The first elections in Jaffna since the war ended was held yesterday with many political promises. However, experts point out a water shortage silently looming in Jaffna, that will affect the people beyond these political promises. The fact that Jaffna will face a severe water shortage in the future, if water extraction is not managed, has been revealed by a study done by Jaffna University’s Department of Agricultural Engineering. No river flows across the Jaffna peninsula.
Hence, the groundwater in the limestone aquifer is the main source of water for the area. Aquifers are underground layers of rock that are saturated with water that can be brought to the surface through natural springs or by pumping. The extracted water must be replaced by new water to replenish or recharge the aquifer. But in Jaffna, this recharge rate is 0.57 million cubic metres (MCM) of water, while the extraction rate is 0.66 MCM, according to research done by M. Thushyanthy and C.S. De Silva. So, Jaffna’s limestone aquifer will become depleted over the years, these water experts fear.
Rapid development of agriculture, economy and increase of population due to resettlement, creates greater withdrawal of water. Especially, water extraction for agricultural purposes will impact Jaffna’s water resources, according to this study.
However, this situation is not only restricted to Jaffna. Sri Lanka’s aquifers located in other areas will also face similar issues, says Water Resources Board (WRB) Director General R.S. Wijesekare.
He fears the changing rainfall patterns due to Climate Change will impact Sri Lanka’s groundwater aquifers. Not only the drought, but intense rain during a short period of time, will also disturb groundwater recharging cycles, as it will not allow rain water to leach down, but runoff quickly into rivers. The presence of buildings prevents rainwater from leaching, hence leaching in urban areas is severely reduced, which slows down groundwater recharge, while groundwater extraction for commercial purposes is increasing. Hence, a solution needs to be found for the future, point out water experts.
At least for the Jaffna aquifer, the Jaffna University researchers recommend the establishment of an institution for a groundwater regulatory framework, to optimise its usage by controlling its overuse.
Published on SundayTimes on 22.09.2013 http://www.sundaytimes.lk/130922/news/severe-water-shortage-looms-in-jaffna-63294.html
Tags: Ground water