Con­tam­i­na­tion over­drive

Down to Earth - - SCIENCE -

of ground­wa­ter in megac­i­ties is re­spon­si­ble for the con­tam­i­na­tion of deep water sources. A study in Dhaka shows that ex­trac­tion of ground­wa­ter is low­er­ing the water ta­ble in and around the city by 3 me­tres a year, driv­ing down shal­low water con­tam­i­nated with ar­senic. Peo­ple in and around the city use deep wells as shal­low ground­wa­ter is con­tam­i­nated. Pre­vi­ous stud­ies had said that it takes ar­senic 100 years to reach water sources at the depth of 150 m. But the Dhaka study shows that deep water sources in and around the cap­i­tal could be pol­luted within a decade. Na­ture Com­mu­ni­ca­tions, Septem­ber 27

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