Assessment and Groundwater Suitability for Agriculture Purposes, Case Study of South Oued Righ Region; Southeast of Algeria
Abdelaziz Kadri 1  
,   Kais Baouia 1  
,   Samir Kateb 1  
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Department of Civil and Hydraulic Engineering, University of Kasdi Merbeh, Ouargla 30000, Algeria
Abdelaziz Kadri   

Department of Civil and Hydraulic Engineering, University of Kasdi Merbeh, Ouargla 30000, Algeria
A total of 72 groundwater samples were collected from Wells at Touggourt region or as its named Righ valley, aimed at assessing the suitability of groundwater for agricultures. Groundwater samples were analyzed for their physical and chemical properties using standard laboratory methods. Physical and chemical parameters of groundwater such as pH, electrical conductivity, total dissolved solids, Na, K, Ca, Mg, Cl, HCO3, and SO4 were determined. Various water quality indices like SAR, SSP, PI, RSC, MHR and KR have been calculated for each water sample to identify the irrigational suitability standard. Using irrigation water quality index (IWQI) method with the help of the Geographical Information System (GIS) technique. Five chemical parameters were used including Electrical Conductivity (EC), Cl, HCO3, Na % and Sodium Absorption Ratio (SAR) to create the database of water quality. These parameters have been inputted to the GIS platform to produce a spatial distribution map for each parameter using the inverse interpolation technique (IDW). These parameters were used to calculate water quality index values which were also reassigned to the GIS environment to generate the IWQI maps. The map results showed that 35% of the studied samples fall in Severe Restriction (SR) categories indicating that they should be avoided and not utilized for irrigation under ordinary situations. 65 % of the groundwater was found is classified as having a high restriction for usage, which indicates it can be used in soils with high permeability without dense layers and requires just minor salt leaching to avoid harming plants.