What is the difference between pervious and impervious surfaces?

Pervious means that the surface is permeable and water can pass through, such as crushed stone, patio pavers, deckingand permeable pavement 

 

Impervious means that the surface is impermeable and that water cannot pass through, forcing it to runoff, such as asphalt, concrete, brick, and rooftops. 

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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?