flooding

water

drain

pollution

pipe

sewage

drainage

canal

sewer

waste

river

flowing

tube

dirty

environment

flow

stream

industry

storm

industrial

nature

stormwater

treatment

environmental

concrete

construction

flood

wastewater

equipment

ecology

toxic

garbage

pipeline

overflow

culvert

danger

infrastructure

urban

rain

ditch

factory

pipes

natural

pond

contamination

daily

life