A two-day workshop on image processing and GIS techniques in Geology commenced at the National College here on Friday. The workshop is organised by the college’s Department of Geology . S.Natarajan, Collector, Tiruvarur district, in his inaugural address spoke on the importance of recharging groundwater. He highlighted the remedial measures implemented in Tiruvarur district for augmenting groundwater . While emphasising the need to popularise Geology among students, Mr.Natarajan shared some of the field experiences gained in the process of constructing subsurface dykes in Tiruvarur district . K.Anbarasu, principal, and S.Selvaraj, coordinator of the workshop, spoke.