Aquifer monitoring and community engagement in groundwater management for water security in northern Sri Lanka

A paper presented on 16 December 2022 during a Technical Session relating to the sub-theme 'Water Management, Cooperation and Partnership'. Groundwater (GW) in monsoonal rain-dependent Northern Sri Lanka is stressed. Seasonal shortage and saline intrusion are serious issues in seven islands off Jaffna. Aquifer monitoring with well owners involved was done in Karainagar Island. Deteriorating water quality in recent times led to drinking water being transported from the mainland. Thirty-six multi-purpose wells were sampled weekly during wet and monthly during dry seasons. Results from the water year November 2020 to October 2021 are presented. Water levels (WL), Electrical Conductivity (EC), and pH were measured. Water from most wells was then unsuitable for consumption. pH value of all wells was within the recommended range (6.5-8.5). Few wells were significant outliers. Several owners were competent in aquifer monitoring, aware of the vulnerability of water supply, the importance of rainwater infiltration and the need to stop deepening wells, a rising trend in the mainland. New knowledge of local water dynamics, citizen engagement, and involvement of government agencies would enhance the community's quality of life, lowering the possibility of further out-migration of people