Rushing Flood Water in Sewer Drainage Overflow Tunnel through Metal Grate

sewer sewage waste water wastewater sewage system sewer system sewage treatment wastewater treatment sewage treatment plant storm drain 4k drainage stormwater management drainage systems rungs environment dirty climate water treatment drainage infrastructure sewer systems flood control flood mitigation flood protection civil engineering sanitation heavy rain city flood filter background surging water heavy water flow recycle sewerage climate change conservation clean concrete dam electricity overflow tunnel pollution underground manhole cesspool industrial flowing