Abstract
Assessment of groundwater pollution risk is purposed to be of particular value for environmental management programs development, this research estimated and calculated of groundwater pollution risk potential in Yogyakarta City using DRASTIC Model, DRASTIC parameters developed as Depth to water (D), net Recharge (R), Aquifer media (A), Soil media (S), Topography (T), Impact of vadose zone (I), and Hydraulic conductivity (C), the weights and ratings assigned in this research were similar to the typical ratings suggested in the original Methode. The result final assessment that groundwater pollution risk potential are classifies 4, 27% of the area as having very low, 15, 12% of the area as having low, 20, 17 % as having moderate, 43, 10% as having high, and 17, 34% as having very high. The model was validated using E. Coli parameters as a represent of pollution risk where the results having exceeds 85% of total samples that a value exceeds from the standard of quality > 0 MPN/100 ml. However, this research is a preliminary to be continued in the further research.
Highlights
Yogyakarta city is an urban environment area in Indonesia, the population growth will increase from 422,732 people to 500,000 in 2030 with an average population growth of 1.04% [1]
An overview of DRASTIC parameters develop where is each parameter as Depth to water (D), net Recharge (R), Aquifer media (A), Soil media (S), Topography (T), Impact of vadose zone (I), and Hydraulic conductivity (C) processed in the GIS is described below
The lithological represents aquifer media were determined by Yogyakarta formation, which is a result of Merapi Volcano ejecta in Quaternary succession and composes of sand, gravel, silt and clay and Sentolo Formation, occurred in Tertiary succession and consists of marl, Term soil type for initial S, This paramater refers to represents that media the contaminant passes through when it percolates into vadose zone in the aquifer
Summary
Yogyakarta city is an urban environment area in Indonesia, the population growth will increase from 422,732 people to 500,000 in 2030 with an average population growth of 1.04% [1]. Based on population and number of tourists, that can be implied that the number of people reached 1 million for the average mobility of people for a month. This number given the significant development of urban developments in the city of Yogyakarta, it is necessary to evaluate comprehensive the changes in the urban environment in Yogyakarta City and ensure the sustainability, especially the quality of groundwater. Dynamics of environmental quality can be evaluated especially the quality of groundwater by DRASTIC method, as like similar index. The method can significantly be deployed to make regional or area scale assessment of groundwater vulnerability as screening how potential groundwater pollution risk is in research area
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