NEWDELHI, April 20 -- Government agencies have started removing concrete and soil debris below the newly built Signature Bridge, that had almost blocked the Yamuna.HT had on April 17 reported how the construction and demolition debris had almost choked the river below the bridge, leaving a gap of only few metres for the river to pass flow as a trickle. Experts had even pointed out this was in violation of the clearance given to the Delhi Tourism and Transportation Development Corporation (DTTDC), as the conditions specifically mentioned that no debris could be dumped into the river and the flow can't be obstructed at any point of time....