ASSESSMENT OF SALINITY HAZARD OF THE IRRIGATION WATER OF GOPALGONJ DISTRICT, BANGLADESH
|Mashura Shammi1,2*, Rashadur Rahman1, Bikash Karmakar1, Md. Mostafizur Rahman1,3, Md.Moniruzzaman4, and M. Khabir Uddin1
|Corresponding Author: Mashura Shammi, Tel. +8613716177314 ,E-mail: [email protected]|
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The specific objectives of the present research were to analyze the hydrochemistry of surface water and groundwater of the study area and to classify the salinity hazard of water resources from different sources of Gopalganj district in order to evaluate the suitability for irrigation purposes. A total of 21 samples were collected from surface water (canal, ponds and river), and groundwater samples from shallow tube well (STW) deep tube well (DTW). Important parameters were analysed to identify salinity hazard of irrigation water like EC, Total hardness (TH), important anions Cl¯, SO42¯ and PO43¯ were determined along with important cations Ca2+, Mg2+ , Na+ and K+ . Both surface and groundwater of the study area maintained the trend of Cl¯ > SO42¯ > PO43¯. The cation trend in both surface and groundwater of the study area were Na+ > K+ > Ca2+ > Mg2+. The elevated Electrical conductivity (EC), Cl− and high content of Na+ relative to Ca2+, Mg2+ and K+ samples suggest their saline origin. While Total hardness, and SAR, soluble sodium percentage (SSP) and other important analysis indicated that most of the surface water and DTW samples were not suitable for irrigation. Plotting from Wilcox diagram evidenced that most of the surface water especially river water and DTW of the study area had higher SSP values greater than 80 indicating a threat of salinity hazard. Among the surface water samples, 2 (25%) fell under “good” class, 2 (25%) fell under “fair” class and 4 (50%) fell under “poor” class. Among the STW water samples, 4 (40%) fell under “good” class, 4 (40%) fell under “fair” class and 2 (20%) fell under “poor” class indicating suitability.