water channel

background bacterium canal canalization channel chemical concrete conduit corrosion dam day dirtiness dirty discharge ditch drain drainage dry duct dump ecology environment environmental factory fall filthy floating flow flowing fluid forest garbage generation grass ilthiness industrial industry isolated liquid material narrow natural nature pipe pipeline plant plastic plastics plastomer pollutant pollution poluted pouring refreshing resource resources river sanitary sewer slop stream substance summer sunday system toxic treatment tree trees tube unclean waste wastewater water white wood wooden