Fig. 2
From: Assessing the water quality hazard and challenges to achieving the freshwater goal in Sri Lanka
Geostatistically interpolated maps of mean annual rainfall and mean (1992–2010) surface water-quality parameters across Sri Lanka. a mean annual rainfall; b Electrical Conductivity or EC (salinity); c BOD (Biochemical Oxygen Demand); d Dissolved Oxygen (DO); e; NOxN or Nitrates (NO3) and Nitrites (NO2); and fTotal Phosphorous (TP). Further details about these gridded data can be found in Damania, Desbureaux2. The unit of all parameter values is mg/L except for EC which is µS/cm. The Empirical Bayesian Kriging interpolation method is used for creating these maps from 22 equally spaced grid points in ArcGIS Desktop (v. 10.8).
