Watch: Dramatic footage shows exactly what happens when a city is flooded

These are the extraordinary scenes that show just how a city was affected when a river burst its banks and flooded the streets.

The river Huaycoloro recently overflowed throughout the district of San Juan de Lurigancho in the Peruvian capital Lima.

One clip shows an almost dry river bed that is suddenly filled with gushing brown water as the flood begins.

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A raft of debris is seen carried on its leading edge and the river is quickly filled, brushing the underside of a bridge that seconds before had been several feet clear.

Another clip, filmed from high up in a tower block, shows the street below engulfed by the rushing brown waters.

Sirens can be heard as police officers try to usher citizens to safety, while motorcycle officers ride at low speed in front of the advancing flood with sirens and lights on to warn people of the danger.

Some areas were gridlocked with traffic and the clean water supply was cut off, while the flood caused damage including a broken bridge.

There were reports that some residents risked their lives by jumping over the broken portion of the bridge but there have been no casualties reported.