This is a good paper and the problem is well defined. It was interesting to see the results of mapping water pollution information in GIS in a practical problem in the developing countries. Please make sure to visually illustrate sources of pollutions in Figure 2 (other figures too) in black and white may be using different arrow styles or shaded color. Remember that the conference book will be published in black & white. Finally the flow chart in Figure 4 is hard to read, can you make the font clearer