Assessment of groundwater vulnerability in the Daule aquifer, Ecuador, using the susceptibility index method

One of the negative impacts of settlements and urbanization is the decline in groundwater quality. In maintaining the sustainability of groundwater for a long period of time, a special study is needed, which can be done by examining groundwater vulnerability. The alluvial plain of Semarang City currently faces environmental problems such as degradation of groundwater quality which is the negative impact of the settlement, The purpose of this study was to examine groundwater vulnerability in the alluvial plain area of Semarang City. The Susceptibility Index method is using a spatial analysis tool based on rating and weighting value of some parameters, i.e. Depth of groundwater, recharge, aquifer media, slope, and land use. The result of this research reveals that about 41.3% area is covered under the high vulnerable zone, 50.3% area under moderately vulnerable zone and 8.4% area under the low vulnerable zone. 7 sub districts namely Tugu, Semarang Barat, Semarang Utara, Semarang Timur, Gayamsari, Pedurungan and Genuk, most of which are in the high vulnerability zone. Whereas the Ngaliyan, Semarang Selatan, Semarang Tengah, Candisari, and Gajah Mungkur, which are mostly in the low to moderate vulnerability zones.

Download Full-text

Application of a GIS-based DRASTIC model and groundwater quality index method for evaluation of groundwater vulnerability: a case study, Sefid-Dasht

Water Science & Technology Water Supply ◽

10.2166/ws.2015.032 ◽

2015 ◽

Vol 15 (4) ◽

pp. 784-792 ◽

Cited By ~ 3

Author(s):

Nastaran Khodabakhshi ◽

Gholamreza Asadollahfardi ◽

Nima Heidarzadeh

Keyword(s):

Groundwater Quality ◽

Quality Index ◽

Major Ions ◽

Groundwater Vulnerability ◽

Vulnerability Index ◽

Aquifer Vulnerability ◽

Index Method ◽

Drastic Model ◽

Groundwater Quality Index ◽

The North

Pollution control and removal of pollutants from groundwater are a challenging and expensive task. The aims of this paper are to determine the aquifer vulnerability of Sefid-Dasht, in Chaharmahal and Bakhtiari province, Iran, using the DRASTIC model. In addition, the groundwater quality index (GQI) technique was applied to assess the groundwater quality and study the spatial variability of major ion concentrations using a geographic information system (GIS). The vulnerability index ranged from 65 to 132, classified into two classes: low and moderate vulnerability. In the southern part of the aquifer, the vulnerability was moderate. Furthermore, the results indicate that the magnitude of the GQI index varies from 92% to 95%. This means the water has a suitable quality. However, from the north to the south and southwest of the aquifer, the water quality has been deteriorating, and the highest concentration of major ions was found in the southwest of the Sefid-Dasht aquifer. A comparison of the vulnerability maps with the GQI index map indicated a poor relation between them. In the DRASTIC method, movement of groundwater is not considered and may be the reason for such inconsistency. However, the movement of groundwater can transport contaminants.

Download Full-text

GROUNDWATER VULNERABILITY ASSESSMENT OF SYLHET SADAR USING GIS

Malaysian Journal of Civil Engineering ◽

10.11113/mjce.v32.16182 ◽

2020 ◽

Vol 32 (2) ◽

Author(s):

Md. Ashikur Rahman ◽

Md. Jahir Alam

Keyword(s):

Water Depth ◽

Vulnerability Assessment ◽

Sustainable Use ◽

Groundwater Vulnerability ◽

Hazard Map ◽

Index Method ◽

Management Planning ◽

Water Index ◽

Index Approach ◽

Groundwater Vulnerability Assessment

Groundwater has been treated as a vital water supply because of its comparatively low vulnerability to pollution compared to surface water. Due to the health and economic impacts of groundwater contamination, steps to measure groundwater vulnerability are necessary for sustainable groundwater protection and management planning. In this study, an attempt has been made to assess groundwater vulnerability using the overlay index method and to prepare a groundwater vulnerability map using Geographic Information System (GIS) of Sylhet Sadar, a northeastern region of Bangladesh. Also, for the water depth-wise vulnerability assessment, the Water index was generated to observe the effect on chemical concentration for the depth of water. By assigning weight to each pollutant map in the overlay index approach, a combined hazard map was successfully created. The combined hazard map shows a total of 16.04%, 41.36%, and 42.59% of the studied area located in a less, moderate, and severely vulnerable zone, respectively. The combined effect of the chemical concentrations of water gradually decreases with the increase in water depth. Therefore, the developed map can be used as a tool for the management to take initiatives for sustainable use of groundwater.

Download Full-text

Contribution of a Geographic Information System to Assess the Vulnerability to Groundwater Pollution of the Free Water Table from the Oued Souf Region (South-East Algeria)

Civil and Environmental Engineering Reports ◽

10.2478/ceer-2021-0031 ◽

2021 ◽

Vol 31 (3) ◽

pp. 1-17

Author(s):

Fayçal Khelfaoui ◽

Lamine Sayad ◽

Badra Attoui ◽

Boualem Bouselsal ◽

Salah Ghezaili

Keyword(s):

Information System ◽

Geographic Information System ◽

Water Table ◽

Groundwater Pollution ◽

Free Water ◽

Geographic Information ◽

Aquifer Vulnerability ◽

Index Method ◽

Susceptibility Index ◽

Very High

Abstract The Oued Souf free aquifer located in the South East of Algeria represents the main water resource used mostly for urban and agricultural activities. The intensive use of chemical fertilizers has led to serious environmental problems such as contamination of the free aquifer in the region. Thus, aquifer vulnerability has been assessed using several different methods (DRASTIC, GOD, and the Susceptibility Index ‘SI’) based on a geographic information system (GIS). For each method, two vulnerability maps have been developed in the years 2002 and 2012. These maps show that the study area is more exposed to urban, and especially agricultural, pollution. Two classes of vulnerability (moderate and high) have been identified by both DRASTIC and GOD methods. A combined analysis reveals that the moderate class showing 48% (for the GOD method), and the high class showing 57% (for the DRASTIC method) are the most dominant. However, the Susceptibility Index method (SI) revealed that the vulnerability varies from moderate to very high-level classes. In 2012, about of 53% of the study area was dominated by moderate vulnerability classes. The high vulnerability class also includes a considerable part of the land (41%) around urban or strongly agricultural areas, while only 6% is under very high vulnerability groundwater contamination. In addition, a marked decrease in the vulnerability level was noticed in 2012 compared to 2002. This decrease is mainly due to the lowering of the water table after the installation of a vertical drainage network to evacuate the surplus water to the depression and Chotts areas in the North of the region. These results provide a guide for decision-makers involved in the protection of groundwater pollution in such a vulnerable area.

Download Full-text

Assessment of Groundwater Vulnerable Zones of Nagpur City Using DRASTIC and Susceptibility Index Method

Environmental Processes and Management - Water Science and Technology Library ◽

10.1007/978-3-030-38152-3_21 ◽

2020 ◽

pp. 397-411

Author(s):

Sahajpreet Kaur Garewal ◽

Avinash D. Vasudeo ◽

Aniruddha D. Ghare

Keyword(s):

Index Method ◽

Susceptibility Index ◽

Vulnerable Zones

Download Full-text

Groundwater vulnerability to pesticide pollution assessment in the alluvial aquifer of Western Bengal basin, India using overlay and index method

Geochemistry ◽

10.1016/j.chemer.2020.125601 ◽

2020 ◽

Vol 80 (4) ◽

pp. 125601 ◽

Cited By ~ 2

Author(s):

Srimanti Duttagupta ◽

Abhijit Mukherjee ◽

Kousik Das ◽

Avishek Dutta ◽

Animesh Bhattacharya ◽

...

Keyword(s):

Pollution Assessment ◽

Groundwater Vulnerability ◽

Alluvial Aquifer ◽

Bengal Basin ◽

Index Method ◽

Pesticide Pollution

Download Full-text

A Modified AVI Model for Groundwater Vulnerability Mapping: Case Studies in Southern Italy

Water ◽

10.3390/w14020248 ◽

2022 ◽

Vol 14 (2) ◽

pp. 248

Author(s):

Daniela Ducci ◽

Mariangela Sellerino

Keyword(s):

Southern Italy ◽

Groundwater Vulnerability ◽

Aquifer Vulnerability ◽

Data Availability ◽

Physical Parameters ◽

Time Dimension ◽

Index Method ◽

Vulnerability Index Method ◽

Hydrogeological Characteristics ◽

Groundwater Vulnerability Mapping

Many methods for evaluating the aquifer’s vulnerability to pollution have been developed in the past four decades by using geographic information system (GIS) tools. However, even if the aquifer vulnerability concept is well defined and the methods have been constantly tested and compared, the problem of the choice of the best “standard” method remains. To meet these objectives, aquifer vulnerability maps are of crucial importance. The choice of method depends on several factors, including the scale of the project, the hydrogeological characteristics of the area, and data availability. Among the many methods, the AVI (Aquifer Vulnerability Index) method has been widely used as it considers only two physical parameters. The AVI Index represents the hydraulic resistance of an aquifer to vertical flow, as a ratio between the thickness of each sedimentary unit above the uppermost aquifer (D, length), and the estimated hydraulic conductivity (K, length/time) of each of these layers. The AVI Index has a time dimension and is divided into five classes. In order to avoid a widespread presence of the higher vulnerability classes, especially in shallow aquifers, the AVI classification has been modified using statistical methods. The study reports the application of the modified AVI method for groundwater pollution vulnerability, in three different areas of southern Italy, highlighting the limitations of the method in alluvial aquifers and the differences with other methods.

Download Full-text