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(1) Total Impervious Coverage Calculation

The area of the lot covered by the following shall be included in the calculation of total impervious coverage in all districts:

a. Principal buildings;

b. Accessory buildings, parking garages, carports, and utility and storage sheds;

c. Porches, stairways, elevated walkways, paved areas, or areas otherwise covered with materials impervious to water; and

d. Parking areas and driveways, regardless of surfacing materials unless an alternative pervious paving system is approved by the Director.

(2) Building Coverage Calculation

The area of the lot covered by the following shall be included in the calculation of building impervious coverage in all districts:

a. Principal buildings; and

b. Accessory buildings, parking garages, carports, and utility and storage sheds.

(3) Grading and Drainage

As impervious coverage increases, there may be additional need for drainage provisions, including retention and detention systems. See Section 5.3, Grading and Drainage.