Ключевые слова: building, catchment, circular, concrete, concrete culvert, confined space, construction, culvert, dark, discharge line, ditch, drain, drain line, drain pipe, drainage, flow, gravity, highway, hydraulics, hydrology, inlet, inside, inside view, outfall, outlet, overflow, pipe, pipe under road, pipeline, precast, relief line, road, road building, road construction, service, spooky, storm water, stormwater, stormwater drain, subsurface, tube, tunnel, water,