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The RESIN project  gives the following definition:
Familiar urban infrastructure such as roads, sewer systems and storm drains is known as 'grey infrastructure'. Such conventional infrastructure often uses engineered solutions typically designed for a single function. 
- ↑ http://www.resin-cities.eu/
- ↑ Parliamentary Office of Science and Technology (POST), Houses of Parliament (UK). 2013. Urban Green Infrastructure. POSTnote, no. 448.