Abstract
Hydrogeological surveys have been carried out in the Borobudur area and its surroundings, the northern part of the West Progo Hills to the Magelang intermountain plains. The purpose of this study is to determine the variations in groundwater’s chemical types in the study area and to interpret the hydrochemical processes. Primary data was taken in the field, including groundwater data and rock petrology. Physical / chemical data of groundwater were obtained from laboratory test results. Data analysis includes hydrochemical analysis using the Stiff, Piper, and Durov diagrams. The result shows that groundwater in the study area has a wide variety of chemical types, namely Ca, Mg - bicarbonate; Ca, Mg, alkaline – bicarbonate; Alkaline, Ca – chloride, and Alkaline - chloride. Groundwater in the study area is fresh (type Va) to brackish (type Vc), with low -moderate TDS content (119 - 6,810 ppm), and soft calcium carbonate hardness (6.0 - 16.6 ppm). Hydrochemical processes occur in groundwater are simple dissolution and cation exchange caused by clay materials originating from Quaternary deposits or weathering of Old Andesite Formation volcanic breccia. In addition, the presence of brackish water in Karangrejo and Candirejo may be triggered by mixing with fossil water.
Highlights
The research area is located in Borobudur and its surroundings, Magelang Regency (Fig. 1), which is included in the southern part of the Mungkid sheet map
The northern research area is included in the physiography of the Java central depression or intra mountain of the Quaternary volcano, while the southern part is included in the West Progo Hills [1]
Groundwater in the study area has a cation element that varies from one place to another, with the dominant anion of bicarbonate or chloride
Summary
The research area is located in Borobudur and its surroundings, Magelang Regency (Fig. 1), which is included in the southern part of the Mungkid sheet map. The northern research area is included in the physiography of the Java central depression or intra mountain of the Quaternary volcano, while the southern part is included in the West Progo Hills [1]. West Progo Hills physiography is a non-groundwater basin region [2]. In this area, groundwater can be found with varying quantity and quality. Groundwater quality shows variations from fresh to brackish. This varying quality of groundwater is characterized by different types of groundwater chemistry
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