Irrigation groundwater quality appraisal of Mahendragarh block of Mahendragarh district, Haryana.

摘要

Pressures on groundwater resources in semi-arid regions due to irrigation can be released through the judicious use of this scarce resource by knowing the groundwater quality of that area. Thus, the groundwater quality survey was performed in Mahendragarh block of Mahendragarh district, Haryana. The study focuses on spatial variability of electrical conductivity (EC), pH, cationic and anionic composition of the groundwater. The study revealed that 85.06% of the samples showed EC values less than 4 dS/m and the maximum value of EC was found as 9.65 dS/m in village Khudana. Residual sodium carbonate (RSC) and sodium adsorption ratio (SAR) varied from nil to 14.72 me/l and 0.54 to 17.32 (m mol/l)1/2, respectively. According to AICRP classification, the maximum samples were found in good quality (25.3%) category followed by marginally alkali (19.5%). The per cent samples in saline classes i. e. marginally saline, saline and high SAR saline were 12.6, 10.4 and 12.6, respectively. The concentration of Na+, Ca+2 and Mg+2 ions generally increased with increase in EC of the water samples. Cl- and HCO₃-, were found in appreciable quantities, whereas CO₃-2 were in traces. Contour maps of EC, SAR and RSC of groundwater used for irrigation in Mahendragarh block were plotted to study spatial variability of these parameters. Contour map of EC reveals that quality of water is better in southern and western parts of the block in comparison to eastern, northern and central parts.