07/30/1991
DATE
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ENVIRONMENTAL ADVISORY BOARD
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Special Session
ENVIEONMEN~AL ADVISORY COMMITTEE
Ju1y 30, 1991
Members Present:
wil~ian C. Jonson, Harold W. Hunt,
Peter Reuter, Will Perry, Mike Foley,
George Davis, and Ed Mazur,
Also Present:
T. H. Miller, Assistant Directorj
Environmental; Ray Korzeniowski,
, Clearwater Chamber; steve Fallen, Bob
Maran, City civil Engineer, Richard
Eckenrod, Director Tampa Bay National
Estuary Program and Viola Wasilewski
(Recording Secretary)
Excused
Charles DeBlaker, Ann Garris and Sue
Espey
The special meeting was cal~ed to order at 2:05 P.N. by Mr. Jonson
in the DRC Conference Room at the City Hall Annex on July 30,
1991.
General Summary
A special neeting was called at the request of the city Commission
to obtain comments from the Environmental Advisory Committee
relative to the proposed stormwater Retrofit Ordinance.
The Ordinance was originally considered on July 25, 1991, and had
been postponed to August 15, 1991. Mr. Baker gave a summary of the
Ordinance explaining the development standards. As a result of
this meeting, the attached recommendations as prepared by the
subcommittee were submitted to the Mayor and conunissioners for
their information.
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Mr. Miller also addressed the committee. He explained that the
city's budget included a contribution to the Estuary Program, which
was presented to the City commissioners, along with comparative
contributions from other local governments. Mr. Miller introduced
Mr. Richard ECkenrod, Director of Tampa Bay Estuary Program. Mr.
Eckenrod gave a presentation to the conunittee members on the
Estuary Program and the funding of this program and requested the
support of the Environmental Advisory Conunittee.
A Motion was made by the committee recommending the city of
Clearwater continue full participation and cooperation in the
National Estuary Program because it would be beneficial. Motion
carried unanimously.
Next meeting to me held August 2~, 1991, at 4:00 P.M.
Meeting adjourned at 5:05 P.M.
Respectfully submitted by Viola Wasilewski, Recording Secretary
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CLEARWATE
POST OFFICE BOX 4740
The Honorable Rita Garvey and City Commissioners
city of Clearwater
112 S. Osceola Avenue
Clearwater, Florida 34616
Dear Mayor Garvey and City commissioners:
The Environmental Advisory Board of the City of Clearwater met in special session
July 30, 1991, to consider the proposed Storm Water Retrofit Ordinance. The
following committee members were present, ~l'- Perry, Hr. l1azur, Mr. Foley, Mr.
Davis, Mr. Hunt, Mr. Reuter and Hr. Jonson. hieD present and invited to present
information were guests: Steve Fallen and Ray Korzeniowski.
The committee submits the follov:ina recomroendations pertaining to the draft
ordinance:
1. The wording of the supplemental documents (page 5, paragraph 2) be
more specific in defining redevelopment requirements. staff informed us
t~at the intent of the ordinance is to require retrofit in proportion to
the amount of the property being re-developed. A possible reading of the
Design Criteria could imply that any redevelopment would trigger retrofit
to the entire property. It is also suggesced that the document detail the
kind of building permit work which is used to calculate this proportion
(interior remodeling is not, converting a part of the parking lot to a
building is, repaving a parking lot wi~h a similar surface is not, parking
lot regrading is, etc.) (Vote 7-01)
2,. The committee supports the staff I s interpretation that the amount of
the retrofit be proportional to the amount of redevelopment on the
property - up to a point. We suggest the Commission consider the
establishment of a threshold percentage where the entire site would be
required to be brought up to new development standards. However, we
recommend that this threshold point be established after consideration of
similar ordinances in adjoining pinellas communiti.es so as no~ to create
a competitive disadvantage for Clearwater. (Vote i-01)
3. The committee recommends against establishing an exemption from the
ordinance for the Clearwater Downtown District. (Vote 7-01) However, if
there was a prior commitment to exempt this district from drainage
requ~rements, that commitment should be honored through alternative means
available to the City_ (Vote 6-1) Information available at time of the
committee meeting could no~ confirm or deny that such a commitment had
been made.
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C L E l\ R W AlE R. F LOR IDA 3 4 6 1 0 . 4 7 4 8
August I, 1991
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The Honorable Rita Garvey and City Commissioners
August 1, 1991
Page 2
.
The committee also reviewed the budget proposal to participate in the Tampa Bay'
National Estuary Program. The committee supports full participation and
cooperation in this program as proposed in the budget, This recommendation is
based on a review of the NEP plan and the benefits to the City of Clearwater from
the program (Vote 6-0)
Sincerely,
.~e.
William C. J
Chairman
'. ..,~
cc: Mike Wright, City Manager'
W. C. Baker, Director of Public Works
Tom Miller, Assistant Director of Public Warks(Environmental
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CLEARWATE
C LEA R W A 1 E R, F LOR I D A 3 4 G
POST OFFICE BOX 4748
August 16 1991
The Hono~able Rita Garvey and City Commissioners
City of Clearwater
112 s. Osceola Avenue
Clearwater, Florida 34616
Dear Mayor Garvey and City Commissioners:
The Environmental Advisory Board of the City of Clearwater met in ,Bpecial session
July 30, 1991, to consider the proposed Storm Water Retrofit Ordinance. The
following committee members were present, Hr. Perry, Mr. Mazur, Mr. Foley, Mr.
Davie, ~r. Hunt, Mr. Reuter and Mr, Jonson. Also present and ~nvited to present
information were guests: Steve Pallen and Ray Korzeniowski.
The commit.:tee submits the following recommendations pe.!:"taining to the draft
ordinance:
1. The wording of the supplemental documents (page 5, paragraph 2) be
more specific in defining redevelopment requirements. Staff informed us
t~at the intent of the ordinance is to require retrofit in proportion to
the amount of the property being re-developed. A possible reading of the
Design Criteria could imply that any redevelopment would trigger retrofit
tq the entire property. It is also suggested that the document detail the
kind of building permit work which is used to calculate this proportion
(interior remodeling is not, converting a part of the parking lot to a
bu~lding is, repaving a parking lot with a similar surface is not, parking
lot xegrading is, etc,) (Vote 7-01)
2_~he conunittee supports the staff's interpretation that the amount of
the retrofit be proportional to the amount of redevelopment on the
property up to a point. We suggest the Commiss ion consider the
est.abLishment of a threshold percentage where the entire site would be
requ.ired to be brought up to new development standards. However, we
recommend that this threshold point be established after consideration of
simi~ar ordinances in adjoining Pinellas communities so as not to create
a competitive disadvantage for Clearwater. (Vote 7-01j
3. The committee recommends against establishing an exemption from the
ordinance for the Clearwater Downtown District. (Vote 7-01) However, i:
there was a prior commitment to exempt this district from drainage
requirements, that commitment should be honored through alternative means
av~1able to the City. (Vote 6-1) Information available at time of the
comm~ttee meetin; could not confirm or deny that such a commitment had
beeJ:1 made.
"'
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The Honorable Rita Garvey and City Commissioners
August 1, 1991
Page 2
.
The committee also reviewed the budget proposal to participate in the Tampa Bay'
National Estuary Program. The committee supports full participation and
cooperation in this program as proposed in the budget. This recommendation is
based on a review of the NEP plan and the benefits to the City of Clearwater from
the program (Vote 6-0)
Sincerely,
~e:
William C. J
Chairman
. ~ <!' .,...'?!
cc: Mike Wright, City Manager'
W. C. Baker, Director of Public Works
Tom Miller, Assistant Director of Public Works/Environmental
.
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POST OFFICE BOX 4748
CI'l"'Y
o F C 1../ E A .R W ATE R
C LEA A W ATE R, F LOR IDA 3 <1 6 1 b. 4 74 8
August 1, 1991
The Honorable Rita Garvey and City Commissioners
City of Clearwater
112 s. Osceola Avenue
Clearwater, Florida 34616
Dear Mayor Garvey and City Commissioners:
The Environmental Advisory Board of the City of Clearwater met in special session
July 30, 1991, to consider the proposed storm Water Retrofit Ordinance. The
following committee members were present, Mr. Perry, Mr. Mazur, Mr. Foley, Mr.
Davis, Mr. Hunt, Mr. Reuter and Mr. Jonson. Also present and invited to present
information were guests: steve Fallen and Ray Korzeniowski.
The committee submits the following recommendations pertaining to the draft
ordinance:
1. The wording of the supplemental documents (page 5, paragraph 2) be
more specific in defining redevelopment requirements. staff informed us
that the intent of the ordinance is to require retrofit in proportion to
the amount of the property being re-developed. A possible reading of the
Design Criteria could imply that any redevelopment would trigger retrofit
to the entire property. It is also suggested that the document detail the
kind of building permit work which is used to calculate this proportion
(interior remodeling is not, converting a part of the parking lot to a
building is, repaving a parking lot with a similar surface is not, parking
lot regrading is, etc.) (Vote 7-01)
2. The committee supports the Staff's interpretation that the amount of
the retrofit be proportional to the amount of redevelopment on the
property - up to a point. We suggest the Commission consider the
establishment of a threshold percentage where the entire site would be
required to be brought up to new development standards. However, we
recommend that this threshold point be established after consideration of
similar ordinances in adjoining Pinellas communities so as not to create
a competitive disadvantage for Clearwater. (Vote 7-01)
3. The committee recommends against establishing an exemption from the
ordinance for the Clearwater Downtown District. (Vote 7-01) However, if
there was a prior commitment to exempt this district from drainage
requirements, that commitment should be honored through alternative means
available to the City. (Vote 6-1) Information available at time of the
committee meeting could not confirm or deny that such a commitment had
been made.
o
"Equal Employment and AffirmatIve Action Employer"
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The Honorable Rita Garvey and city Commissioners
August 1, 1991
Page 2
The committee also reviewed the budget proposal to participate in the Tampa Bay
National Estuary Program. The committee supports full participation and
cooperation in this program as proposed in the budget. This recommendation is
based on a review of the NEP plan and the benefits to the City of Clearwater from
the program (Vote 6-0)
Sincerely,
William C. Jonson
Chairman
cc:
Mike Wright, City Manager
W. C. Baker, Director of Public Works
Tom Miller, Assistant Director of Public Works/Environmental
" '.. ' .'.. . '.' .: ~ ,- :, ' .. .' , .: +.~. .' 0 . ," . . . ... '..', , . ,.,. " :. .
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CLEARWATER CITY COMMISSION
Agenda Cover Memorandum
pw ,
Item Ii
Meeting Date 7-18-91
SUBJECT: Ordinance requiring redevelopers of property to abide by same standards
relating to stormwater as first time developers.
RECOMMENDATION/MOTION: Pass Ordinance 115105-91 on first reading.
~ And that the appropriate official be authorized to execute same.
BACKGROUND: Property undergoing development within the City of Clearwater has for
the past many years been subject to stormwater detention and treatment
requirements based primarily upon the extent of impact the development
occasioned. In the case of redevelopment of property which was at the time of
its initial development not subject to any stormwater requirements and therefore
extensively paved or otherwise impervious, the impact of the redevelopment is
often a betterment to the stormwater situation, and. the developer
circumstantially avoids having to provide stormwater facilities. This is a
double circumvention of stormwater requirements in that at initial development
no requirements were in effect, and at the subsequent redevelopment no
requirements are necessitated due to its having no. negative impact (in actuality
a betterment) upon what previously existed.
In our Comprehensive Plan we pledged to eliminate that inequity by adopting new
retrofi t standards relative to storrnwater requiremertts. This was in fact
accomplished by the City Engineer in January, and redev~lopers have been subject
to the new requirements since that time. See attached memo, Baker to Rabun,
dated December 21, 1990. The subject Ordinance has been written for the purpose
of specifically ordaining the actions of the City Engineer and for certain
streamlining included with this opportunity.
The Planning and Zoning Board unanimously approved the ordinance as written at
its meeting of July 2, 1991.
Downtown interests hav~ expressed, through the Chamber of Commerce, a desire that
the Urban Center zoning area be exempt from code requirements relating to
stormwater detention. While the ordinance has not been brought forward with any
exclusionary language, City staff has no problem with such an exemption inasmuch
as the downtown area is already the recipient of certain special considerations
designed to encourage redevelopment. Should the commission wish to exclude the
downtown area from the requirements of this ordinance, language to do so is
available for consideration.
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Reviewed by:
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\ AOI NA
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. Other NA
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Submitted 0,.:
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C 1 ty Ma nager
Originating Dept.
Pub 1 i c Works
Costs :
NA
Co.mission Action
User Dept:.
wcJi
(Current FY)
Approved
Approved
w/cond1t;ons
Funding Source:
Capt. 1111).
Denied
Advert i sed:
Ooerat:ing
Cont'd to
Date:
Other
Paper:
No t requ i reG
Affectea parties
notified
Appropriatlon Code\s)
Attachments:
Ord i nance
Hemorandum dated 12/21/90
Not ~qu~red
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ORDINANCE NO.5105-91
AN ORDINANCE OF THE CITY OF CLEARWATER, FLORIDA,
RELATING TO THE LAND DEVELOPMENT CODE; CREATING SECTION
136..031, CODE OF ORDINANCES, ADOPTING STANDARDS AND
SPECIFICATIONS FOR STORMWATER DETENTION FACILITIES, AND
PROVIDING FOR PAYMENT IN LIEU THEREOF; AMENDING SECTION
137..010, CODE OF ORDINANCES, RELATING TO SITE PLANS AND
STORMWATER DETENTION REQUIREMENTS FOR DEVELOPMENT
PROJECTS FOR HHICH SITE PLAN APPROVAL IS REQUIRED;
PROVIDING AN EFFECTIVE DATE.
WHEREAS, Policy 23.1.4 of the comprehensive plan of the City states that
the City shall adopt a stormwater ordinance requiring redeveloped sites, other
than single-family residential areas, to incorporate water quantity and quality
controls consistent with new development regulations, recognizing that case-by-
case limitations may call for partial controls, off-site improvements, or
pa~nents in lieu of improvements to achieve this goal; and
WHEREAS, the City Engineer has prepared development standards and design
. '
specifications relating to storllMater drainage and detention, known and referred
to as "Design Criteria, Storm Drainage--City of Clearwater, II a copy of which is
.
attached to this ordinance as Exhibit A and incorporated herein by reference,
pursuant to which the developers of both redevelopment projects and initial
development projects are required to attenuate storrnNater flow and provide
certain water quality features; and
WHEREAS, the development standards and'design specifications relating to
stormwater drainage and detention are consistent with and satisfy the
requirements of Policy 23.1.4 of the comprehensive plan of the City, and should
be adopted by ordinance; now, therefore,
BE IT ORDAINED BY THE CITY COMMISSION OF THE CITY OF
CLEARWATER, FLORIDA:
Section 1. Section 136.031, Code of Ordinances, is created to read:
Sec. 136.031.
Stonnwater detent; on f ac ; 1; t; es ; standards and
specifications adopted; payment in lieu thereof.
(1) The development standards and design specifications r'elating to
stormwater drainage and detention, a copy of which is attached hereto as Exhibit
A, are hereby adopted and i nc'orporated here; n by reference. Copi es of such
standards and specifications shall be maintained on file in the office of the
City Clerk and ;n the Public Works Department. The standards and specifications'
shall not be amended except by ordinance.
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Stormwate~ detentior. fac~11ties
reQU ired b v the standartis
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and
spec~ficiatio"$ but wtl1ct:, In the ooiniof'l of th~ city en~pneer, would De
tmorac-: -1 ca 0- ~ neffect 1 \Ie :lecause o~ toe 5 '! ze of the orooeny I the spa.ce
(PV51<)
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available for stormwater detention facilities, soil conditions, or other site
related conditions, may be waived at the request of the developer upon payment
to the city of a fee in lieu thereof which shall be used by the city solely for
drainage improvements in the drainage basin in which the property is located.
Such fees shall be determined by the market value of the area of land which would
have otherwise been required to accommodate a storm~ater detention facil ity,
according to an appraisal made by the city or by a property appraiser holding
either an MAl or SRPA designation, at the option of the property owner, and by
the construction value of the storlT1\'later detention facil ity that would have
otherwise been provided, such-:onstruction value to be determined by the city
engineer. Subject to the approval of the city engineer, the developer may
install a portion of the required stormwater detention facilities and pay the
city a fee in lieu of installation of the remaining portion of the facilities.
Section 2. Paragraph (4) of Subsection (g) of Section 137.010, Code of
Ordinances, is amended to read:
Sec. 137.010. Site plans.
*
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*
(g) Design guidelines for site plan review. It is the purpose of these
design guidelines to supplement the standard requirements of the comprehensive
individuJl land use plan and land development'code zORing atlas classificatioAs
in a manner that recognizes the need to tailor the land planning process to the
unique features of each site, while preserving the right of reasonable use of
private property~ascd upon the uses pcrmitted under the laRd use plan and zoni~
atlJ~ -',~-~~iE.~ieR~ ~~-inr~~ ~n .h~ ~re~ert\l
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The following itc~s shall be
glven full consideration in the preparatioR and review of site plans required
under this section. Before Furthermore, before any final site plan is granted
approval (whether conditionally or unconditionally), it shall first be estab-
lished that such plan 15 consistent with the design guidelines of this section.
If Hhcfl it is determined that a final site plan does not satisfactorily comply
with one or marc, in whole or in part, of any of the design criteria contained
herein, the city shall have the authority to deny the site plan.
o_uidelines to be considered sha11 include Th f 11
~,e 0 ow i n g :
Design
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( ,; Str~ts , drainage and uti 1 ities. Site plans shall be -56- aes;gned -as
~c orcv1Qe 70r adequate st;e€ts
water SUPDi!, se~age aisDosa;, refuse
collection.L ~ storTlMlater detention~nd other public service and utility
facilities, as fo1 lows. Those specific factors to be cva1uatcd in determining
-that these rneaSl:Ife shave becn adequate 1)' _1ddressed i nc lude the fo 11o'.'li~:
a. Citywide water supply and sewage treatment capabilities, by district
where applicable.
b. Water mains, fire hydrants and water meters.
c. Sewer mains and manholes.
d. Gas mains, where applicable.
e. Provisions for refuse disposal, including container location and
access thereto.
f. Easements for all utility lines.
g. . StorrTh'later L oca t ion, capac i ty and des i gn of storm..-JJter detent ion
facilities, both as to the site Jnd the watershed or basin, or payment in lieu
thereof as provided in section 136.031 herein. The location, adequacy, and
desiqn of stormwater detention facilities shall be evaluated both as to the site
and the watershed or basin.
The responsibility of the owner and the owner's
successors in tit le or i nteres t for the ma i ntenance and -'appearance of stormwater
detention facilities shall also be established.
h, !1espoAsi bi 1 ity for fila intcnance and .Jppearance of stormwater detent ion
facilities.
h +. Sufficiency of adjacent streets.
All of the above requirements factors shall be satisfied determiAcd consistent
with the objectives of the utility plan and current development standards and
design specifications of the city engineer, and the standards and soecifications
relatinq to stormwater drainaqe and detention set forth in section 136.031. It
shall be the objective of this guideline to assure that adequate service capacity
is available and that utility, street "ana drainage systems are appropriately
designed for the proposed developmrent site in relationship to the larger systems
entering and leaving .the site. Storm-l:J.tcr detontion f:J.cilitie:: '.Ihich. in the
opinion of the city cngiflccr, would be impr~c~ic~l or incffccti~e ~ccau~e of the
size of the property, the space av~ilJblc for stormwater detention fJcilitics,
soil conditioRs 9r other site rcl.Jtcd condition~, ffi.JY be deleted at the request,
Gf the de'le lo~cr l:ijXJn J3a~eRt to the city of .J fee in 1 i Cl:.I tRcrcof 'Nh i ch :R~ 11
Be YSea b~' the ci~y solely for draiAage i~raYc~Rt: in the sra;nage BasiA iR
~IAich the eroser1:\' l s 19catca. S..u:h fees SAd 1 ~ ge eetCMH;ReS BY tRc RlaYket va h..e
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of the a rea of 1 and 'I_'h; ch waul d have otherw i ~e been rcqu ired to accommodate .:l
sterlR\</atcr detent i on f JC i1; ty / Jccord i ng to an apprJ; sa 1 ma{je by tAc city or by
a property .:lppraiser holding either In M^I or SRPA designation, at the option ~
the property O\'mer, Jnd by the construct ion \'J lue of the storRM'atcr detent; on
facility that would havc otherwise been provided, such value to be determined by
the city e ng-i necr I Subject to t he appro',' J 1 of the city cng i neer I the deve loper
may inst.Jll J portion of the reql1 ired ~tonrn"uter detention facil itics and pa,y the
tit}' .:1 fee in l;c~ of installation of the remaining portion of the facilities.
.
Section 3. This ordinance shall take effect immediately upon adoption.
PASSED ON FIRST READING AS AMENDED
PASSED ON SECOND AND FINAL
READING AND ADOPTED
Rita Garvey
Mayor:Commiss;oner
Attest:
Cynthia E. Goudeau
City Clerk
Approved as to form
and correctness:
M. A. Galbra;t~, Jr.
City Attorney
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C I T Y 0 F C LEA R W ATE R
Interdepartrnent Correspondence Sheet
TO:
Ron H. Rabun, City Manager
~~ C ,/f'~
William C. Baker, DiT8ctor of Public Works
FROM:
COPIES:
C. Hunsicker, Asst. City Manager; J. Polatty, P&D Dir.;
M. A. Galbraith, Jr., City Attorney; C. M. Henderson, Jr.,
ADPW/Eng.; T. Miller, ADPW/Env.; ~. Jennings, Chief Eng. i
R. Maran, Civil Eng. III; Mayor & Commissioners
SUBJECT:
Stormwater Retrofit Considerations
DATE:
December 21, 1990
The 'Land Development Code of the City of Clearwater, in Chapter 137
Administration and Enforcement, Section 137.010 Site Plans, paxagraph
(g) Design guidelines for site plan approval, subparagraph (4) Streets,
Drainage, and Utilities; states that llall of the above factors"
(referring to a list of considerations relating to stormwater detention
and other development features) "shall be determined consistent with
,the objectives of the utility plan and current development standards
and design specifications of the City Engineer".
The current development standards and design specifications, relating
to stormwater, to which developers are required to adhere are published
in our blue booklet entitled Desiqn Criteria Storm Drainaae - Citv of
Clearwater, updated from time to time, and most recently published in
April, 1988.
The methodology described ~n the criteria, for the purpose of
determining the amount of storrnwater detention to be provided by
developers, entails a calculation of the amount of stormwater volume
actually generated by the development and a requirement that that
amount be attenuated. In this methodology developers who change the
character of the l~nd, generally by the construction of buiLdings,
p~rking lots, and driveways, where there formerly was vacant,
relatively pervious, undeveloped land, must detain an amount of water
for flood protection equal to the amount by which their development'
increased its flow.
In the case of redevelopment the same criteria applies. However, in
some instances the original development took place prior to an~ rules
requiring detention and, inasmuch as ~~e proposed redevelopment often
will result in less stormwater generation than is already present,
~calculations result in no requirement for detention and the redeveloper
escapes the responsibility for the second time - at the original
development where there were no rules requirLng detention, and at the
redevelopment event where there is an actual decrease Ln sto~ater
flow.
~long with this circumstantial circumvention OI d7tentLon requir~ments
relative to attenuation of flooding waters there ~s an accompany~n~
circumvention of certain separate but equally-important water-qual~~y
considera~ions. In the normal development situation builders are
required to accommodate the increased storrnwater flow for flood-control
d - as (con~rd)
purposes as well as provide, either in a separate ev~ce or ~
(gl/&f{)
....
M~mo to: Ron H. Rabun, City Manager
Page 2 (continued)
a built-in feature of the detention pond, water treatment components
which usually take the form of littoral shelves with planted vegetation
to remove nutrients. Because the state agencies require these water
quality features in all incidents of development, and because of the
benefits of uniformity, the water-quality requirements of the city of
Clearwater are the same as the State's, In the case of redevelopment,
however, the State's rationale relative to water 'quality is similar to
the City's rationale relative to attenuation and some developers
circumstantially circumvent these requirements also.
In the Drainage element of our present Comprehensive Plan, we state in
Policy # 17.1.4 (page 90) that we will eliminate this situation and
require redevelopers to provide stormwater detention and water quality
features, notwithstanding that the redevelopment does not increase
storm flows above that which is already present or that water quality
is not degraded, but rather on the grounds that there is an increase in
both over what was originally present before the original development.
In this manner we essentially will be returning to the original
development, by vixtue of the redevelopment, and requiring the
detention and watex quality features that were not then required.
As is already the case, developers who claim an inability to provide
the required stormwater features on the grounds of aberrant
circUlllstances, may make their case for "payment-ip-lieu-of" andl if
successful, provide a payment equal to the cost that would have been
involved had they provided the facilities, for use in funding
subsequent city-sponsored improvements in the same drainage basin.
It is intended to abide by the spirit of the comprehensive plan and to
correct the avoidance circumstance by issuing an amendment to page 5 of
our Design CIiteria manual consisting of the insertion, at the end of
the first paIagraph, of the following language: ".In the case of
redevelopment of land upon which no stormwater attenuation or water
quality feature eKists, or upon which the existence of such features do
not meet the standards applicable at the time of redevelopment, the
redeveloper will be required to provide all facilities in the same
manner as an original developer. In the methodology for calculating
stormflow, a predevelopment runoff coefficient of .37 will be assigned
to all redevelopment property excepting where it can be clearly
demonstrated that a different coefficient more accurately reflects the
actual conditions originally existing. Redevelopers are required to
provide water quality features for the first 1/2 inch of rainfall in
the same manner as original developers". We will likewise insert a new
runoff coefficient into the list appearing on Page one by placing
~"Impervious areas undergoing redevelopment -- .3i for pre-development
C," between the coefficient listed for tUIfblock and green areas.
This simple amendment wi~l e~Lminate the opportunity for a redevelope=
to avoid ~he xequirement to provLde stormwater detention or water
qua~~ty xeatures zar a prevLously developed site, have no effect an ~he
calcuLations in the methodology no~ associated with redeveloomen~, and
accomplish the objectives of the Comprehensive 'Plan. ~
Unless you 0= others have suf=icient reasons not to. the office of the
C~~y Sng~n~= will, before Janua~ ls~ ~ub1ish and'd~str~~u~p- i~ -he
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no~a~ ~=s ~O~ a ~7w P~ge one and =ive o? OU= c=iteria makina the new
des~gn s~anda_d e~~e~~~ve Februa~F 1 - 10Q1 -
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ENVIRONMENTAL ADVISORY COMMITTEE
.s: pect' # L. H c-e7/tV5
Meeting Date:
~ '-~C! 19?1'"
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Attendees:
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D.ESIGN
CRITERIA
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DRAINAGE
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STORM.
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CITY OF CLEARWATER
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CITY OF CLEARWATER
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DEPARTMENT OF PUBLIC WOILKS
STORM DRAINAGE DESIGN CRITERIA
INTRODUCTION
This manual is a guide- to assist Engineers in the desi.gn of
stormwater systems in the City of Clearwater. In general these
standards are a combination of requirements set by the Southwest
Florida Water Management District as administered by the Pinellas
Co:.'" County, Department of Environmental Management and requirements set
,;;:' by the City of Clearwater, Public Works Department. This manual
does not propose to itemize the requirements of the Southwest
Florida Water Management District, but to highlight and detail the
requirements of the City of Clearwater. The Designer is required
to be familiar with the current design requirements of Southwest
Florida Water Management District. The appropriate Southwest
Florida Water Management storm water permit will be required prior
to any final construction permi.t approval by the City of
Clearwater.
The Designers attention is called to the City of Clearwater
requirement that all development and redevelopment will require
provisions for storm water management. ,In particular,
redevelopment wi 11 be required to provide the same storm water
management system as if the property was being originally
developed.
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Ponds, lakes and detention area (wet or dry)
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STORMWATER MANAGEMENT
DESIGN CRITERIA
1. GENERAL:
All construction shall comply with the Ci ty of Clearwater Contract
Specifications and Standards Manual. All stormwater facility designs
must be designed and certified by a Florida Registered Engineer.
Record drawings shall be submitted and certified by a Florida Registered
Engineer before final acceptance of project.
Desion Frequency
(a) - 10 Year -
(b) - 25 Year -
(c) - 50 Year -
(d) - 100 Year -
storm systems, culverts
channels and detention areas with outfalls
detention areas without outfalls
detention areas without outfalls which when
capacity is exceeded overflow onto private
property
Runoff Coefficients:
Buildings, paved areas, and other impervious areas .95
Turfblock .45
Impervious sites undergoing redevelopment .37
Green or pervious areas .20
Design coefficients shall be obtained by using the above coefficients on
a weighted run off method for both pre-development and post-development.
2 . STORM DRAINAGE:
Detention areas must be built before storm sewers are, installed. Slopes
shall not be steeper than three to one, (3 : 1) and shall be protected
from erosion by sod.
Time of Concentration
Time of concentration to first inlet on a system shall be determined by
using velocity of runoff chart. (Chart attached). A minimum time of 15
minutes to first inlet shall be used.
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January - 1991
1
Unless specifically approved by the City Engineer, rein~orced
pipe shall be used in all easements and street rights-of- way.
size shall be 15" diameter. Design frequency - 10 year storm.
Roughness coefficient for storm pipe:
concrete
Minimum
Mannings
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3. STORM SEWERS, INLETS, AND STREET DESIGN PERTAINING ':rO WATER FLOW
( a)
RCF
15"
36"
54"
- 30" inclusive
48" "
up
N
.013
.012
.011
· .023
.018
(b) CMF or Aluminum
Asphalt coated
(c) PVC Storm Drain Pipe
.009
The slopes for culverts used as storm sewers shall produce a velocity
within the following limits:
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Maximum
CMP 10 f.p,s.
Rep 12 f.p.s.
Minimum
2 f.p.s.
2 f.p.s.
Standard hydraulic gradient elevation shall be minimum of 1.0 foot below
throat of inlet or manhole.
Minimum Culvert Size:
(a) - Pipe 15"
(b) - Box Culvert - 3' x 3'
Maximum 'length of pipe without access structure:
(a) - (15" - 18") Pipe - 350 ft.
( b ) ( 24" - 3 6 ") Pipe - 4 0 0 ft.
(c) - (42" & cover & all box culverts) - 500 ft.
(-
January - 1991
2
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4. rNLETS Ah~ MANHOLES:
Vertical throat opening for inlets shall be 511.
Inlets and manholes will be designed so as not to have standing water
when not functioning.
All inlets to have manhole lids in accordance with City standards.
Inlets are not to be placed in curb return.
Pipes are to be cut flush with inside wall of inlet.
Subdrain shall enter structure a minimum of one foot above invert and 2'
611 below top of structure.
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When pipe diameter exceeds 30", inlets shall not be used as junction
boxes, limit 3 pipes per inlet.
For design purposes inlet capacity should be assumed as follows:
5" Throat
Grate Inlet *
(No Wing Type *
(Single Wing Type
(Double Wing Type
4 CFS
5 CFS
7 - 8 CFS
9 - 10 CFS
~ - Subject to City Engineer's approval only.
Standard inlet wings shall be a minimum of four feet in length as per
City Standards.
5. STREET DESIGN:
Generally gutter water should not be carried for distances exceeding 600 I
feet.
Channeling water across intersections subject to City, Engineer's
approval.
Normal Grades - .5% up to 2%
Steep Grades - greater than 2%
Inlet Spacing
600 ft.
400 ft.
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January - 1991
3
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STREET DESIGN: (continued)
Where grades exceed 2%, a 6' wing will be required on the inlet. Grades
less than 0.5% are subject'to City Engineer's approval only. A minimum
of 0.5% grade shall be required for asphalt drives and parking lots.
Right-oi-way shoulders shall be sodded three feet behind curb and
remainder, graded, seeded, and mulched. Mulch to be dry or green per
D.C.T. 981-4.
6. HEADWALLS:
All inlet and outlet pipes shall be provided with a headwall, mitred and
section, or flared end section. Headwalls in residential areas shall be
reinforced concrete. Pinned Sand/Cement bag structures builtin
accordance with City of Clearwater specifications may be permitted
subject to City Engineer's approval. Sand cement bag slope protection
shall be provided where storm pipes outfall into channels. All outlets
shall have an appropriate apron to prevent erosion.
7. CHANNELS AND SWALES:
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Rouqhness Coefficient - for a channel with maintained vegetation is .030
to .035.
Normal channel depth shall not be within 10% of critical depth. When
velocities exceed maximum allowable values energy dissipators shall be
provided. Plans shall include undeveloped areas, pre- development
drainage, and pre-development discharge at key design points such as
channels, existing ponds, sloughs, 'etc. Also post- development
calculations for storm runoff and proper detention shall be determined.
Type of Soil
in Flow Line
Maximum Allowable
Velocity (f.p.s.)
Fine Sand
Sandy Loam
Silt Loam
Firm Loam
Fine Gravel
Stiff Clay
Coarse Gravel
Hardpan
1.5
1.8
2.0
2.5
2.5
3.8
4.0
6.0
Major channels (Q greater than 30 CFS) shall have a five foot bottom
width. Drainage swales normally will not be permitted along rear lot
lines.
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Swales shall be vegetated and designed for a 50 year storm.
January - 1991
4
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8. STORM WATER DETENTION:
This policy is to insure that runoff will not be increased beyond its
present state by development. It is also intended to protect the
quali ty of receiving waters in the Ci ty from additional pollution
resulting from new development. The design frequency shall be a 25 year
storm based on rainfall intensity graph for the Clearwater area. The
duration may be obtained from the Rational method for areas.up to 10
acres. Design variations may be considered for areas less than one
acre. The runoff coefficient differential DELTA C is obtained by
subtracting pre-development coefficient from post-development
coefficient.
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'.
"In the case of redevelopment of land upon which no stormwater
attenuation or water quality feature exists, or upon which the existence
of such features do not meet the standards applicable at the time of
redevelopment, the redeveloper will be required to provide all
f acil i ties in the same manner as an original developer. In the
methodology for calculating stormflow, a pre-development runoff
coeff icient of .37 will be assigned to all redevelopment property
excepting where it can be clearly demonstrated that a different
coefficient more accurately reflects the actual conditions originally
existing. Redevelopers are required to provide water quality features
for the first 1/2 inch of rainfall in the same manner as original
developers" :
Q "
6Q = 6CIA
I TillE OF L
---J CONC~HTRATlON
1... OUR~TION
I
t (See,)
The design hydrograph is an isosceles
triangle with a time of concentration equal to
one half of the duration. Detention design
shall incorporate ami n i mum t i m e 0 f
concentration of one hour and a 25 year storm
intensity. The outfall shall be restricted to
accommodate the pre-development flow with
appropriate overflow facilities for larger
volumes. Detention ponds will no longer
require one foot of freeboard.
I
1
Volume of detention may be established by multiplying time of
concentra tion times DELTA Q providing the outlet control structure
(weir, pipe, etc.) is designed to restrict other than pre- development
Q. An outfall design allowing less than the pre- developed Q to pass is
acceptable if storage is provided.
(
~....
January - 1991
5
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I' ~ '. \'
" ' .'. .' . .. ..' '. ' I .' ! '.. . . ' . , ~ , '. .. .. ," '. ' . '. . I '. .' '. ..' , . "
('
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.
Discharge to Lake or Wetland
In situations where the pre-developed Q abuts a lake or wetland, the
developer may store additional rUIlof f above that required for ",Tater
quality treatment in the wetland subject provided that the following
conditions are met:
Wetland with positive outfall has the capacity to store a 25 year
design storm.
Wetland with no outfall has the capacity to store a 50 year design
storm.
Wetland has sufficient capacity to absorb additional runoff.
All areas on or off site contributing to a wetland shall be included in
the design. Runoff discharging directly to the wetland shall be
transmitted via grassed swales. Runoff from lots abutti~g a wetland
shall be collected in an interceptor swale designed to drain dry in I
less than 24 hours. .
(
''\,.
The maximum design high water elevation of the wetland shall be one foot
below the lowest floor elevation around the wetland or one foot below
the flow line of the nearest adjacent road, whichever is lower. The
design wetland elevation shall be determined by the inflow and outflow
hydrograph method.
The impact to the wetland system will be taken into consideration when
reviewing these applications. Those areas directly outfalling tidal
salt water basins will be reviewed for water quality impacts only.
Dry Detention Systems
\
i
Dry detention systems are those that under non storm conditions are dry,
ie., has a grassed bottom and side slopes that can be mowed. These
systems shall be designed with no steeper than 3: 1 side slopes,
preferably no deeper than three feet deep and drain dry within 24 hours
or less. The side slopes and bottom shall be
- sodded. Drawdown may be accomplished by the use of underdrain according
to City specifications or by percolation if the soil conditions permit.
At least one soil boring showing soil profile and the seasonal high
water table shall be provided with the site plan. The soil boring
shall be located at the center of the proposed detention area.
,.
~
\.~,
January - 1991
6
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\,' I '. ".
. t', ~ '. 't . .'. . ,." . . ~ '. .'. I ' '.' ., . '. I.' I ' . ';1 .
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Wet Detention Systems
Wet detention/retention systems are those that under non storm
conditions are designed to have a standing pool of water. The design
shall be in accordance with City Detail Index #227. All wet systems
shall incorporate a vegetated littoral shelf over 35% of the areal cover
of the pond under normal conditions. Drawdown may include an underdrain
system, natural percolation'or slow bleed down system.
Detention Pond Walls
The use of vertical walls on the sides of detention ponds is
discouraged and will not be permitted except as may be
specifically approved due to reason of undue hardship to the
developer. In no circumstance will vertical walls on detention
ponds be permitted adjacent to rights-of-ways, along the
boundaries of adjacent parcels of land or on more than two sides
of a detention pond.
(~"
"
.......- ..
9. SUBMITTALS
,
In addition to submitting complete plans and specifications, the
Engineer shall also submit the following:
A. - Drainage calculations or computations including hydro-
graphs for any detention areas, retention ponds,
complete
with cross sections.
B. - A scale map or plat showing each subdivision drainage
basin, as an aid for review of the proposed work. A
minimum of 50 feet of topographical survey shall be re
quired adjacent to the perimeter of the proposed site.
C. - Profile of hydraulic gradient for storm pipe system.
D. - All pertinent information of adjoining properties affected
by stormwater from site such as finish floor elevations of
buildings, streets, channel or receiving waters to the
final outfall. All adjacent property draining onto the
proposed site is to be shoml on the site plan.
{
'-........'~ .
January - 1991
7
1'" ,
f.
(".
.....-'
(
SryBMITTALS continued:
Before project is accepted by the Fublic Works Department, a
Registered Engineer must submit written verification that the
project was constructed in accordance with approved construction
plans.
10. ATTACHMENTS:
Rainfall - Intensity/Duration Clearwater. This Rainfall
Intensity Graph shall be used for 10, 25, and 50 year storms.
Velocity of Runoff - for use in determining intensity for above
grade runoff.
Drainaqe Desiqn Computations -. suggested for working out drainage
computations showing required information for submittal to City of
Clearwater for approval.
~".
C' , Throttle Type Concrete Outlet for Detention Ponds - Index No. 225
""".'
Dry Detention Overflow Outfall Structure - Index No. 225-A
Underdrain Detail Non-Roadwav - Index No. 205 - Sheet 3, of 4
Wet Detention/Retention Pond - Index No. 227
Subdrain Detail for Dry Detention Areas - Index No. 236
(bO/
January - 1991
8
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FURTHER CONSIDERArrrONS
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1. The Ordinance as proposed begins to eliminate the
circumvention of requirements associated with existing
'imperviousness at redevelopment sites, immediately upon
. ,: ,~,._~J'?y change at. the s1 te. 'l'here is no threshold
,established ~hich a developer must reach before "kicking-
in". the ': new requirement. The developer will be
respons ible for pl:oviding fac.i.li ties (or paymen't in li"eu
of) from the outset. A number could be determined to :
serve as a minimum amount of redevelopment that must be
involved before the requirements take effect.
2. The ordinance a~ proposed will apply the requirements in
dfr8ct proportion to the extent to '\vhich the site plan
for a project is altered. A certain amount of alteration
"'could be determined to represent sufficient redevelopment
"torequire'that the entire site be brought up to'code.
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3., Property owners in the downtown are~ have reques.ted that
.: all property within the Urban Center zone be exempted
, from the requirements, of the ordinance.
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,!;8;:z~~;~:"...: ".,,,4_"'< The va,rJ-,9u~ ..coeffici~nts, ..o~ run~ff used, by ,the . City could
=::;::~:,;:::;.:::.~::": :':":,:::::':-:. be "changed (up. or down),' provided 'they stay 'within'. the'
~2'~:(;-':-""":'''' : ':' individual ranges associated with the rational:' empericism
~~~~iJIL~,:,:,>,'. from which they were derived.
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Some other method could be employed such as - assigning a
pre-development runoff coefficient C, for use in
calculating pre-development stormwater volumes, equal to
1/2 the existing weighted coefficient of runoff - instead
of the .37 assignment proposed in the ordinance.
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