Abstract:
Sri Lanka was hit its worst ever natural disaster and national tragedy on
December 26, 2004, and shallow groundwater wells was completely damage. The
study was conducted in Weligama coastal belt from May 2005 to May 2006 to
identify scale of groundwater pollution due to tsunami. The network of ninety dug
wells distributed over both the affected and non affected tsunami area was selected
and location of the wells was detected with a GPS. Continuous monitoring of the
water levels in the wells was conducted with respect to electrical conductivity (EC),
total dissolved solids, salinity and pH. GIS package MAPINFOR was applied to plot
the hydro-geological map and quality distribution maps. After one year and six
months, EC values are still high and depend on the hydrogeological condition,
elevation, topography and etc. The results of the study revealed that the electrical
conductivity (EC) of groundwater quality situated in the Tsunami-affected region
have EC values, on average, 1500- 3000 μ Siemens/cm.
