International Journal of Engineering and Emerging Technology, Vol. 5, No. 1, January—June 2020 24 P-ISSN: 2579-597X, E-ISSN: 2579-5988 Drilling Groundwater for Raw Water in Sembiran Village, Tejakula Districts, Buleleng Regency Ketut Agus Karmadi, I Wayan Redana, I Nengah Simpen, Mawiti Infantri, Bambang Soenarto Program Doktor Fakultas Teknik, Universitas Udayana 1 Doctoral Study Program of Engineering Science, Faculty of Engineering, Udayana University Kampus Sudirman, Denpasar-Bali, Indonesia. 2,3,4 Civil Engineering Department, Faculty of Engineering, Udayana University Kampus Sudirman, Denpasar-Bali, Indonesia. *Email: agus.karmadi@gmail.com Abstract - Water is an absolute necessity that must be met, both for drinking water and for irrigation. An alternative to meet the water needs other than rainwater or surface water, is by taking underground water by drilling deep wells. Sembiran Village is a village located in Tejakula District, Buleleng Regency, the village is a dry area that requires water, both for drinking water and for agriculture. Location of groundwater drilling including Tejakula groundwater basin. In order to achieve the above objectives, an effective and efficient groundwater drilling technique should be carried out considering that the area geologically has rocks dominated by volcanic lava rock which are the products of Mount Agung and Mount Buyan Beratan Purba. The method of drilling groundwater is carried out in stages starting from drilling a Pilot Hole with a diameter of 6 to 64 meters, followed by an enlargement of 8 ", 10" to 12 "drill holes to a depth of 64 meters. In the field of drilling work the Hydrolic Rotary System Method, Direct Circulation Rotary Drilling is used and for the removal of cutting / dirt mud Fludia is used. The equipment used for drilling is rotary / skid mounted drilling machines with a capacity of up to ± 150.0-200.0 meters, equipped with equipment such as: mud pumps, a series of equipment that cannot be separated from one another. For well logging an Electrical logger is used for geophysical wellbore investigations. For the work of washing wells using compressor and other supporting equipment. Pumping the test uses a submersible pump that has a minimum discharge capability of 10 lt / sec and a maximum of 20 lt / sec. The results of direct observations and measurements of the physical parameters of the Sembiran Village Drilling Well (SEM-5) contain TDS = 219.; PH = 7.0. Chemically, Iron (Fe) = 0.001 mg/ltr; Arsenic (Ar) = 0.067 mg/ltr; Availability (CACO3) = 56.4 mg/ltr; Chloride (Cl-) = 91.6 mg/ltr; Nitrate (N) = 0.013 mg/ltr; Sulfate (SiO4) = 1.88 mg); Lead (Pb) = 0 mg/ltr; organic matter (KMnO4) = 0.34 mg/ltr, so the Drilling wells (SEM-5) meet clean water quality standards based on the Regulation of the Minister of Health of the Republic of Indonesia Number 492 / Menkes / Per / IV / 2010. Discharge obtained from pumping test results at SEM-5 wells is 20.47 liters/sec with surface water level(swl) = 23.60 m, and the position of the pump is placed at 42 m from the ground surface. Keyword : Groundwater drilling, water quality, pumping test I. INTRODUCTION The growing population growth today, especially the growth of rural populations due to economic development, it is deemed necessary to have an irrigation facility that can support the improvement of the people's agricultural sector both from surface irrigation or rain-fed irrigation sourced from underground water. The obstacle faced in the use of ground water as a source of water through rholes is if the extraction / pumping of ground water as irrigation water is not controlled, it can cause damage to the groundwater system that impacts on environmental damage such as groundwater pollution due to the entry of inland sea water (if the location is close to the beach). Sembiran Village, located in Tejakula Subdistrict, Buleleng Regency, still needs ground water for agricultural land due to drought, due to the limited surface water that can flow through the land in the area. The alternative to meet the water needs of rainfed irrigation is by taking underground water by drilling deep wells. In order to achieve the above objectives, it is advisable to carry out monitoring and integrated monitoring periodically, both in quality and quantity, as well as the need for monitoring wells that can later monitor groundwater level fluctuations, so that underground water management can run well (adjusted to local hydrogeological conditions). From the results of the drilling, it is expected that the quality and quantity of water can be utilized as raw water or agricultural irrigation in the area. II. \ LITERATURE REVIEW A. Definition of Groundwater Ground water is water that moves in the soil that is in the soil between the soil grains that seep into the soil and combine to form a layer of soil called an aquifer. Layers that can pass water easily are called permeables, such as layers of- sand or gravel. Layers that do not escape water are called impermeable, such as clay or clay. The layer that can capture and escape water is called an aquifer [12].