boundary line on the Bodri River is set at a width of 100 m on the right and left of the riverbed. 11. The results of the analysis of flood inundation with annual Q50 at the study location (segment length 24.5 km) showed that in general the area of flood inundation is within the boundary line (100 m on the right and left from the edge of the riverbed). However, several agricultural lands, plantations, and residential areas located within the river boundaries are potentially affected by flooding.






