Estimation of Aquifer Hydraulic Parameters and Operational Discharge of Raw Water in Woyla District, West Aceh District, Aceh Province

Khalif Alfaiz; Agus Mochamad Ramdhan; Irwan Iskandar

Khalif Alfaiz Groundwater Engineering Master Program, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jalan Ganesa 10, Bandung 40132, Indonesia
Agus Mochamad Ramdhan Groundwater Engineering Master Program, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jalan Ganesa 10, Bandung 40132, Indonesia
Irwan Iskandar Applied Geology Expertise Group, Faculty of Earth Sciences, Bandung Institute of Technology, Jalan Ganesha No. 10, Bandung 40132, Indonesia

Keywords: aquifer, conductivity, discharge, flux, groundwater, transmissivity

Abstract

Groundwater is one of the most important natural resources because it fulfills the needs of daily life, agriculture, irrigation and industry. Population growth and regional development also increase the demand for and service levels of drinking water, which requires management of water distribution. According to reports, 25 villages in Woyla district are still facing water shortages and the water debt to meet this need is around 559,800 L/day. In terms of regional geology, the study area includes young floodplain strata consisting of silt deposits, sandy loam, fine sand, and coarse sand. The geoelectric method is a method for studying the nature of current flow in the earth according to the laws of electricity. The power log is a recorder for SP and resistivity is a record that must be kept at each well formation interval. The pumping test is the stage of testing the runoff capacity and physical parameters of the aquifer before the production stage is carried out on the well. The average MAT of the three villages is 2.26 meters from north to south. According to geoelectrical data GL7, GL8, GL9, GL10, GL11 and GL12, the resistivity of the sandy aquifer ranges from 59 – 809 ohm.m and a total thickness of 99 m. Cot Punti Village 430.27 m3/day, Jawi Village 473.27 m3/day and Alue Village 477.52 m3/day Well efficiency is 95.3 when using the Hantush-Bierschenk method (1964) assuming the average value of Cot village Punti processed test data for the multi-stage discharge pump %, which was 89.73% in Jawi village and 99.97% in Alue village, so that pumping was still effective. The average well efficiency based on the Ghost Bierschenk method is 94.9%, 1.76 m3/day for Cot Punti village, 3.73 m3/day for Jawi village and 3.66 m3/day for Alue village. The transmission rate is 56.5 m²/day in Cot Punti village, 149.4 m²/day in Jawi village and 88.1 m²/day in Alue village. Woyla District has a resource load of 1,380,000 liters/day.

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