Item 7CAGENDA ITEM #7C
MARCH 27, 2006
CITY OF ATLANTIC BEACH
CITY COMMISSION STAFF REPORT
AGENDA ITEM: Proposed revisions to the definition of Impervious Surface within
Section 24-17 of Chapter 24, the Land Development Regulations, related to the
designation of swimming pools as pervious area.
SUBMITTED BY: Rick Carper, P.E. c~
Public Works Director
DATE: March 20, 2006
BACKGROUND: At the March 13th meeting, the City Commission directed Staff to draft
a proposed ordinance change to revise the definition of impervious surface to
designate the water surface area of a swimming pool as 40% impervious because of
the pools inherent capability to retain up to 6 inches of rainfall before allowing
stormwater runoff.
The Community Development Board previously considered this revision at their
January 17th meeting. After considerable discussion by the CD Board and
comments from the public, the CD Board recommended that the definition remain
unchanged with respect to the treatment of swimming pools as pervious area, but
recommended that other changes related to the use of pavers, pervious concrete or
open grid paving systems be adopted by the City Commission. A major factor in the
CD Board decision was the ability of swimming pools to absorb about 6 inches of
rainfall (compared to the COAB design 25 year / 24 hour storm rainfall of 9.3 inches)
before there is any runoff from the pool surface area.
BUDGET: No budget issues.
RECOMMENDATION: Approve on First Reading Ordinance 90-06-190 related to
modifying Land Development Regulations Section 24-17 to define swimming pools
as 60% pervious.
ATTACHMENTS: 1) Draft Ordinance Number 90-06-190
REVIEWED BY CITY MANAGER:
March 27, 2006 regular meeting
AGENDA ITEM #7C
MARCH 27, 2006
ORDINANCE NUMBER 90-06-190
AN ORDINANCE OF THE CITY OF ATLANTIC BEACH, FLORIDA,
AMENDING CHAPTER 24 OF THE ATLANTIC BEACH CODE OF
ORDINANCES, THE LAND DEVELOPMENT REGULATIONS, SECTION
24-17, DEFINITIONS, PROVIDING THAT SWIMMING POOLS BE
CONSIDERED AS FORTY PERCENT (40%) IMPERVIOUS, AND
PROVIDING AN EFFECTIVE DATE.
NOW THEREFORE, BE IT ENACTED BY THE CITY COMMISSION ON BEHALF
OF THE PEOPLE OF THE CITY OF ATLANTIC BEACH, FLORIDA:
SECTION 1. The Zoning, Subdivision and Land Development Regulations, adopted as
Chapter 24 of the Code of Ordinances of the City of Atlantic Beach, Florida, is hereby amended by
modifying Article II, Section 24-17, Definitions, Impervious Surface, and upon enactment of this
Ordinance, said definition shall read as set forth below.
Impervious Surface shall mean those surfaces that prevent the entry of water into the soil.
Common Impervious Surfaces include, but are not limited to, rooftops, sidewalks, patio areas,
driveways, parking lots, and other surfaces made of concrete, asphalt, brick, plastic, or any surfacing
material with a base or lining of an impervious material. Wood decking elevated two or more inches
above the ground shall not be considered impervious provided that the ground surface beneath the
decking is not impervious. Pervious areas beneath roof or balcony overhangs that are subject to
inundation by stormwater and which allow the percolation of that stormwater shall not be considered
impervious areas. The pool water surface area of swimming pools shall Abe considered as forty
percent (40%) Impervious Surfaces (or sixthpercent (60%) pervious) because of their ability to
retain ed~l-a certain amount of rainwater, however, decking around a pool may be considered
impervious depending upon materials used. Surfaces using pervious concrete or other similar open
grid paving systems shall be calculated as fifty percent (50%) Impervious Surface provided that no
barrier to natural percolation of water should be installed beneath such material. Open grid Pavers
must be installed on a sand base, without liner, in order to be considered 50% impervious. Solid
surface pavers (e.g. brick or brick appearing pavers as opposed to open grid pavers) do not qualify
for any reduction in impervious area, regardless of type of base material used.
Unless otherwise and specifically provided for in these Land Development Regulations, or within
another Ordinance, or by other official action establishing specific Impervious Surface Limits for a
particular Lot or Development Project, the fifty percent (50%) Impervious Surface limit shall be the
maximum Impervious Surface limit for all new residential Development and redevelopment. In such
cases where a previously and lawfully developed residential Lot or Development Project exceeds the
fifty percent (50%) limit, redevelopment or additions to existing residential Development shall not
exceed the pre-construction Impervious Surface limit, provided the stormwater and drainage
requirements of Section 24-66 are met.
SECTION 2. This Ordinance shall take effect immediately upon its final passage and
adoption and shall be recorded in a book kept and maintained by the Clerk of the City of Atlantic
Beach, Duval County, Florida, in accordance with Section 125.68, Florida Statutes.
March 27, 2006 regular meeting
AGENDA ITEM #7C
MARCH 27, 2006
Passed upon first reading by the City Commission of the pity of Atlantic Beach this
2006. Passed upon final reading and public hearing this th day of
2006.
DONALD M. WOLFSON
Mayor and Presiding Officer
Approved as to form and correctness:
ALAN C. JENSEN, ESQUIRE
City Attorney
ATTEST
DONNA BUSSEY
City Clerk
th day of
March 27, 2006 regular meeting