What is the meaning of impervious area?

Impervious Area is any type of surface that does not allow for the passage of stormwater into the ground. Examples include paving, concrete and rooftops.

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1. What is the meaning of impervious area?
2. If I feel the estimate of my impervious area is incorrect, what can I do?
3. Will fee credits be applied automatically for new development that meets current Maryland Department of the Environment stormwater design standards?
4. If I am approved for a fee credit will it be retroactively applied to when the private stormwater facility was built?