Abstract

• The study area is located between in the west of the Sittaung River and eastern parts of the Bago Yoma. It is lying between North Latitude 18º 24´ to 18º 30´ and East Longitude 96º 27´ to 96º 30´. The total coverage of the area is approximately 2322.42 square kilometers. Total population of the research area is about 257,273 (2019 Cencus). The drainage pattern of the study area is dendritic and parallel pattern. According to the pattern, the bedrock of the study area is shale and sandstone. Alluvial aquifer mainly composed of the research area. Alluvial aquifer mainly composed of the blue clay, blue sand, blue sandy clay and sand with gravel in some place. According to the well log data, its thickness is varying from 90-160 feet in one place to another. At well no.16, the groundwater yield from this unit is about 500 to 800 gallons per hour (gph) from 2" diameter tube well. The collected samples are analyzed at the Water Resources and Utilization Department (W.R.U.D) and Ministry of Agriculture and Irrigation Department, the cations and anions and TDS, EC, pH, total alkalinity and total hardness. According to the Piper method, water types can be classified by 3 types. There are Sodium Chloride, Calcium Chloride and Mix types. The pH values of water samples are ranging from 7.95 to 8.6. The electrical conductivity (EC) of groundwater samples is ranging from 210 to 800 µmhos/cm. TDS concentration is ranging from 120 ppm to 520 ppm. Sodium concentration is ranging from 5 ppm to 45 ppm. Calcium concentration is ranging from 9 ppm to 48 ppm and does not exceed the W.H.O standard (2011) of 200 mg/L. The value of iron in the research area is ranging from 0.0 ppm to 4.5 ppm. Bicarbonate concentration in the research area is ranging from 20 ppm to 92 ppm. The concentration of sulfate in the research area is ranging from 8 ppm to 70 ppm. The results of chemical data analyzed by the SSP% method, the SAR method and the MAR method show that some tube wells can be assessed suitable for use as irrigation water. According to the above methods and the WHO Drinking Water Standard, the data can assess whether the groundwater of the research area is suitable for drinking water, domestic use, and irrigation water, except that some tube wells are not suitable.