a large concrete pipe for diverting the river under the highway. leaky dirty water from large concrete pipes. dirty sewage from

background canal chemical contamination danger dirty disaster discharge drain drainage dump ecology effluent environment environmental factory flow flowing garbage global green industrial industry liquid natural nature old outdoor pipe pipeline plant polluted pollution problem recycling river sanitary sewage sewer stream substance technology toxic treatment tube unhygienic urban waste wastewater water large concrete for diverting under highway leaky from pipes pollution