[OPINION] Eco-Heart Index: The science of loving our rivers

The Eco-Heart Index, as one would imagine, uses the shape of the heart to indicate the quality of the water, in which each shape indicates a different situation for that particular river. A full-plotted heart shape shows that the water is clean whereas broken-hearted shapes such as ‘thin heart’, ‘rabbit ear’, ‘finger’ and ‘diamond’ show the different degrees of water pollution - more 'broken hearts' indicate that these sites are developed and populated by humans.