More diversion channels planned for southern suburbs Updated: Updated: Residents, though, have doubts about their efficiency and maintenance Share Article AAA Sensitive zone: Environmental activists say any plan involving the Pallikaranai marshland should be executed only in consultation with the Forest Department. | Photo Credit: The Hindu Residents, though, have doubts about their efficiency and maintenance With its experience in draining floodwaters into waterways, the Water Resources Department (WRD) has proposed more diversion channels and cut-and-cover channels in the southern suburbs that witnessed inundation this northeast monsoon. However, a few residents have raised doubts about the efficiency and maintenance of these channels.