Bridges and elevated expressways are filling up with fleets of parked cars, to spare them from the deluge below.
But in the industrial era after the Korean War, the stream, by then a rank open sewer, was entombed by pavement and forgotten beneath a lacework of elevated expressways as the city's population swelled toward 10 million.
Modern building up of the city and the auto industry boom have brought a water short age and traffic congestion; it is hoped by 1970 elevated expressways will solve the traffic problem.
Of course, the film is also a reminder of how quickly an idea of the future can date: its visions of life in 2026, with aircraft flying through canyon-like city streets and cars whizzing on elevated expressways that run right through office blocks, already look gloriously archaic.
The elevated expressways were built to take walkers from the busy railways stations, which are crowded with pedestrians, hawkers, rickshaws and public buses, and connect them to targeted destinations like residential areas, bus stations, taxi stands, office spaces and shopping areas.
They whiz and weave across elevated expressways.
