HomeMy WebLinkAboutOrdinance 581 Stormwater Management
ORDINANCE NO. 581
AN ORDINANCE OF THE CITY OF W1NTER SPRINGS,
FLORIDA, AMENDING SECTION 9-241. STORMWATER
MANAGEMENT CHAPTER 9 OF THE CODE OF
ORDINANCES, CITY OF WINTER SPRINGS, FLORIDA,
PROVIDING FOR SEVERABILITY, CONFLICTS AND
EFFECTIVE DATE.
WHEREAS, the City Commission of the City of Winter Springs,
Florida, has determined that the following amendment to the Code
of Ordinances is in the best interest of the City of Winter Springs,
Florida.
NOW, THEREFORE, THE CITY COMMISSION OF THE CITY
OF WINTER SPRINGS, FLORIDA, HEREBY ORDAINS;
SECTION I - That the following Section be amended to read as follows:
Sec. 9-241. Stormwater management.
(a) The design concept for drainage systems in proposed developments
shall be approved by the City Engineer. All drainage systems shall have a
positive outlet or overflow unless documented as being unnecessary by
geohydrologic investigation based on a twenty-five (25) year design storm.
(b) All drainage facilities shall be designed for a rainfall of a twenty-fIve (25)
year/twenty-four (24) hour return period using an SCS Type II Modified
rainfall distribution. The twenty-five (25) year/twenty-four (24) hour storm
is the "design storm".
(c) The drainage system for each subdivision shall include a sufficient facility
to remove storm water without flooding any lot in the proposed subdivision or
in the surrounding territory. All finished floor elevations shall be a minimum of
one and one-half (1 1/2) feet above the hundred-year flood stage.
(d) Retention/Detention Ponds:
(1) Dry Bottom Ponds - All dry bottom retention/detention ponds will
have a pond bottom elevation no less than one (1) foot (12 inches) above
the seasonal high ground water elevation, which is to be determined by a
registered professional engineer in the State of Florida with an expertise in
soils. The side slopes of all dry bottom retention/detention ponds shall not be
steeper than two and one-half (2 1/2) horizontal to one (1) vertical. All dry
bottom ponds "with no exceptions, in which the side slopes are steeper than
four (4) horizontal to one (1) vertical shall require a green vinyl chain link fence
with a minimum height of ( 4) feet. All fences must meet setback requirements in
Section 6-193, Buildings and Building Regulations.
(2) Wet Bottom Ponds - All wet bottom ponds must have side slopes no
steeper than four (4) horizontal to one (1) vertical measured from the top ofthe
berm down to alleast three (3) feet below the Normal Water level measured
vertically. This is the Side Slope Transition Point. Side slopes may then
transition, from the Transition Point, to no steeper than two (2) horizontal to one
(1) vertical down to the pond bottom. Wet bottom pond side slopes steeper
than these values are not allowed. If a fence is used, it must be of the same
specifications as the fence for dry bottom ponds.
(3) All Ponds - Retention, detention, percolation, and treatment of
stormwater are required by the City. Stormwater regulations, criteria and
requirements of the State of Florida, St. Johns River Water Management
District and the Department of Environmental Protection, as they may exist and
be modified from time to time, are to be the regulations, criteria, and
requirements which the City shall utilize for review of stormwater facilities. All
City stormwater requirements shall also apply in addition to any Federal and
State requirement. If there is a conflict between requirements, the stricter
requirement will apply. All ponds shall have a minimum ten (10) foot wide
stabilized maintenance berm capable of supporting a maintenance vehicle.
There shall be a minimum ten (10) foot wide easement to each pond dedicated
to the City and the Homeowners' Association (if planned). All fenced ponds
must have a locked gate with ten (10) foot wide gate opening.
(e) Flow quantities off-site are not to exceed that prior to development. The
stormwater runoff volume and rate from the "design storm", for the post
development condition, shall not exceed that for the pre-development condition.
(f) The City encourages the preservation of existing swamp areas, ponds
(including intemrittent ponds), wetlands and wet areas, and bayheads for water
storage and conservation purposes. Existing flood storage quantities shall not
be reduced by development from that which existed on-site prior to development.
Pre and post-development volume must be adhered to with additional
compensating storage for all floodwater displaced by development below the
elevation of the hundred-year flood as defined by the Federal Emergency
Management Agency on the latest official panel of the Flood Insurance Rate Map.
Compensating storage is to be calculated between the hundred-year flood
elevation and the seasonal high water table. The seasonal high water table shall
be established by a registered professional engineer in the State of Florida with
expertise in geotechnical engineering based on recent soil borings on the subject
site. There must be at least one (1) soil boring per pond, performed at the
proposed location of the pond.
(g) The development of each phase of a development shall be capable of
standing on its own if subsequent areas planned for development are not
developed.
(h) Inlet Spacing - Inlets shall be spaced in such a manner as to accept one
hundred (100) percent of runoff. Typically, the maximum allowable gutter run
will be seven hundred:fifty (750) feet on streets with curbs, unless specifically
excepted by the City Engineer. On streets other than streets with curbs, the
actual required spacing will depend on the characteristics of each particular
site. Calculations will be provided to show the Hydraulic Grade Line (water
level) in all inlets and storm water manholes when the pond reaches its maximum
stage water elevation during the design storm. At no time will the Hydraulic
Grade Line be allowed to be higher than the edge-of-pavement at inlets and at no
time be higher than the manhole rim at storm water manholes. See subsection
9-300 for standard curb inlet. Florida Department of Transportation (FDOT)
inlets may be used at the discretion of the City Engineer.
(i) Lot Grading - To facilitate proper stormwater surface runofffrom residential
lots, the minimum residential lot line slope that can be accepted is one and one
quarter (1.25) percent. This will only be allowed in areas that have good
percolation of rainfall into the soils. In areas that do not have good percolation of
rainfall into the soils, the minimum lot line slope that can be accepted is one and
one half (1.50) percent.
The determination of good percolation of soils will be made by the City Engineer
based on a recent soils report by a registered professional engineer in the State
of Florida with an expertise in soils. The soils report may have to include the
results of a recent soil permeability test if required by the City Engineer.
SECTION II - If any section or portion of a section of this ordinance proves to
be invalid, unlawful or unconstitutional, it shall not be held to invalidate or impair the validity,
force or effect of any other section or portion of a section of this ordinance.
SECTION III - That all ordinances or parts of ordinances in conflict herewith
are hereby repealed.
SECTION IV - This ordinance shall take effect immediately upon its passage
and adoption.
PASSED AND ADOPTED THIS 27th DAY OF MARCH, 1995.
JOHN F. BUSH, MAYOR
ATTEST;
Margo M. Hopkins
CITY CLERK .
FIRST READING FEBRUARY 27, 1995
POSTED FEBRUARY 21, 1995
SECOND READING AND PUBLIC HEARING MARCH 27, 1995
--------------------------------
ihe Orlando Sentinel
Published Daily $71. 40
in the ~EMINOl E
was published in said newspaper in the issue; of 0':1/121'95
Court,
NOTICE OF PUBLIC HEARINU
CITY OF WINTER SPRINGS,
FLORIDA
NOTICE IS HEREBY GIVEN !;lY
the Citv CommisSion of the CIty
of Winter SprinjJs. Florida, that
said CommisSion will ~old a
Public Hearine on an Ordinance
entill~MM~~;NO. 581 \
An Ordinance of the C' of
Winter Springs,. Flori~a .
amending Section 9-241.
Stormwater Management. \
Chapter 9 of the Code of
OrdInances, City of Winter
Springs Florids. prOVIdIng I
for severability, conflicts
and effectiVe date.
This Public Hearing will be held
at 7;30 p.m. on March 27. 1995
or as soon thereafter as POSSI-
ble in the Commission Cham-
bers, Ci!Y ~all. 1126 E.S.R. 434.
Winter SPfl~.r~;-
Copies. -In \M office
~~ ~ CI<<I< tor ln8pecIion.
In\8resltd~ ~~if.h.t
thIs hSllrlng - . -
respeot to .. IIfCIP"M ,orOi-
~~~cgn. wiIh ~ "~e~-
ing asaislanOe to ~ie. '"
any I)f t~ ~llllIs
should ~ tM Em04..e
RelatiO/l8 ~ Al)1\Jiitp-
ordinator 4$ hoUrs In advence
of the meetings at (407) .~,
~~ns are advised that i!'l~y
decide to appeal any declSlOfl6
made at these meetings/hear-
ings they will need a record,of
the proceedings and for s~h
purpGSe, they may niled to-.n-
sure that a verbatim record" of
the proceedings is made, which
includes the testimony and .lIV"-
dence upon which the apD881ls
based. per Section 28&.01 OS
b~~utes. MAR.12,1985
~tatt of jflortba } 5.5.
COUNTY OF ORANGE
Before the undersigned authority personally appeared
J1JANITA FQSll.lJ() , who on oath says
that he/she is the Legal Advertising Re~resentative of The Orlando Sentinel, a dally
news~~er published at (AX~n nFRRY in
~f M ()l E countt' Florida;
that the attached copiS of advertisement, being a NOT ICE OF PURl IC H
in the matter of OR INANCr NO. .5 1
Affiant further says that the said Orlando Sentinel is a newspaper published at
(A S SEt fit RRV , in said
SEMINOLE County, Florida,
and that the said newspaper has heretofore been continuously published in
said SEMINOLE County, Florida,
each Week D1!Y and has been entered as second-class mail matter at the post
office in CASSELBERRY in said
SE MI NOt E County, Florida,
for a period of one year next preceding the first publication of the attached
copy of advertisement; and affiant further says that he/she has neither paid
nor promised any person, ).iJ:q) or corporation any discount, rebate,
commission or refund for ::J; purpose of secu ng thi a vertise nt for
publication in the said new (aper. "
The foregoing instrument was'ac~
~g9~,h JUANITA ROSAOO
who is personally known to me a d w ~r~ oath(!"
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