For urban buildings with small sites, green roofs and rainwater collection and reuse systems are the most likely strategies to bring the project to compliance with this credit. While it is important to have a professional calculate the required amount of

For urban buildings with small sites, green roofs and rainwater collection and reuse systems are the most likely strategies to bring the project to compliance with this credit. While it is important to have a professional calculate the required amount of vegetated area needed to mitigate 15% of onsite rainfall, a reasonable rule of thumb is that you’ll need to cover at least 20% of the site area with a green roof or other vegetation.