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Assessment of Groundwater Quality and Associated Hazard Identification in the Betagi Paurashava, Barguna District, Bangladesh

Dhiman Kumer Roy*
Department of Geology and Mining, University of Barisal, Kornokathi, Barishal-8200.

Md. Abdur Rahim
Department of Disaster Resilience and Engineering, Faculty of Disaster Management, Patuakhali Science and Technology University, Dumki, Patuakhali-8602.

Uddipon Roy
Department of Disaster Resilience and Engineering, Faculty of Disaster Management, Patuakhali Science and Technology University, Dumki, Patuakhali-8602.

Sukhen Goswami
Department of Geology and Mining, University of Barisal, Kornokathi, Barishal-8200.

AKM Mostafa Zaman
Department of Agronomy, Faculty of Agriculture, Patuakhali Science and Technology University, Dumki, Patuakhali-8602.

Narantuya Purevjav
Department of Geology and Hydrogeology, Mongolian University of Science and Technology, Mongolia-1419

Abstract/ Executive Summary:

Betagi Paurashava is situated in the coastal areas of Bangladesh and vulnerable to many disasters like cyclone, saline water intrusion, tidal flood, water quality hazards etc. Coastal areas of Bangladesh are suffering from the scarcity of safe drinking water that directly related to health issues. This study was carried out based on both primary and secondary data from different relevant sources and associated hazards had identified using field survey data analysis. The soil of the study area belongs to the group of coastal saline zone. The hydrostratigraphy and spatial distribution of bore logs at Betagi reveal that the groundwater aquifer system is in a critical condition with less yielding capacity of drinkable water. The aquifer material is composed of very fine to fine sand with medium sandy layer. The chemical parameters of groundwater (mainly Fe, As, Mn and Cl) were analyzed at the laboratory of the Department of Public Health Engineering (DPHE) and assessed from primary as well as secondary data sources. Analysis of all data and correlation with the field survey questionnaires, it is found that the water quality is worsening day by day in Betagi area. The amount of chloride (Cl) is in very vulnerable condition with an increasing rate. The overall groundwater quality varies from year to year. Arsenic (As) and Manganese (Mn) is about out of risk. However, Iron (Fe) and salinity is in high risk. As a result of increasing salinity, the community peoples are facing challenges like production losses, irrigation problems, soil erosions, infrastructure damages etc. For solving water related problems regular monitoring of groundwater withdrawal and consumptive uses, quality assessment and control as well as enhancement of research is recommended.

Keywords: Salinity intrusion, Groundwater quality, Quality assessment, Iron concentration

Location: Betagi Paurashava, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Groundwater

Objectives:

This study provides a brief status of groundwater chemistry, water quality and associated risk in the coastal area at Betagi Paurashava, Barguna.

Methodology:

Primary Data Collection: A detailed field survey was carried out at southwestern coastal areas at Betagi Paurashava. During field survey, 18 tube wells location were visited several time and interview data collected from the owner of the tube well. Global Positioning System (GPS) machine was used to obtain the exact location of the individual tube wells. The field investigated area with the well locations. Personal Interview For personal interview, a total number of 36 (both men and women) were interviewed in the study area. A semi-structured questionnaires were used to collect data from well owners to know their drinking water sources, water related problems, health problems due surface water use, water logging and logging period in surrounding areas as well as water borne diseases and water management procedures etc. The interview were designed considering government, NGO and private tube well ownership. Focus Group Discussion Using qualitative approach, one focus group discussion was conducted which helps to gather a wide range of information in a relatively short time. The participants were men and women of various professions to get the information about quality of surface and groundwater and related hazards, sources of drinking water, health risk and for requirements for water quality treatment plant etc. Secondary Data Sources Secondary water quality (1995-2013) and borelog data were collected from the Bangladesh Water Development Board (BWDB), Institute of Water Modelling (IWM), Department of Public Health Engineering (DPHE), and Japan International Cooperation Agency (JICA). Water quality information was extracted from evaluation and interpretation of those data. The borelog and water quality data were analyzed by using IWM customized software.

Source of Information: Barisal University Journal Part 1, 4(2):361-376 (2017)

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This paper presents the groundwater quality assessment carried out for the coastal area at Betagi Paurashava. Assessment of the concentration of iron, arsenic, manganese and chloride in groundwater for drinking, domestic and other purposes and the identification of associated hazards. Latest concentration(mg/L) of arsenic, iron and manganese are 0.01, 0.88 and 0.09 which are in allowable limit according to Bangladesh Drinking Standards for drinking purposes but the value of Chloride 584(mg/L) is vulnerable and concern issue for drinking, domestic and crop production purposes in the recent years at Betagi Paurashava and its surrounding areas. The assessment of Chloride (Cl) from 1995 to 2013 is the clear indication of increasing salinity in the study area in alarming rate. So, water quality parameters are changing day by day and water related hazards are mounting high throughout the country with a greater concentration of Fe, Mn, As and Cl.

Knowledge Management: Journal