Your search found 6 records
1 Nanthini, T.; Mikunthan, T.; Vijayaratnam, R. 2001. Some physico-chemical characters of groundwater in some (selected) water supply wells in the Jaffna Peninsula. Journal of National Science Foundation Sri Lanka, 29(1-2):81-95.
(Location: IWMI-HQ Call no: P 6561 Record No: H033024)
2 Mikunthan, T.. 2005. Status of groundwater quality in Jaffna Peninsula: Special reference to nitrate and chloride. In Galagedara, L. W. (Ed.). Water resources research in Sri Lanka: Symposium Proceedings of the Water Professional’s Day 2005. Peradeniya, Sri Lanka: PGIA. pp.153-162.
Water quality ; Groundwater ; Nitrates ; Chlorides ; Water pollution ; Assessment ; Wells ; Drinking water ; Water supply / Sri Lanka / Jaffna Peninsula / Chunnakam / Velanai / Vaddukoddai / Araly South / Karaveddy / Kondavil
(Location: IWMI HQ Call no: IWMI 631.7 G744 GAL Record No: H040713)
3 Arasalingam, Sutharsiny; Pathmarajah, S.; Mikunthan, T.; Vithanage, M.; Manthrithilake, Herath. 2013. Impact of agricultural activities on groundwater quality and its suitability for drinking in Valikamam area, Jaffna Peninsula. In Sri Lanka Water Partnership (Lanka Jalani); International Water Management Institute (IWMI); Unilever-Pureit. Proceedings of the First Young Water Professionals Symposium, Colombo, Sri Lanka, 22-23 November 2012. Colombo, Sri Lanka: Sri Lanka Water Partnership (Lanka Jalani); Colombo, Sri Lanka: International Water Management Institute (IWMI); Colombo, Sri Lanka: Unilever-Pureit. pp.74-81.
Groundwater resources ; Drinking water ; Water quality ; Agricultural production ; Wells ; Aquifers ; Fluorides ; Nitrates ; Chlorides ; Calcium ; Magnesium ; Carbonates ; Bicarbonates ; Sodium ; Potassium / Sri Lanka / Jaffna Peninsula / Valikamam / Chunnakam aquifer
(Location: IWMI HQ Call no: 333.91 G744 SRI Record No: H046158)
http://lankajalani.org/wp-content/uploads/2015/03/Proceedings-YWPS.pdf
https://vlibrary.iwmi.org/pdf/H046158.pdf
https://vlibrary.iwmi.org/pdf/H046158.pdf
(0.64 MB) (5.26 MB)
4 Arasalingam, Sutharsiny; Manthrithilake, Herath; Pathmarajah, S.; Mikunthan, T.; Vithanage, M. 2013. Seasonal variation of Nitrate-N in groundwater: a case study from Chunnakam aquifer, Jaffna Peninsula [Abstract only] In Ileperuma, O.; Priyantha, N.; Chandrajith, R.; Navaratne, A.; Perera, A.; Yatigammana, S.; Wijesundara, S.; Rathnayake, S. (Eds). 2013. Proceedings of the Second International Symposium on Water Quality and Human Health: Challenges Ahead, Peradeniya, Sri Lanka, 15-16 March 2013. Peradeniya, Sri Lanka: University of Peradeniya. Postgraduate Institute of Science. pp.7.
Groundwater pollution ; Water quality ; Nitrates ; Contamination ; Drinking water ; Aquifers ; Wells / Sri Lanka / Jaffna Peninsula / Chunnakam aquifer
(Location: IWMI HQ Call no: e-copy only Record No: H046230)
(0.09 MB)
The Jaffna Peninsula has four main aquifer systems, of which the largest Chunnakam aquifer is in the Valikamam area. This is an intensively cultivated area in the Jaffna Peninsula, and consequently, excessive application of nitrogen fertilizer is found. Other sources of nitrate include organic manures, and urine and excreta of animals through human activities. The aim of this study was to assess the N-nitrate contamination in drinking water of the Chunnakam aquifer, which was a sub-objective of a research project carried out by the International Water Management Institute (IWMI). Forty four (44) groundwater samples were collected from wells representing different uses and land use patterns. The sampling covered the period from January to December, 2011, representing all seasons. Nitrate-N in sampled water was determined colorimetrically using a spectrophotometer. The spatial variations of the water quality were mapped using ArcGIS 10. Nitrate-N values from domestic, domestic with home garden and public wells ranged from below 0.1 to 12.1 mg L'I. During the rainy season, 38% of the agro-wells exceeded the limit of WHO drinking water guidelines (10 mg L· I) and these were not suitable for drinking purposes. However, this percentage was 15% at the end of the dry season. A decreasing trend in nitrate-N concentration was observed from January to March. During the rainy season, the soil was wet enough up to the water table facilitating nitrate leaching. Nitrate-N found in most of the wells surrounded by areas with highland crops (onions, chillies, tobacco and brinjals) also exceeded the acceptable level (10 rug L'l). Even though these wells are used for agricultural purposes, people who work in the field use agro-wel1s for drinking. This water pollution is very likely related to the heavy use of N-based fertilizers for cultivation in the region. This leads to groundwater unsafe for drinking. Therefore, effective management of groundwater quality in the region is vital and further, creating awareness among population would possibly reduce the excessive use of chemical fertilizers in agriculture.
5 Mikunthan, T.; Vithanage, M.; Pathmarajah, S.; Arasalingam, Sutharsiny; Ariyaratne, Ranjith; Manthrithilake, Herath. 2013. Hydrogeochemical characterization of Jaffna’s aquifer systems in Sri Lanka. Colombo, Sri Lanka: International Water Management Institute (IWMI). 69p. [doi: https://doi.org/10.5337/2014.001]
Hydrology ; Geochemistry ; Aquifers ; Groundwater recharge ; Water quality ; Water levels ; Nitrogen fertilizers ; Contamination ; Drinking water ; Evapotranspiration ; Wells ; Soils ; Land use ; Rainfall patterns / Sri Lanka / Jaffna Peninsula / Chunnakam
(Location: IWMI HQ Call no: IWMI Record No: H046389)
(7 MB)
6 Arasalingam, Sutharsiny; Manthrithilake, Herath; Pathmarajah, S.; Mikunthan, T.; Vithanage, M. 2020. Geo-statistical approach for prediction of groundwater quality in Chunnakam Aquifer, Jaffna Peninsula. Journal of Jaffna Science Association, 2(1):12-24.
Groundwater ; Water quality ; Aquifers ; Spatial distribution ; Forecasting ; Water properties ; Wells ; Geostatistics ; Models / Sri Lanka / Jaffna Peninsula / Valikamam / Chunnakam Aquifer
(Location: IWMI HQ Call no: e-copy only Record No: H050216)
http://journal.thejsa.org/index.php/jsaj/article/view/13/9
https://vlibrary.iwmi.org/pdf/H050216.pdf
https://vlibrary.iwmi.org/pdf/H050216.pdf
(3.03 MB) (3.03 MB)
Chunnakam aquifer is the main limestone aquifer of Jaffna Peninsula. The population of the Jaffna Peninsula depends entirely on groundwater resources to meet all of their water requirements. Thus for protecting groundwater quality in Chunnakam aquifer, data on spatial and temporal distribution are important. Geostatistics methods are one of the most advanced techniques for interpolation of groundwater quality. In this study, Ordinary Kriging and IDW methods were used for predicting spatial distribution of some groundwater characteristics such as: Electrical Conductivity (EC), pH, nitrate as nitrogen, chloride, calcium, carbonate, bicarbonate, sulfate and sodium concentration. Forty four wells were selected to represent the entire Chunnakam aquifer during January, March, April, July and October 2011 to represent wet and dry season within a year. After normalization of data, variogram was computed. Suitable model for fitness on experimental variogram was selected based on less Root Mean Square Error (RMSE) value. Then the best method for interpolation was selected, using cross validation and RMSE. Results showed that for all groundwater quality, Ordinary Kriging performed better than IDW method to simulate groundwater quality. Finally, using Ordinary Kriging method, maps of groundwater quality were prepared for studied groundwater quality in Chunnakam aquifer. The result of Ordinary Kriging interpolation showed that higher EC, chloride, sulphate and sodium concentrations are clearly shown to be more common closer to the coast, and decreasing inland due to intrusion of seawater into the Chunnakam aquifer. Also higher NO3 - - N are observed in intensified agricultural areas of Chunnakam aquifer in Jaffna Peninsula.
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