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An Assessment of Groundwater Quality in Kottukal Microwatershed in Thiruvananthapuram District, South Kerala


Affiliations
1 State Groundwater Department, Thiruvananthapuram 695 004, India
2 School of Environmental Sciences, Kannur University, Kannur 670 002, India
3 Groundwater Department, Alappuzha 688 002, India
 

The Kottukal microwatershed is an uplifted sedimentary watershed of recent origin formed due to large scale neo-tectonic activity. The groundwater from this watershed is largely abstracted for both irrigation and local public drinking water supply schemes. The present communication is an attempt to assess the detailed groundwater quality of the unconfined aquifers and the stream water system within the microwatershed. The Hill–Piper diagram indicates majority of groundwater samples are found to be Na–Cl followed by a mixed and Ca–HCO3 type. The Na–Cl characterization of groundwater in this elevated terrain is not due to primary salinity, but could be attributed to combined effects of irrigation salinity and improper sanitation facilities. The values of total dissolved solids and electrical conductivity in groundwater samples are low as compared to stream water samples, suggesting distinct imprints of hydro-geochemical behaviour. The Wilcox diagram indicates, 90% of water samples falls in the C1–S1 sector depicts its suitability for irrigation. The total coliform and faecal coliform count of >1600 MPN is noted in 88% of water samples. The alkaline trend and high bacteriological contamination points to the prevalence of a non-sterile environment resulted from agronomic practices and poor environmental sanitation facilities within the watershed.

Keywords

Groundwater Recharge, Groundwater Quality, Kottukal Stream, Micro-Watershed.
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  • Jacob, N., Suresh Babu, D. S. and Shivanna, K., Radon as an indicator of submarine groundwater discharge in coastal regions. Curr. Sci., 2009, 97(9), 1313–1320.

  • Suresh Babu, D. S., Anish, M., Vivekananthan, K. L., Ramanujam, N., Murugan, K. N. and Ravindran, A. A., An account of submarine groundwater discharge of SW Indian Coastal Zone. J. Coast. Res., 2009, 25, 1–104.

  • Standard Analytical Procedures for Water Analysis, Laboratory Manual, Hydrology Project, CSMRS Building, 4th Floor, Olof Palme Marg, New Delhi, 1998.

  • Indian Standard Specification for Drinking Water, IS 10500, 2012.

  • Rajendran, S., Thompson, L. and Ajeeb, A., Implications of Rainwater Harvesting in the Coastal Aquifer – A Case Study. In Proceedings of the International Conference on Water Resources Management in Arid Region, Kuwait, 23–27 March 2002, pp. 135–142.

  • Hill, Geochemical Patterns in Coachelle, Valley, California, Trans. Amer. Geophysical Union, 1940, vol. 21.

  • Piper, A Graphic Procedure in the Geochemistry Interpretation of Water Analysis, Trans. Amer. Geophysical Union, 1944, vol. 25.

  • Panno, S. V., Hackley, K. C., Hwang, H. H., Greenberg, S. E., Krapac, I. G., Landsberger, S. and O’Kelly, D. J., Characterization and identification of Na–Cl sources in groundwater. Groundwater Pub., 2006, 44(2), 176–187.

  • Giridharan, T., Venugopal, T. and Jayaprakash, Evaluation of the Seasonal Variation on the Geochemical Parameters and Quality Assessment of Groundwater in the Proximity of River Cooum, Chennai, India Environ. Monit. Assess., Pub. No. 143, 2008, pp. 161–178.

  • Rai, M. M., Principles of Soil Science, Macmillan India, Madras, 1977, p. 122.

  • Wilcox, L. V., Classification and Use of Irrigation Water, US Department of Agriculture, Cir. 969, 1955.


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  • An Assessment of Groundwater Quality in Kottukal Microwatershed in Thiruvananthapuram District, South Kerala

Abstract Views: 234  |  PDF Views: 73

Authors

Lal Thompson
State Groundwater Department, Thiruvananthapuram 695 004, India
Shalu George
School of Environmental Sciences, Kannur University, Kannur 670 002, India
A. Bushra
State Groundwater Department, Thiruvananthapuram 695 004, India
S. R. Santy
Groundwater Department, Alappuzha 688 002, India

Abstract


The Kottukal microwatershed is an uplifted sedimentary watershed of recent origin formed due to large scale neo-tectonic activity. The groundwater from this watershed is largely abstracted for both irrigation and local public drinking water supply schemes. The present communication is an attempt to assess the detailed groundwater quality of the unconfined aquifers and the stream water system within the microwatershed. The Hill–Piper diagram indicates majority of groundwater samples are found to be Na–Cl followed by a mixed and Ca–HCO3 type. The Na–Cl characterization of groundwater in this elevated terrain is not due to primary salinity, but could be attributed to combined effects of irrigation salinity and improper sanitation facilities. The values of total dissolved solids and electrical conductivity in groundwater samples are low as compared to stream water samples, suggesting distinct imprints of hydro-geochemical behaviour. The Wilcox diagram indicates, 90% of water samples falls in the C1–S1 sector depicts its suitability for irrigation. The total coliform and faecal coliform count of >1600 MPN is noted in 88% of water samples. The alkaline trend and high bacteriological contamination points to the prevalence of a non-sterile environment resulted from agronomic practices and poor environmental sanitation facilities within the watershed.

Keywords


Groundwater Recharge, Groundwater Quality, Kottukal Stream, Micro-Watershed.

References





DOI: https://doi.org/10.18520/cs%2Fv114%2Fi03%2F655-660