The Arus Kualan traditional school was founded based on concern for cultural change, environmental damage, as a result of changes in land use to oil palm plantations. Therefore, this study aimed to examine the existence of the Arus Kualan traditional school in maintaining the environmental and cultural heritage by education. This research used a qualitative descriptive method. Researchers were as a key instrument for interviewing founders, managers, students, the Tahak villager, and direct observation to the location. The results of the interview and observation were triangulated to obtain data validity. The data were analyzed by using qualitative descriptive study which is called inductive. The result showed that Arus Kualan traditional school presents as means building the equality of general and indigenous knowledge by educating the children with literacy, technology, and the development of general knowledge but still along with reintroducing indigenous knowledge, customary values, and local wisdom. This Arus Kualan traditional school also emphasized nature protection because the approach and effort to preserve and protect the environment is implemented well. The lessons are manifested in traditional story class, weaving class, traditional medicine class, traditional value class, literacy class, and traditional dance and music class.

This research located in Beruang Block Kalimantan. The purpose of the mine drainage planning system is to control runoff water. Therefore, an excellent drainage system is needed without interfering with mining activities such as runoff water pollution, which could cause contamination in the surrounding area and outside the mining sites. Based on the analysis of rainfall data of 2009-2020, the precipitation plan was 341.67 mm/day; the concentration time was 2.37 h, the rain intensity was 41.06 mm/h, and repeated rain periods were 2-years. The extensive catchment area was 1.52 km2 because the runoff entering the sump was 44.38 m3/h. To prevent the water from entering the mining area, an open channel was made around the mine openings, and the water flows naturally into the sump. The water pumped into the settling pond with the pump type Allight HL 150MHD-IT at 50 m/s for 3-days with a single rain, resulting in total water volume of 17,556.5 m3/day. A trapezoidal shape was designed for a sump with dimensions of 3.96 m in length and width at the surface, 1.79 m length and width at the base, and 1.03 depth.