Abstract
Hydrogeochemical characteristics of Groundwater analyzed in the study area of Coimbatore district by collecting 60 samples from agricultural belt. Groundwater quality for irrigation is determined by several key factors like pH, Electrical conductivity (EC), Total suspended solids (TDS). The cations such as Sodium (Na+), Potassium (K+), Calcium (Ca2+), Magnesium (Mg2+ ) and anions are Hydrocarbon (HCO3), Carbonate (CO3 -), Chlorides (Cl-)and Sulphates (SO4 2-) are tested. The irrigation water quality parameters such as Residual Sodium Carbonate (RSC), Sodium Absorption Ratio (SAR), Chloro Alkali Indices (CA I & CAII), Kelley’s Ratio (KR), Magnesium Hazard (MH), Percent sodium (%Na) and Permeability Index (PI), Soluble sodium Percent (SSP) are computed from the key factors, anions and cations. From the USSL Diagram the samples fall in C2S1, C3S1, C4S1 range. Salinity hazard is too elevated in the study area, all the samples are categorized under high to very high with the values greater than 750 μS/cm. Total dissolved solid in the study area indicated that only 2 locations are unfit for irrigation. SAR and % Na shows that there is no hazard related to irrigation watering. Magnesium hazard in the groundwater is high and indicates 51 sample out of 60 is unsuitable for irrigation. From the study it indicates the groundwater is contaminated with salt content and in most of the area it can be used for irrigation.
 Keywords: Groundwater, Irrigation water quality, Salinity hazard, Kelley’s ratio, Magnesium hazard
Highlights
Management of groundwater is vital for the sustainable growth of nation
Irrigation water quality parameters: In the study area of Coimbatore district 60 samples were collected from agricultural belt
Magnesium Hazard (MH) value should be less than 50meq/l, Out of 60 samples 9 samples were apt for agriculture as per magnesium hazard revealed in the table 4.10
Summary
Study area: Coimbatore is agriculture based district with the area of 4723 sq km. It is situated at the altitude of 411 meters above mean sea level. It is one of the largest city in Tamil Nadu state Coimbatore District is composed of rocks of Dharwar age, which is of high grade metamorphic rocks. Depth of the sample extraction in the study area was in the range of 30 ft to 250 ft. In total 60 groundwater samples have been drawn from borewells and open wells. The samples were gathered in plastic containers, sanitized with distilled before gathering groundwater
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