What is green space and how do I calculate the square footage of green space on my property?

Per 235-13: GREEN SPACE: Land area with landscaped or natural vegetation, including those vegetated areas located under upper story decks, porches and overhangs that are a minimum of seven feet from the ground at the lowest elevation. 

Minimum green space requirements can be found in 235 Attachment 3, Table III- Table of Dimensional Requirementshere.

 The percentage of green space can be calculated by totaling the square footage of impervious surface, dividing it by the total square footage of the property, multiplying by 100, and then subtracting the final percentage of impervious area from 100. Ex: 1500 sq ft (impervious) / 4,356 sq ft (total sq ft of property) = .344 sq ft .344 sq ft x 100 = 34.4% (percent of property that is impervious). 100% (entire property) - 34.4% (percent of property that is impervious) = 65.6% total green space. 

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1. Does my project proposal need to go before the Conservation Commission?
2. Do I need a local permit to cut trees?
3. What is the difference between pervious and impervious surfaces?
4. What is green space and how do I calculate the square footage of green space on my property?
5. What is the difference between a Conservation Easement, Conservation Open Space, and Current Use?
6. How do I get in contact with the State of New Hampshire Department of Environmental Services?