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Assessment and Mapping of Groundwater Quality for Irrigation and Drinking in a Semi-Arid Area in Algeria

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Assessment and Mapping of Groundwater Quality for Irrigation and Drinking in a Semi-Arid Area in Algeria Journal of Ecological Engineering Journal of Ecological Engineering 2021, 22(8), 19–32 Received: 2021.06.16 https://doi.org/10.12911/22998993/140369 Accepted: 2021.07.24 ISSN 2299-8993, License CC-BY 4.0 Published: 2021.08.06 Assessment and Mapping of Groundwater Quality for Irrigation and Drinking in a Semi-Arid Area in Algeria Mohamed Azlaoui1*, Aziez Zeddouri2, Nadjib Haied3, Imed Eddine Nezli4, Atif Foufou3 1 Department of Civil Engineering and Hydraulic, Ziane Achour University of Djelfa, Djelfa 17000, PO Box 3117, Algeria 2 Laboratoire des Réservoirs Souterrains: Pétroliers, Gaziers et Aquifères, Université Kasdi Merbah Ouargla, 30000, Algeria 3 Earth & Univers Sciences Departement, Ziane Achour University of Djelfa. Djelfa 17000, PO Box 3117, Algeria 4 Laboratoire de Géologie de Sahara, Université Kasdi Merbah Ouargla, 30000, Ouargla, Algeria * Corresponding author’s email: [email protected] ABSTRACT Groundwater is the main resource used to meet the people’s drinking water and irrigation needs of the Ain Oussera plain, because of the lack of surface-water resources. This paper intended to evaluate the suitability of groundwa- ter for agriculture and drinking in the Ain Oussera plains. The data of the study were gathered and analyzed from twenty (20) groundwater samples collected to assess the plain groundwater quality, using the Water Quality Index (WQI) and GIS, carried out on physico-chemical parameters, including potential of hydrogen (pH), total dissolved solids (TDS) electrical conductivity (EC), potassium (K+), sodium (Na+), magnesium (Mg2+), and calcium (Ca2+) and major anions (Cl, HCO3, NO3, SO4), as well as, the water suitability test for agricultural purposes, using the so- dium adsorption ratio. These parameters were inserted into the GIS platform to create a spatial distribution map for each parameter using the inverse interpolation technique (IDW). The results indicated that the concentrations are within the Algerian permissible limits. The water quality index (WQI), which evaluates the suitability of water for consumption, varies from 31 to 173 with an average value of 81. 70% of the samples from the Ain Oussera plain fall within the excellent and good quality categories. Its water is suitable for consumption (WQI < 100), while 30% is in the poor water category. From the calculation of SAR values, it was found that 90% of the groundwater samples are considered excellent and suitable for irrigation. According to the classification of the United States Salinity Laboratory USSL, the Ain Oussera water quality is classified as poor for irrigation purposes. Keywords: groundwater, drinking water. WQI, irrigation water, SAR, plain of Ain Oussera. INTRODUCTION groundwater resources, the only water reserves for the supply of populations. Water resources are a major concern in dry It is critical to understand the groundwater or semi-dry countries. They are crucial to the de- quality because it is a key mark of its suitabil- velopment of human, economic and social activi- ity for human consumption, agriculture, and/or ties [Ragab et al., 2002b; Williams., 1999; Misra., industry. In recent years, there has been a world- 2014; Wang et al. 2017]. Algeria has adopted a wide increasing concern for water quality. Sev- new policy to protect and safeguard water re- eral studies [Khan et al., 2020; Rao et al., 2012; sources [Negm et al., 2020; Qadir et al., 2007], as Babiker et al., 2007] were conducted to assess the population and urbanization increases, industrial quality of groundwater. units and farm land have resulted in the degra- Groundwater chemistry has been used as an dation of groundwater and surface water quality, instrument for evaluating the quality of water combined with a very significant decline in the for human use and irrigation. [Srinivasamoorthy 19 Journal of Ecological Engineering 2021, 22(8), 19–32 et al., 2014]. The weighted arithmetic method APPROACH AND METHODOLOGY proposed by [Brown et al., 1972] is used to de- termine the appropriateness of drinking water Presentation of the study area quality for domestic, irrigation purposes in the QWI index of water quality. Ain Oussera is a part of the Algerian high This method has been frequently used to as- plains. It is situated in the center of the North of sess the groundwater quality for drinking pur- Algeria, in Djelfa province, between 2°15’ and poses in various regions of the world [Tyagi et 3°45’ East longitude and 35° and 35°40’ North al., 2013; Chauhanet al., 2010; Chowdhury et al., latitude. About 200 km south of Algiers, the plain 2012; Balan et al., 2012; Adimalla et al., 2019; extends over 105 km along a NE- SW axis, and Tiwari, et al., 2018; Kawo et al., 2018]. Similar over 30 km along a perpendicular axis. Its sur- studies have been conducted in Algeria using the face area is approximately 3795 km². It is a flat water quality index [Bouteraa et al., 2019. Rache- or moderately undulated surface. It is bounded by di et al., 2015; Hamlat et al., 2018; Bouslah et al., the mountainous massif of Djebel Remila, Sbaa 2017; Bouderbala., 2017a; Guettaf et al., 2017]. Rous and Oukat El Gharbi and Chergui in the The primary goal of this study was to under- South, by the rectilinear ridges of Koudiat Bou stand the status of groundwater quality in the Ain chakeur and Djebel Es Sersou in the North and Oussera plain, the central steppe of northern Alge- by Oued Touil in the West (Figure 1). The area of ria, characterized by semi-arid climate. This is done the study has a semi-arid atmosphere with a dry by means of mapping the geographic distribution and hot summer and a chilly winter. The average of groundwater quality for irrigation and drinking, precipitation is 226.15 mm/year and the annual in order to identify its suitability for these objec- average temperature is 17.6 °C. The altitude of tives, utilizing the Water Quality Index (WQI) and the Ain Oussera plain varies between 632 m and Geospatial System (GIS) methodologies, carried 900 m. The plain is covered by 08 municipalities out on the basis of the physico-chemical parame- with an estimated population of 449230 inhabit- ters, namely potential of hydrogen (pH), total dis- ants [DPAT 2020]. The groundwater of the plain solved solids (TDS) electrical conductivity (EC), is the main resource of drinking and agriculture major cations (Mg, Ca, K, Na) and major anions water supplies on which most of the population of (Cl, HCO3, NO3, SO4). Moreover, the examination the region depends. The region is pastorally struc- of the suitability of water for agricultural purposes tured, with livestock farming (sheep, goats, and was performed, using the sodium adsorption ratio cattle) being the most prevalent activity. On the (SAR). It was important to determine these fac- agricultural level, the irrigated surfaces lay over a tors in order to evaluate those impacts on human significant surface and are located in the plateau health and agricultural crops. of Sersou and South-West of Birine. Figure 1. Study area 20 Journal of Ecological Engineering 2021, 22(8), 19–32 Geological settings of the area In the Ain Oussera plain, the Albian is con- stituted by permeable continental sandstone. It is The stratigraphic unit sections were obtained the most important and interesting aquifer in the from various deep drillings conducted in the Bou region and is tapped by many boreholes which Cedraa 1200 m and El Khrachem 1100 m areas. would supply the cities and farms with water for This lithostratigraphic description is based on the domestic consumption. Several 100 m to 300 m previous research on the region [Caratini., 1970; deep boreholes capture these sandstones. The Mebrouk et al., 2007; Ayad., 1983]. This infor- flow rates vary from 20 l/s to 75 l/s. The main mation allowed us to provide a comprehensive water flow table is from the South to the North. description of the area geology as well as identify The hydrodynamic parameters are measured the various existing aquifers (Figure 2). Ain Oussera plain appears as a huge anti- using the data from pumping tests conducted in clinorium with a Cretaceous core area, compli- boreholes throughout the study. The high values cated by a system of anticlinals, developed on the of permeability are located in the North-East southern and northern slopes, and its axis pass- (Birine-Ain Oussera) and South-West of the plain, -5 -5 ing through Bou Cedraïa [Azlaoui et al., 2017]. values vary between 2.10 m/s and 43.10 m/s. The plain is covered almost entirely by alluvial On the other hand, the low values are recorded in deposits (Quaternary formations). Cretaceous the South-East and North-West of the study area. formations outcrop on the southern and northern The values are between 0.1.10-5 and 2.10-5 m/s. flanks at Koudiat Es Seguia, El Fia, El Mouilah, Doghmane, and En Nesser [Azlaoui et al., 2017]. Sampling and analysis The samples were taken from 20 groundwater Hydrogeological framework points. The sampling points were chosen to pro- The Ain Oussera plain is home to a wide vide a consistent and uniform distribution across range of aquifer forms with varying hydraulic ca- the entire Ain Oussera. plain (Figure 3). The bottles pacities. These formations are represented by the of samples were rinsed with distilled water. After Quaternary filling, the Miocene sandstones, the 5–10 minutes of pumping, the standing water was limestones of the Lower Eocene, Turonian and removed and the water samples were collected. Cenomanian and the Barremo-Albian sandstones The physical parameters such as pH, total dissolved [Azlaoui et al., 2017]. solids (TDS) and electrical conductivity (EC) were Figure 2. Geological map of the study area 21 Journal of Ecological Engineering 2021, 22(8), 19–32 Figure 3.
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