PT. Dinamika Sejahtera Mandiri has 6 settling ponds. One of the factors that must be considered in mining activities is the residue from the washing process that will enter the settling pond. Pool conditions at PT. The Mandiri Sejahtera Dynamics seems to be almost full, which requires a study on the maintenance of the settling pond to be carried out. This research aims to plan and schedule the dredging of the settling pond and the addition of tools for optimal pond maintenance.The research was conducted by collecting primary and secondary data, primary data consisting of tailings samples, circulation time, and full discharge time. While secondary data consists of rainfall, equipment specifications, pond depth, and pond area. Then it will be processed from the calculation of planned rainfall, rainwater discharge, percent solid, particle velocity, settling material, pond dredging time and the number of additional tools.

A study of the tides in the river has been carried out in this paper. The rivers studied are the Jawi River (Kakap) and the Nipah River. The two rivers are located in Kubu Raya Regency, West Kalimantan. This study aims to determine the type of tides and water level elevation in the two rivers. This study uses the Admiralty method to analyze existing tidal data. This method is commonly used in tide analysis. The results show that the tidal type of the Jawi River is a diurnal tide. The water level in the Jawi River is HHWL of 1.4 m (+0.86 m from MSL) and LLWL of –0.319 m (-0.859 m from MSL). Meanwhile, the tidal type of the Nipah River is a mixed tide prevailing diurnal. In addition, the water level is HHWL of 1.167 m (+0.82 m from MSL) and LLWL of –0.473 m (-0.82 m from MSL). This study is expected to be helpful as a reference for infrastructure development in the research area.

PT. Dinamika Sejahtera Mandiri has 6 settling ponds. One of the factors that must be considered in mining activities is the residue from the washing process that will enter the settling pond. Pool conditions at PT. The Mandiri Sejahtera Dynamics seems to be almost full, which requires a study on the maintenance of the settling pond to be carried out. This research aims to plan and schedule the dredging of the settling pond and the addition of tools for optimal pond maintenance.The research was conducted by collecting primary and secondary data, primary data consisting of tailings samples, circulation time, and full discharge time. While secondary data consists of rainfall, equipment specifications, pond depth, and pond area. Then it will be processed from the calculation of planned rainfall, rainwater discharge, percent solid, particle velocity, settling material, pond dredging time and the number of additional tools.

Sungai Itik Village is located in Sungai Kakap District, Kubu Raya Regency, directly visiting Pontianak City. However, the people in Itik Village have not yet enjoyed clean water from the local water company. So that the surrounding community uses clean water sourced from rainwater or drilled wells. However, the condition of the well water is not yet suitable for use. At the As-Siddiqiyah Islamic Boarding School, it has drilled wells with a flow rate of 30 liters/minute and does not need to be sucked up with a water pump in flat, level conditions. However, the condition of the water still contains a lot of Fe2+ ions, has a metallic smell and color. This drilled well water is very possible as raw water to be processed and used as drinking water that can be consumed by the community around the Islamic boarding school. The Student Creativity Program Team of the Faculty of Engineering provides air purification solutions with the Aeration, Sedimentation and Filtration methods contributing to the local community, especially for students at Islamic Boarding Schools. The results of laboratory tests on drilled well water at the As-Siddiqiyah Islamic Boarding School show that raw water that has been treated through water treatment equipment is suitable for daily activities and does not cause health problems. The provision and management of clean water is left entirely to the students in Islamic boarding schools to maintain the continuity and maintenance of the availability of clean water.