DBPapers
DOI:10.5593/SGEM2013/BC3/S12.040

STUDIES UPON THE GROUNDWATER QUALITY INDEX OF THE AQUIFER FROM BARLAD MIDDLE BASIN

I. G. Breaban, M. Paiu, P. Cojocaru, I. Cretescu
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Water Resources. Forest, Marine And Ocean Ecosystems, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-619-7105-02-5 / ISSN 1314-2704, June 16-22, 2013, 317 - 324 pp

ABSTRACT

In our century, one of humanity’s most overwhelming problems is the water crisis. Despite the fact that water is a renewable natural resource, its availability is limited and extremely vulnerable, requiring urgent actions to preserve the natural reserves. Romania’s water resources are relatively scarce, meaning roughly 1700 m3/capita/yearof water, while in other European countries these reserves are, in average, 2.5 times higher. Groundwater is an important resource for obtaining potable water, due to its physico-chemical and biological characteristics, but being less visible, its assessment is difficult. In 2011, at the national level the existing water resource was 39 270 803 000 m3, from which usable groundwater resource meant only 5 411 322 000 m3. The currentstudy area concerns the management of water body ROPR03 - meadow and the terraces of Barlad River, developed over a large area, characterized by a large variation of aquifer chemistry and different paragenesis.
The assessment of groundwater quality by calculating the Groundwater Quality Index (GWQI) is an easy way to integrate the results from the monitoring of the evolution of water quality indicators in planning the optimal use of the water resources in connection with the land use for different activities.
This study aimed to identify several groundwater drinking water sources using a simple methodology based on GIS techniques to analyze the level of the most important indicators from 25 groundwater sources. The monitored indicators were: the electrical conductivity, the pH, major anions (HCO3-1, SO4-2, Cl-1, NO3-1, PO4-3), major cations(Na+1, K+1, Ca+2, Mg+2) and trace elements (Crtot, Mn+2, Fetot, Ni+2, Cu+2, Zn+2, Pb+2).For GWQI, in the first stage, the quality ranking using weighted Arithmetic Index method and the quality rating/sub index corresponding to each indicator was calculated; in the second stage GWQI was calculated by aggregating linearly the quality rating with unit weight (also corresponding to each indicator). In the GIS software, each of these indicators can be considered a data layer; the GWQI map revealed that only 40-53 % of the investigated groundwater sources are relatively high-quality groundwater, the other sources are not suitable for drinking water supply, especially due to the presence of nitrate, chlorine and iron.
The use of this index as an aggregation and communication tool can be extremely useful for all authorities involved in the water resources management.

Keywords: Groundwater Quality Index, drinking water quality, middle Barlad basin