Working deep underground Nov 21, 2020 Due to the large amount of rainfall in recent days, there have been no reports of flooding in Tehran, because of the efforts of municipal services workers in Tehran. They have continuously dredged nearly 530 km of channel and watercourse. Moreover, the Capillary streams in Tehran are also fully monitored and cleaned every 24 hours. Hamidreza Hasanpour https://www.tehranpicture.ir/u/ivh