Integrated assessment of hydrogeology and water quality for groundwater-based irrigation development in the Raya Valley, northern Ethiopia

Ayenew, Tenalem; GebreEgziabher, Merhawi; Kebede, Seifu; Mamo, Sileshi

doi:10.1080/02508060.2013.821640

Cited by 35 publications

(18 citation statements)

References 6 publications

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“…area is characterized by high salinity and significant sodicity which limits irrigation. Ayenew et al (2013) based on Wilcox diagram analysis have also drawn similar conclusions.…”

Section: Analysis Of Sodicity and Salinity Hazards Using Wilcox Diagramsupporting

confidence: 62%

“…the study area. Similarly, Ayenew et al (2013) found that the dominance of Mg 2+ and Ca 2+ in the western side of the study area and Na + dominant water type in the valley floor. As discussed by Ayenew et al (2011); and Gebreegziabher (2012), Na + is dominant in groundwater in central graben especially towards the outlet of the catchment and its concentration reaches up to 11% of the total cations.…”

Section: Hydrochemical Faciessupporting

confidence: 56%

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Evaluation of Groundwater Quality and Suitability for Drinking and Irrigation Purposes Using Hydrochemical Approach: The Case of Raya Valley, Northern Ethiopia

Kahsay

Gebreyohannes

Tesema

et al. 2019

mejs

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Groundwater is a vital source of water for domestic and agricultural activities in Raya valley due to non-perennial flow of surface water.Thus the present study aims to evaluate the groundwater quality and assess its suitability for drinking and irrigation purposes. A total of 137 groundwater samples were examined for various physico-chemical parameters to evaluate the quality and suitability of groundwater for the intended purposes. Piper-Hill diagram was adapted to infer hydro-geochemical facies and water types. The suitability of groundwater for drinking purpose was evaluated by comparing the analytical results of different water quality parameters to the Ethiopian standard as well as World Health Organization Standards (WHO, 2006). Salinity, sodicity and related parameters were considered to evaluate the suitability of the groundwater for irrigation use. The dominant water types are magnesium bicarbonate and sodium-calcium bicarbonate.The hydrochemistry of the groundwater changes from Mg-Ca-HCO 3 dominance at the foot of volcanic hills to Ca-Mg-Na-HCO 3 and Ca-Na-Mg-HCO 3 at the valley floor. On the basis of total hardness, 46 % of the water samples in Raya valley fall in the very hard water class whereas, based on TDS values 95% of the water samples are found to be permissible for drinking. With the exception of three constituents (Mg 2+ , Ca 2+ and K +), all other analyzed constituents in groundwater are within the established standards of Ethiopia. Water suitability for irrigation indicates that the groundwater fall in the range of good to permissible, however, higher salinity, magnesium hazard and low permeability index restricted its suitability in southeastern parts of the study area.

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“…area is characterized by high salinity and significant sodicity which limits irrigation. Ayenew et al (2013) based on Wilcox diagram analysis have also drawn similar conclusions.…”

Section: Analysis Of Sodicity and Salinity Hazards Using Wilcox Diagramsupporting

confidence: 62%

Section: Hydrochemical Faciessupporting

confidence: 56%

Evaluation of Groundwater Quality and Suitability for Drinking and Irrigation Purposes Using Hydrochemical Approach: The Case of Raya Valley, Northern Ethiopia

Kahsay

Gebreyohannes

Tesema

et al. 2019

mejs

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show abstract

“…Groundwater isotope compositions have been applied to evaluate processes and identify recharge sources in many tropical aquifers (Adomako et al, , ; Ayenew et al, ; De Vries et al, ; Fantong et al, , ; Faye et al, ; Gibrilla et al, ; Joshi et al, ; Kamtchueng et al, ; Mukherjee et al, ; Njitchoua et al, , ; Olaka et al, ; Sánchez‐Murillo et al, ; Shamsuddin et al, ; Taylor & Howard, ; Yeh & Lee, ). Evidence is mounting in support of the following hypothesis: that high‐intensity rainfall contributes disproportionately to recharge—that is, recharge ratios of intensive rainfall exceed recharge ratios of less intensive rainfall.…”

Section: Threshold Rainfall Intensities For Rechargementioning

confidence: 99%

Global Isotope Hydrogeology―Review

Jasechko

2019

Reviews of Geophysics

228

124

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Groundwater 18O/16O, 2H/1H, 13C/12C, 3H, and 14C data can help quantify molecular movements and chemical reactions governing groundwater recharge, quality, storage, flow, and discharge. Here, commonly applied approaches to isotopic data analysis are reviewed, involving groundwater recharge seasonality, recharge elevations, groundwater ages, paleoclimate conditions, and groundwater discharge. Reviewed works confirm and quantify long held tenets: (i) that recharge derives disproportionately from wet season and winter precipitation; (ii) that modern groundwaters comprise little global groundwater; (iii) that “fossil” (>12,000‐year‐old) groundwaters dominate global aquifer storage; (iv) that fossil groundwaters capture late‐Pleistocene climate conditions; (v) that surface‐borne contaminants are more common in younger groundwaters; and (vi) that groundwater discharges generate substantial streamflow. Groundwater isotope data are disproportionately common to midlatitudes and sedimentary basins equipped for irrigated agriculture, but less plentiful across high latitudes, hyperarid deserts, and equatorial rainforests. Some of these underexplored aquifer systems may be suitable targets for future field testing.

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“…With the growing ‘anthropization’ tendencies of river basins, there is a need to quantify the salinity of the water resources to avoid the dead ends of salinization and river closures. Some literature exists on the patterns of water salinity in the graben basins: Although Nadew () reported the hydro‐chemical investigation, Ayenew et al () studied the water quality for groundwater‐based irrigation development in the Raya Valley. Recently, Hadera () also highlights that salinization is an emerging challenge for sustainable irrigated agriculture.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal patterns of water salinity in the marginal grabens of Ethiopia's Danakil Depression

et al. 2019

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Rising salinity is a severe problem associated with land degradation in arid and semiarid regions. This study seeks to understand the spatiotemporal patterns of water salinity and their implication on the downstream water availability in the marginal grabens of northern Ethiopia. We measured the electrical conductivity (EC) of flash floods, baseflows, springs, wells, and lakes. A total of 1,168 samples was collected from 177 spatially distributed water sources (2016–2017). This study shows that there was a significant difference in the EC values of the water points between rainy (1,403 ± 425 μS cm−1) and dry seasons (2,261 ± 258 μS cm−1). Besides, there is an inverse relationship between the river discharges and the runoff EC in the study area. The average value of the water EC was also higher in the limestone area than in the basalt sites. In addition, the water EC increased from the escarpments (396 ± 176 μS cm−1) towards the outlets of the graben basins (1,670 ± 942 μS cm−1). These water EC hotspots in the dry season imply that the river basins are in a closing status due to the erratic rainfall and water extraction by humans. However, the rising water EC and moisture stress endanger the existing agricultural development. Because of the extent and seriousness of salinity, integrated catchment management strategies are needed to tackle the degrading water quality and quantity in the marginal grabens along the northern Ethiopia Rift Valley.

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Integrated assessment of hydrogeology and water quality for groundwater-based irrigation development in the Raya Valley, northern Ethiopia

Cited by 35 publications

References 6 publications

Evaluation of Groundwater Quality and Suitability for Drinking and Irrigation Purposes Using Hydrochemical Approach: The Case of Raya Valley, Northern Ethiopia

Evaluation of Groundwater Quality and Suitability for Drinking and Irrigation Purposes Using Hydrochemical Approach: The Case of Raya Valley, Northern Ethiopia

Global Isotope Hydrogeology―Review

Spatial and temporal patterns of water salinity in the marginal grabens of Ethiopia's Danakil Depression

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