Figure 3. Maps showing the spatial distribution of three indices scores obtained by heavy metal pollution evaluation indices of the water samples: (a) HPI, (b) Cd , (c) HEI

From

Evaluation of Heavy Metal Pollution Indices in Irrigation and Drinking Water Systems of Barapukuria Coal Mine Area, Bangladesh

Pradip Kumar Biswas, Nasir Uddin, Sha Alam, Tamjid -Us-Sakib, Sharmin Sultana, Tofayal Ahmed

American Journal of Water Resources. 2017, 5(5), 146-151 doi:10.12691/ajwr-5-5-2