Groundwater quality changes in the tsunami affected coastal belt - Southern Sri Lanka

The groundwater quality of an aquifer system in Mirissa area was studied. 19 dug wells distributed over a 6 km coastal strip were selected. The dug wells were sited in a line perpendicular to the coastline. Most of the dug wells were shallow and their diameter ranged from 0 to 1m. In low lying coastal areas, electrical conductivity was 3500 μs/cm. Heavy rains in early January improved the quality in coastal groundwater and hydro geological discharge was also significantly affected. First and second lines receiving their recharge from inland. Therefore, pH values changed and the quality of water significantly improved giving an electrical conductivity below 1000 μs/cm

Natural water purification system for local community

A simple household level natural water purification system to purify water to meat small family requirement. It disused with six important components including Storage, Sedimentation, Biological treatment, and Filtering, Disinfection and Drinking water storage. During the treatment process Electrical conductivity and Total Dissolved Solids values is not changed but pH is slightly increased in the bio treatment compartment due to excretion of ammonia form by the fish. A Significant change of Coli form bacterial count between UV treatment together with sand and Charcoal filter with comparing drinking water tank It is 90.95% reduction comparing with raw water E coli count is completely removed from this treatment process