Hydromorphology of the Unconfined Groundwater in the South of Klaten District (Data Before Earthquake Mei 27th 2006)

Abstract

There are some characteristics and distributions of unconfined groundwater variation in the research area. Those are related to a system of water supply and consumptive use for drinking water. Variation of the groundwater characteristic depends on variation of morphology. Therefore, it is needed to delineate hydromorphology units of the regions as a base on groundwater resources management, especially for drinking water. The aims of the research are: (1) to study of the characteristic and distribution of unconfined groundwater variations base on landform units, (2) to study the factors that affect such variations, and (3) to establish the hydromorphology units of the regions for groundwater resources management, especially for drinking water. The method used in this research is landform approach and field survey. The sampling method is stratified sampling, based on landform as the analysis approach. Result of the research shows that there are some variations of groundwater characteristic at each landform. Landforms which have good groundwater characteristic are Hydromorphology Unit of Fluvio Volcanic Plain of Young Merapi (except Bayat region) and Hydromorphology Unit of Volcanic Foot Plain of Young Merapi. At those units, there are good quality of groundwater, bicarbonate water (hydrochemical type I), having low electric conductivity, shallow of water table, low in fluctuation, and middle to fast class in aquifer permeability. Those units are the most potential unconfined groundwater resources management for drinking water. The units which have poor groundwater characteristic are Hidromorphology Unit in Bayat Region, including Undulating Alluvial Plain, Fluvio Volcanic Plain of Young Merapi, and Swamp Alluvial Plain. Generally, the groundwater quality is medium to poor, the hydrochemical type is Va (initiation process of connate water) and type III (evaporate water), shallow up to medium of water table, and low to middle class of aquifer permeability. The taste of groundwater is brackish to saline with high concentration of chloride.

Identifikasi Jebakan Airtanah Asin Menggunakan Pendugaan Geolistrik di Kecamatan Wonosegoro, Kabupaten Boyolali

“…Seperti yang kita ketahui bahwa setiap wilayah memiliki kualitas air yang berbeda-beda, hal ini membuktikan bahwa tidak semua kondisi airtanah bisa digunakan untuk memenuhi kebutuhan manusia. Santosa (2006) berpendapat bahwa, lima hal yang dapat mempengaruhi karakteristik dari airtanah, yaitu: (i) genesa pembentukan bentuklahan; (ii) kondisi lingkungan pengendapan; (iii) komposisi mineral yang terkandung di aquifer; (iv) proses dan pola aliran airtanah; dan (v) waktu tinggal airtanah di dalam aquifer. Dari karakteristik tersebut, sifat atau karakteristik airtanah yang terdapat di Kecamatan Wonosegoro yaitu airtanah yang memiliki rasa asin atau bersalinitas tinggi.…”

“…Kondisi airtanah yang berbeda-beda di setiap wilayah menjadikan tidak semua airtanah dapat digunakan untuk konsumsi manusia. Menurut (Santosa, 2016), terdapat lima hal yang dapat mempengaruhi karakteristik airtanah, yaitu: (i) asal mula pembentukan bentuklahan; (ii) lingkungan pengendapan; (iii) komposisi mineral dari aquifer; (iv) proses dan pola aliran airtanah; dan (v) waktu tinggal airtanah di dalam aquifer. Salah satu sifat airtanah yang menarik untuk dikaji adalah airtanah dengan kadar salinitas tinggi atau airtanah asin.…”

The analysis of spring potency for domestic uses (Case study: Wanadadi Sub-district, Banjarnegara-Indonesia)

“…Also, the slope where the springs emerge is fairly steep, and their discharges were measured in dry months (August-September) where there is normally a decline in groundwater recharge (seasonal factor). Therefore, despite the small discharge, all springs have been classified as perennial flows.Specific geological structures like faults and fractures are known factors of spring discharge [11]. However, because these geological structures are not found in the study area, their influence is negligible.…”

Groundwater Characteristics and Their Associations with Paleogeomorphological Dynamics in Gantiwarno, Klaten Regency, Central Java Province, Indonesia; A Preliminary

“…The fluvial process also flattens Gantiwarno area. According to (Santosa, 2006), four landforms can be found in Gantiwarno: Alluvial Wavy Plains, Flood Plains, Foot Plains of Baturagung Hills, and Alluvial Fan of Baturagung Hills.…”

“…The Square Piper Diagram method is aimed more at analyzing the genesis and the main geomorphological processes that form the hydrogeochemical types of groundwater. The analysis process using this method requires data on the percentage of Na+ + K+ compared to the total cations as the abscissa, and the percentage of Cl-+ SO 2-compared to the total anions as the ordinate [27].…”