http://drw.jfn.ac.lk/handle/123456789/33 2026-05-12T15:32:31Z http://drw.jfn.ac.lk/handle/123456789/406 Characterization and seasonal variation of intake wells for drinking water at Vadamarachchi Aquifer of Jaffna District in Sri Lanka Saravanan, S.; De Silva, C.S.; Thushyanthy, M. Jaffna peninsula is depending on groundwater for their entire water requirement. Seasonal variation of groundwater quality is a matter of serious concern for Jaffna. Groundwater quality becomes crucial during dry periods. There is a tendency for increased concentration of geo chemical parameters in groundwater. The intake wells, which are used for water supply activities are comparably used for extracting more water during the whole year in the identified aquifers. They can easily respond to the seasonal impacts and over extraction than domestic wells.This paper discusses the characteristics and suitability of the water supply in the identified aquifers by analyzing the seasonal water quality and geochemical parameters. Secondary Water quality data of intake wells from 2013 to 2017 and the seasonal and periodical variation of geochemical parameters intake wells and control wells of the aquifer water were analyzed. All intakes are showing periodical degradation due to the seasonal impacts and increased consumption rate. Comparably the control wells are showing less quality variation with the season. Prominently chloride ion is increasing in the intake wells; it may be due to the influence of sea water. The aquifers are adjacent to salty water area, in these sand dune aquifers and there is a high possibility of the salt water intrusion. Geochemical parameters have shown sea water influences other than the geological influences. Therefore, all the aquifers are vulnerable to sea water contamination. Point Pedro scheme needs additional water sources to meet the increasing consumption. 2021-01-01T00:00:00Z http://drw.jfn.ac.lk/handle/123456789/405 Efficiency of micro filtration and oxidation on removal of Iron and manganese in ground water and surface water Jancika, G.; Thushyanthy, M.; Saravanan, S.; Gunalan, K. Water resources are becoming increasingly scarce in many areas of the world due to development, and increased demand. Groundwater is the major water resource in the Jaffna peninsula. One of the problems related to groundwater is the presence of ferrous and manganese which may cause taste, odour, colour, or turbidity problems.The objectives of the study were to focus on removal efficiency of iron and manganese, turbidity, color, and bacteriological parameters through oxidation and micro filtration process using low cost methods suitable at domestic level. water samples were collected with problematic locations in Thenmaradchi for iron and manganese and pond water in Thirunelvely, Pasaiyoor and Kurunagar areas for Coliforms and E.Coli. Preliminary tests were conducted to select suitable aeration time and overnight aeration was identified based on the removal efficiency. The iron, manganese, color, turbidity, pH, electrical conductivity, alkalinity, fluoride, sulphate, total phosphate, chloride, nitrates, total Coliforms and E.Coli were tested for raw and treated water samples. The iron removal efficiency through micro filtration alone was varied from l8% to 100% and the manganese removalefficiency was varied from 65% to -100%. Higher percentage of Mn2 was removed by micro filtration compared to Fe2+ . But the removal efficiency for both Fe2+ and Mn2+ was 95% by oxidation and micro filtration process for surface and groundwater. The color and turbidity both reduced due the removal of iron and manganese. The bacteriological removal efficiency, total coli forms and E.Coli was 100%. There were no differences in other water quality parameters. Micro filtration process also reduces the nitrate nitrogen content of the groundwater. But micro filtration could not be used to remove oil and grease. Micro filtration could be introduced for treatment of groundwater and surface water for color, turbidity, iron and manganese and bacteria removal at domestic level. 2016-01-01T00:00:00Z http://drw.jfn.ac.lk/handle/123456789/399 Groundwater-related issues and the importance of the establishment of a proper groundwater monitoring network for Sri Lanka Samaraweera, K.D.A.; Egodawithana, A.; Kumarasinghe, K.M.S.M.; Mayomi Pumika; Hidayathulla, M.S.M.; Wijesekera, R.S. Demand for groundwater has grown rapidly as a result of population increase and economic development of the country. A wide variety of users such as small-scale irrigators, households and housing development schemes, industries and industrial promotion zones, hotels, shrimp farms are now tapping groundwater in large quantities. The unlimited groundwater extraction cause depletion of the regional groundwater table, drying out surrounding wells located in the shallow aquifers. The groundwater pollution due to application of excess fertilizer, pesticides and other agrochemicals in agricultural areas and emission of wastes from the industriesleads to contaminate groundwater sources considerably. ها Recently, the environmental issues related to groundwater depletion and groundwater pollution is considerably increased in many parts of the country. In areas like Kalpitiya, Jaffna Peninsula, CKD prevailing areas in Anuradhapura, Polonnaruwa, Kurunegala, Monaragala, Badulla and Hambantota districts as well as majority of the community water supply schemes, areas where groundwater based water bottling schemes established and in many other coastal areas these groundwater related issues are reported. Though the environmental issues related to groundwater is cropping up, so far no proper action has been taken to manage the situation. The establishment of agroundwater monitoring network covering the whole country is very much essential at this stage. The paper will discuss the current status of groundwater in Sri Lanka, environmental issues reported and the way of managing this valuable resource of the country. 2015-01-01T00:00:00Z http://drw.jfn.ac.lk/handle/123456789/398 Sustaining a limestone aquifer: Case of Jaffna Peninsula in Sri Lanka Sutharsiny, A.; Manthrithilake, H. The population of the Jaffna Peninsula, in Northern Sri Lanka depends entirely on groundwater resources to meet all their water requirements. The four, main fresh water aquifers in the Jaffna Peninsula are saddled within a Karstic limestone, floating on seawater. This limited resource is endangered in terms of quantity and quality, which has deteriorated over time. A major water quality problem identified in the 1960s is seawater intrusion into the wells in limestone area. Nitrate contamination of groundwater has been receiving attention in the Peninsula since the early 1980s. Over extraction of groundwater, uncontrolled use of fertilizer and other agrochemicals and unsafe sewerage disposal (soakage pits) are the main culprits for this situation. Improved groundwater recharge, regulated use of agrochemicals and the introduction of piped sewerage collection and disposal and appropriate solid waste management systems are a must for the sustainability of Joffina's groundwater system. Training and awareness programs are required to strengthen the public participation. This paper gives an overview of the major issues on groundwater quality and quantity, and justifies the above recommendations 2013-01-01T00:00:00Z