Ключевые слова: canal, catchment, concrete, conduit, contaminate, contamination, culvert, dirty, drain, drainage, drainpipe, duct, dump, ecology, environment, environmental, flood, floodwater, flow, industrial, industry, large, opening, outfall, outflow, outlet, overflow, pipe, piping, pollution, pouring, rain, rainwater, runoff, sanitary, sewage, sewer, sewerage, spout, storm, stormwater, stream, system, tube, tunnel, two, waste, wastewater, water,