1828 ATLANTIC BEACH DR RES25-0208 Alderman-Impervious Surface Calc. FormulaIjrj,; IMPERVIOUS SURFACE CALCULATION FORMULA
City of Atlantic Beach Building Division
J 800 Seminole Road, Atlantic Beach, FL 32233
Phone: (904) 247-5826 Email: Building-Dept@coab.us
EXISTING IMPERVIOUS SURFACES:
Building footprint:
SQ. FT.
Parking and Drive areas:
SQ. FT.
Patio areas:
SQ. FT.
*Pool areas:
SQ. FT.
Walkways:
SQ. FT.
Mechanical Equip Pads:
SQ. FT.
Other:
SQ. FT.
Total Existing Impervious Surface:
SQ. FT.
Total Existing Lot Area
Existing Impervious
Impervious Surface
Surface %
PROPOSED IMPERVIOUS SURFACES:
Building footprint: 4,236
SQ. FT.
Parking and Drive areas: 604
SQ. FT.
Patio areas:
SQ. FT.
*Pool areas: 253
SQ. FT.
Walkways: 171
SQ. FT.
Mechanical Equip Pads: 67
SQ. FT.
Other: 621
SQ. FT.
Total Proposed Impervious Surface: 5,952
SQ. FT.
5,952 =9,598 =62%
Total Proposed Lot Area Proposed Impervious
Impervious Surface
Surface %
* The surface of the pool is considered 50% permeable.
TO COMPUTE THE MAXIMUM SQUARE FOOTAGE OF IMPERVIOUS SURFACE ALLOWED
ON A LOT, MULTIPLY THE PERCENTAGE ALLOWED IN YOUR ZONING DISTRICT (4S% IN
MOST RESIDENTIAL ZONING DISTRICTS) BY THE TOTAL SQUARE FOOTAGE OF THE LOT.
("EXAMPLE. A lot measuring 7,200 square feet with a 45% coverage would have a maximum
allowable impervious surface coverage of 3,240 square feet)
Section 24-89(c) of the Land Development Regulations requires on-site storage for increased run-off if adding 400
square feet or more impervious surface. Provide Delta volume calculations and on-site retention required per
Section 24-89(c).
Impervious Surface Calculation Formula 07.03.2025