HYDROGEOLOGICAL STUDIES OF MARUDAIYARU -ARIYALUR WATERSHED, ARIYALUR DISTRICT, TAMILNADU.
Publication Date : 04/04/2016
The study area Marudaiyar – Ariyalur mini watershed of Ariyalur district which represents a part of coastal sedimentary plains and river basin is mainly composed of Cretaceous, Tertiary and Quaternary formation which includes calcareous sandstones, shell limestones and alluvium. The hydrogeochemical studies reveals that the pH values of all the samples of the study area are between 7-8 and within the range of utilization, EC and TDS also reveals that two third of the samples fall in Fresh water category both in pre and post monsoon seasons. However, one third falls in brackish water category. Based on the USSL classification, most of the samples of the study area during premonsoon and post monsoon seasons fall in C3S1 category and three samples falls in C2S1 category indicating high salinity and low sodium water type, which can be used for irrigation on almost all types of soil. Piper Trilinear diagram reveals that in the cation plot, most of the water samples falls in Calcium-Sodium facies type and only few samples fall in Calcium-Magnesium facies type, whereas in the anion plot it falls only in Chloride-Sulphate-Bicarbonate facies type. Regarding the condition of the drinking water nearly two third of the samples are within the limits. One third of the samples, which falls in the North Eastern and Eastern side of the study area, were having values above the limits. Keywords: Cretaceous, Shell limestone, Tertiary formations, dendritic, calcareous, fossiliferous, aquifers.
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