Known as the silicon roundabout, Old Street is a high profile, pedestrian orientated scheme that converts an existing roundabout island into an urban peninsula with a new entrance for the London Underground station. The design incorporates natural and manufactured climate resilience measures. This includes a flood defence system and the use of materials that enable permeability and provide attenuation, natural interventions like rain gardens and green roof systems also double as a source control mechanism for run-off. This includes photocatalytic paving which uses natural daylight to convert harmful NO2 gases into harmless nitrates that are washed into the rain gardens. 

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