Florida Administrative Code
40 - WATER MANAGEMENT DISTRICTS
40C - St. Johns River Water Management District
Chapter 40C-41 - SURFACE WATER MANAGEMENT BASIN CRITERIA
Section 40C-41.063 - Conditions for Issuance of Permits
Universal Citation: FL Admin Code R 40C-41.063
Current through Reg. 50, No. 187; September 24, 2024
(1) Within the Upper St. Johns River Hydrologic Basin the following criteria are established:
(a) Storm Frequency - For
purposes of design and evaluation of system performance, both the 10-year and
the 25-year design storm frequencies must be met.
(b) Runoff Volume - For design purposes,
those systems utilizing pumped discharge, the total post-development discharge
runoff volumes shall not exceed pre-development discharge runoff volumes for
the four-day period beginning the third day of the four-day design storm
event.
(c) Interbasin Diversion -
1. A system may not result in an increase in
the amount of water being diverted from the Upper St. Johns River Hydrologic
Basin into coastal receiving waters.
2. It is an objective of the District to,
where practical, curtail diversions of water from the Upper St. Johns River
Hydrologic Basin into coastal receiving waters.
(2) Within the Oklawaha River Hydrologic Basin the following criteria are established:
(a) Storm Frequency - For purposes of design
and evaluation of system performance, both the 10-year and the 25-year design
storm frequencies must be met.
(b)
Runoff Volume - For design purposes, those systems utilizing pumped discharges,
the total post-development discharge runoff volumes shall not exceed
pre-development discharge runoff volumes for the four-day period beginning the
third day of the four-day design storm event.
(3) Within the Wekiva River Hydrologic Basin or the Wekiva Recharge Protection Basin, the following standards and criteria are established:
(a) Recharge Standard -
Applicants required to obtain a permit pursuant to chapter 62-330 or 40C-44,
F.A.C., for a surface water management system located within the Wekiva
Recharge Protection Basin shall demonstrate that the system provides for
retention storage of three inches of runoff from all impervious areas proposed
to be constructed on soils defined as Type "A" Soils as defined by the Natural
Resources Conservation Service (NRCS) Soil Survey in the following NRCS
publications: Soil Survey of Lake County Area, Florida (1975); Soil Survey of
Orange County Area, Florida (1989) and Soil Survey of Seminole County Area,
Florida (1990), which are incorporated by reference in paragraph
40C-4.091(3)(a),
F.A.C. For purposes of this rule, areas with Type "A" Soils shall be considered
"Most Effective Recharge Areas." Section 13.8.1 "Environmental Resource Permit
Applicant's Handbook, Volume II: For Use Within the Geographic Limits of the
St. Johns River Water Management District", as incorporated by reference in
subsection 40C-41.043(5),
F.A.C., contains a list of Type "A" soils. The system shall be capable of
infiltrating this storage volume through natural percolation into the
surrounding soils within 72-hours. Off-site areas or regional systems may be
utilized to satisfy this requirement. As an alternative, applicants may
demonstrate that the post-development recharge capacity is equal to or greater
than the pre-development recharge capacity. Pre-development recharge shall be
based upon the land uses in place as of 12-3-06. Applicants may utilize
existing permitted municipal master stormwater systems, in lieu of onsite
retention, to demonstrate that post-development recharge is equal to or greater
than pre-development recharge. Also, applicants may submit additional
geotechnical information to establish whether or not a site contains Type "A"
soils.
(b) Storage Standard -
Within the Wekiva River Hydrologic Basin, a system may not cause a net
reduction in flood storage within the 100-year floodplain of a stream or other
water course which has a drainage area of more than one square mile and which
has a direct hydrologic connection to Little Wekiva River, Wekiva River, or
Black Water Creek.
(c) Standards
for Erosion and Sediment Control and Water Quality - Within the Wekiva River
Hydrologic Basin, a Water Quality Protection Zone shall extend one half mile
from the Wekiva River, Little Wekiva River north of State Road 436, Black Water
Creek, Rock Springs Run, Seminole Creek, and Sulphur Run, and shall also extend
one quarter mile from any wetland abutting an Outstanding Florida Water.
1. An erosion and sediment control plan must
be submitted as part of the permit application for a surface water management
system which:
a. Serves a project which is
located wholly or partially within this zone; or
b. Serves a project with a total land area
equal to or exceeding 120-acres.
2. The applicant proposing such a system must
give reasonable assurance in the erosion and sediment control plan that during
construction or alteration of the system (including revegetation and
stabilization), erosion will be minimized and sediment will be retained
on-site. The plan must be in conformance with the erosion and sediment control
principles set forth in Section 13.8.2, "Environmental Resource Permit
Applicant's Handbook, Volume II: For Use Within the Geographic Limits of the
St. Johns River Water Management District", as incorporated by reference in
subsection 40C-41.043(5),
F.A.C., and must contain the information set forth in Section 13.8.3,
"Environmental Resource Permit Applicant's Handbook, Volume II: For Use Within
the Geographic Limits of the St. Johns River Water Management District, " as
incorporated by reference in subsection
40C-41.043(5),
F.A.C.
3. For a project which will
be located wholly or partially within 100-feet of an Outstanding Florida Water
or within 100 feet of any wetland abutting such a water, an applicant must
provide reasonable assurance that the construction or alteration of the system
will not cause sedimentation within these wetlands or waters and that
filtration of runoff will occur prior to discharge into these wetlands and
waters. It is presumed that this standard will be met if, in addition to
implementation of the plan required in subparagraph 1., any one of the
following criteria is met:
a. A minimum
100-foot width of undisturbed vegetation must be retained landward of the
Outstanding Florida Water or the abutting wetland, whichever is more landward.
During construction or alteration, runoff (including turbid discharges from
dewatering activities) must be allowed to sheetflow across this undisturbed
vegetation as the natural topography allows. Concentrated or channelized runoff
from construction or alteration areas must be dispersed before flowing across
this undisturbed vegetation. Construction or alteration of limited scope
necessary for outfall structures may occur within this area of undisturbed
vegetation.
b. Construction of the
following perimeter controls at all outfall points to the Outstanding Florida
Water or its abutting wetlands must be completed prior to the start of any
construction or alteration of the remainder of the system:
(I) Stormwater discharge facility meeting the
requirements of "Environmental Resource Permit Applicant's Handbook, Volume II:
For Use Within the Geographic Limits of the St. Johns River Water Management
District" as incorporated by reference in paragraph
40C-4.091(1)(a),
and subsection 40C-42.091(1),
F.A.C.
(II) Sedimentation trap or
basin located immediately upstream of the stormwater discharge facility
referred to above; and,
(III)
Spreader swale to reduce the velocity of discharge from the stormwater facility
to non-erosive rates before discharge to wetlands abutting the Outstanding
Florida Water.
These perimeter controls must be maintained routinely and operated throughout construction or alteration of the entire system. A minimum 25-foot width of undisturbed vegetation must be retained landward of the Outstanding Florida Water or the abutting wetland, whichever is more landward. Construction or alteration of limited scope necessary for outfall structures may occur within this area of undisturbed vegetation.
c.
During construction or alteration, no direct discharge to the Outstanding
Florida Water or its abutting wetland may occur during the 10-year 24-hour
storm event or due to discharge from dewatering activities. Any on-site storage
required to satisfy this criteria must be available (recovered) within 14 days
following the rainfall event. A minimum 25-foot width of undisturbed vegetation
must be retained landward of the Outstanding Florida Water or the abutting
wetland, whichever is more landward. Construction or alteration of limited
scope necessary for outfall structures may occur within this area of
undisturbed vegetation.
In determining whether construction or alteration is of "limited scope necessary, " pursuant to any of the three presumptive criteria above, the District shall require that the area of disturbance be minimized and that the length of time between initial disturbance and stabilization of the area also be minimized.
(d) Standard for Limiting Drawdown - Within
the Wekiva River Hydrologic Basin, a Water Quantity Protection Zone shall
extend 300 feet landward of the landward extent of Black Water Swamp and the
wetlands abutting the Wekiva River, Little Wekiva River, Rock Springs Run,
Black Water Creek, Sulphur Run, Seminole Creek, Lake Norris, and Lake Dorr. As
part of providing reasonable assurance that the standard set forth in paragraph
62-330.301(1)(d),
F.A.C., is met, where any part of a system located within this zone will cause
a drawdown, the applicant must provide reasonable assurance that construction,
alteration, operation, or maintenance of the system will not cause ground water
table drawdowns which would adversely affect the functions provided by the
referenced wetlands.
The applicant shall provide an analysis which includes a determination of the magnitude and areal extent of any drawdowns, based on site-specific hydrogeologic data collected by the applicant, as well as a description of the referenced wetlands, the functions provided by these wetlands, and the predicted impacts to these functions.
It is presumed that the part of this standard regarding drawdown effects will be met if the following criteria is met:
A ground water table drawdown must not occur within the Water Quantity Protection Zone.
(e) Standard for Riparian Wildlife Habitat
Within the Wekiva River Hydrologic Basin.
1.
The applicant must provide reasonable assurance that the construction or
alteration of a system will not adversely affect the abundance, food sources,
or habitat (including its use to satisfy nesting, breeding and resting needs)
of aquatic or wetland dependent species provided by the following designated
Riparian Habitat Protection Zone:
a. The
wetlands abutting the Wekiva River, Little Wekiva River downstream of Maitland
Boulevard, Rock Springs Run, Black Water Creek, Sulphur Run, or Seminole
Creek;
b. The uplands which are
within 50-feet landward of the landward extent of the wetlands above.
c. The uplands which are within 550-feet
landward of the stream's edge as defined, for the purpose of this subsection,
as the waterward extent of the forested wetlands abutting the Wekiva River,
Little Wekiva River downstream of the northernmost crossing of the Little
Wekiva River with S.R. 434, Rock Springs Run, Black Water Creek, Sulphur Run or
Seminole Creek. In the absence of forested wetlands abutting these streams, the
stream's edge shall be defined, for the purpose of this subsection, as the mean
annual surface water elevation of the stream; however, if hydrologic records
are unavailable, the landward extent of the herbaceous emergent wetland
vegetation growing in these streams shall be considered to be the stream's
edge.
2. Any of the
following activities within the Riparian Habitat Protection Zone is presumed to
adversely affect the abundance, food sources, or habitat of aquatic or wetland
dependent species provided by the zone: construction of buildings, golf
courses, impoundments, roads, canals, ditches, swales, and any land clearing
which results in the creation of any system. (Activities not listed above do
not receive a presumption of no adverse effect.)
3. The presumption in subparagraph 2. shall
not apply to any activity which promotes a more endemic state, where the land
in the zone has been changed by man. An example of such an activity would be
construction undertaken to return lands managed for agriculture or silviculture
to a vegetative community that is more compatible with the endemic land
cover.
(4) Local Government Notification for Wekiva River Protection Area - The District shall not issue a conceptual approval or individual, permit for a proposed surface water management system located wholly or partially within the Wekiva River Protection Area, as defined in section 369.303(9), F.S., until the appropriate local government has provided written notification that the proposed activity is consistent with the local comprehensive plan and is in compliance with any land development regulation in effect in the area where the development will take place. The applicant proposing such a system must submit to the District form no. 40C-41.063(4), entitled "Local Government Notification" (10-1-13), after it has been completed and executed by the local government. This form is hereby incorporated by reference and is available at [http://www.flrules.org/Gateway/reference.asp?No=Ref-02657] and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, Florida 32177-2529. Permit applications for systems within the Wekiva River Protection Area shall be processed by the District staff pursuant to the time frames established in section 120.60, F.S., and any District rule regarding permit processing, except that any agency action to approve or approve with conditions shall not occur until the Local Government Notification has been received by the District.
(5) Within the Econlockhatchee River Hydrologic Basin the following standards and criteria are established:
(a) Design Storm Criteria. A system must meet
the peak discharge requirement for the following 24-hour duration design storm
events:
1. Mean annual storm (2.3 year return
period).
2. 25-year return period.
System outlet control structures can be designed to meet the control peak
discharge rates for both design storms by use of a two-stage weir, v-notch
weir, multiple orifices, or other similar structures.
(b) Floodplain Storage Criteria. A system may
not cause a net reduction in flood storage within the 100-year floodplain of
the Econlockhatchee River or any of its tributaries, at a location with an
upstream drainage area of 1 square mile or greater, except for structures
elevated on pilings or traversing works that comply with the conveyance
requirements in subsection 3.3.2, "Environmental Resource Permit Applicant's
Handbook, Volume II: For Use Within the Geographic Limits of the St. Johns
River Water Management District", as incorporated by reference in paragraph
40C-4.091(1)(a),
F.A.C.
(c) Riparian Wildlife
Habitat Standard.
1. The applicant must
provide reasonable assurance that the construction, alteration, operation,
maintenance, removal or abandonment of a system within the following designated
Riparian Habitat Protection Zone will not adversely affect the abundance,
diversity, food sources or habitat (including its use to satisfy nesting,
breeding and resting needs) of aquatic or wetland dependent species:
a. The wetlands contiguous with the
Econlockhatchee River and the following tributaries: Little Econlockhatchee
River north of University Boulevard, Mills Creek, Silcox Branch (branch of
Mills Creek), Mills Branch (branch of Mills Creek), Long Branch, Hart Branch,
Cowpen Branch, Green Branch, Turkey Creek, Little Creek, and Fourmile
Creek;
b. The uplands which are
within 50-feet landward of the landward extent of the wetlands above;
and
c. The uplands which are within
550-feet landward of the stream's edge as defined, for the purpose of this
subsection, as the waterward extent of the forested wetlands abutting the
Econlockhatchee River and the above named tributaries. In the absence of
forested wetlands abutting these streams, the stream's edge shall be defined,
for the purpose of this subsection, as the mean annual surface water elevation
of the stream; however, if hydrologic records are unavailable, the landward
extent of the herbaceous emergent wetland vegetation growing in these streams
shall be considered to be the stream's edge.
d. The following portions of streams
typically lack a defined water's edge, and subparagraph c. shall not apply:
(I) Mills Creek upstream of the intersection
of the creek with the Fort Christmas Road in Section 2, Township 22 South,
Range 32 East;
(II) Long Branch
upstream of the intersections of the creek with SR 520;
(III) Hart Branch upstream of the
intersection of the creek and the Old Railroad Grade in Section 18, Township 23
South, Range 32 East;
(IV) Cowpen
Branch upstream of the southernmost bifurcation of the creek in Section 20,
Township 23 South, Range 32 East;
(V) Green Branch upstream of the intersection
of the creek with the north-south section line between Section 29 and 30,
Township 23 South, Range 32 East;
(VI) Turkey Creek including Turkey Creek Bay
upstream of the intersection of the creek with the Weewahootee Road in Section
5, Township 24 South, Range 32 East;
(VII) Little Creek upstream of the
intersection of the creek with the north-south section line between Sections 22
and 23, Township 24 South, Range 32 East;
(VIII) Fourmile Creek including Bee Tree
Swamp upstream of a point along the creek exactly halfway between section lines
at the south end of Section 21 and the north end of Section 33 within Section
28, Township 24 South, Range 32 East; and,
(IX) All of the Econlockhatchee River Swamp
(a portion of the Econlockhatchee River).
2. Any of the following activities within the
Riparian Habitat Protection Zone are presumed to adversely affect the
abundance, food sources, or habitat of aquatic or wetland dependent species
provided by the zone: construction of buildings, golf courses, impoundments,
roads, canals, ditches, swales, and any land clearing which results in the
creation of any system. (activities not listed above do not receive a
presumption of no adverse effect.)
3. The presumption in subparagraph 2. shall
not apply to any activity which promotes a more endemic state, where the land
in the zone has been changed by man. An example of such an activity would be
construction undertaken to return lands managed for agriculture or silviculture
to a vegetative community that is more compatible with the endemic land
cover.
4. Applicants seeking to
develop within the Riparian Habitat Protection Zone shall be given the
opportunity to demonstrate that the particular development for which permitting
is being sought will not have an adverse effect on the functions provided by
the zone to aquatic or wetland dependent species. The functions provided by the
zone are dependent on many factors. When assessing the value of the zone to
aquatic and wetland dependent species, factors which the District will consider
include: vegetative land cover, hydrologic regime, topography, soils, and land
uses, existing within and adjacent to the zone; and range, habitat, and food
source needs of aquatic and wetland dependent species, as well as sightings,
tracks, or other such empirical evidence of use.
5. The standard of subparagraph
40C-41.063(5)(c)
1., F.A.C., may be met by demonstrating that the overall merits of the proposed
plan of development, including the preservation, creation or enhancement of
viable wildlife habitat, provide a degree of resource protection to these types
of fish and wildlife which offsets adverse effects that the system may have on
the abundance, diversity, food sources, or habitat of aquatic or wetland
dependent species provided by the zone. Mitigation plans will be considered on
a case-by-case basis upon detailed site specific analyses. The goal of this
analysis shall be the determination of the value of the proposed mitigation
plan to aquatic and wetland dependent species with particular attention to
threatened or endangered species. Mitigation plans should include: the
information set forth in subsection 10.3.3, "Environmental Resource Permit
Applicant's Handbook, Volume I (General and Environmental)", implemented
pursuant to paragraph
373.4131(2)(a),
F.S. (2012), for the uplands and wetlands within the zone and within other
areas to be preserved, created or enhanced as mitigation for impacts within the
zone; as well as other pertinent information, including land use, and the
proximity of the site to publicly owned land dedicated to conservation.
Implementation of this paragraph contemplates that the proximity of development
to the river and tributaries named herein and activities permitted in the zone
may vary from place to place in support of a functional resource protection
plan. Furthermore, some reasonable use of the land within the protection zone
can be allowed under paragraph
40C-41.063(5)(c),
F.A.C.
6. Roads or other traversing
works which cross the zone have the potential to fragment the zone and
adversely affect the habitat value of the zone to aquatic and wetland dependent
species. To minimize adverse effects to the zone, applicants for permits to
construct traversing works in the zone must first demonstrate the need for the
traversing works to provide for regional transportation, regional utility
services, or reasonable property access, in addition to meeting the requirement
of subparagraph 40C-41.063(5)(c)
1., F.A.C., above. Traversing works must also be designed to meet all
requirements of the district rules related to water quality and quantity.
Permittees responsible for traversing works shall be required to be responsible
for maintaining the traversing works clean and free from trash and debris to
the greatest extent practical.
(6) Within the Tomoka River Hydrologic Basin or the Spruce Creek Hydrologic Basin the following standards and criteria are established:
(a) Recharge Standard. For
projects or portions of projects within the Most Effective Recharge Area, three
inches of runoff from the directly connected impervious areas in the Most
Effective Recharge Areas, as defined in subsection 13.5.1, "Environmental
Resource Permit Applicant's Handbook, Volume II: For Use Within the Geographic
Limits of the St. Johns River Water Management District, " as incorporated by
reference in subsection
40C-41.043(5),
F.A.C., must be retained within the Most Effective Recharge Area. As an
alternative, applicants may demonstrate that the post-development recharge
capacity is equal to or greater than the pre-development recharge
capacity.
(b) Floodplain Storage
Criteria. A system may not cause a net reduction in flood storage within the
100-year floodplain of the Tomoka River, Spruce Creek, or any of their
tributaries except for structures elevated on pilings or traversing works that
comply with conveyance requirements in subsection 3.3.2, "Environmental
Resource Permit Applicant's Handbook, Volume II: For Use Within the Geographic
Limits of the St. Johns River Water Management District" as incorporated by
reference in paragraph
40C-4.091(1)(a),
F.A.C.
(c) Stormwater Management
Standard. Construction of new stormwater management systems must be in
accordance with the design and performance standards of "Environmental Resource
Permit Applicant's Handbook, Volume II: For Use Within the Geographic Limits of
the St. Johns River Water Management District" as incorporated by reference in
paragraph 40C-4.091(1)(a),
F.A.C. However, systems which serve drainage areas in excess of 10-acres cannot
use detention with filtration treatment as the sole stormwater treatment
methodology. Additionally, when retention systems are not feasible due to
limited percolation capacity, wet detention treatment or other treatment
demonstrated to be equivalent to retention or wet detention, in accordance with
"Environmental Resource Applicant's Handbook, Volume II: For Use Within the
Geographic Limits of the St. Johns River Water Management District" as
incorporated by reference in paragraph
40C-4.091(1)(a),
F.A.C., must be used.
(d) Riparian
Wildlife Habitat Standard.
1. The applicant
must provide reasonable assurance that the construction, alteration, operation,
maintenance, removal or abandonment of a system within the following designated
Riparian Habitat Protection Zone will not adversely affect the abundance,
diversity, food sources or habitat (including its use to satisfy nesting,
breeding and resting needs) of aquatic or wetland dependent species:
a. The wetlands and uplands which are within
50-feet landward of the landward extent of the wetlands which abut Spruce Creek
north of Pioneer Trail to the FEC railroad, and the Tomoka River north of I-4
to US 1 and the following tributaries:
(I)
Spruce Creek east of the western section line of Section 35, Township 16 South,
Range 32 East, Volusia County, Florida;
(II) Spruce Creek east of the power line
easement in Section 27, Township 16 South, Range 32 East, Volusia County,
Florida;
(III) Spruce Creek west of
SR 415 and south of the northern section line of Section 23, Township 16 South,
Range 32 East, Volusia County, Florida;
(IV) The Little Tomoka River north of SR 40
and south of the western section line of Section 22, Range 31 East, Township 14
South, Flagler County;
(V) Priest
Branch east of the power line easement in Section 6, Township 15 South, Range
32 East, Volusia County, Florida; and,
b. The uplands which are within 550-feet
landward of the stream's edge of the following portions of the streams. The
stream's edge is defined, for the purpose of this subsection, as the waterward
extent of the wetlands abutting the stream:
(I) Spruce Creek north of the southern
section line of Section 25, Range 32 East, Township 16 South, Volusia County,
Florida;
(II) Tomoka River north of
the confluence of the Tomoka River and Priest Branch; and,
c. The uplands which are within 320-feet
landward of the stream's edge of the following portions of the streams. The
stream's edge is defined, for the purpose of this subsection, as the waterward
extent of the wetlands abutting the stream:
Spruce Creek east of I-95 and west of the FEC railroad; and,
d. The uplands that are
within 275-feet landward of the edge of the following streams:
(I) Spruce Creek south of the southern
section line of Section 25, Range 32 East, Township 16 South, Volusia County,
Florida
(II) Spruce Creek east of
the western section line of Section 35, Township 16 South, Range 32 East,
Volusia County, Florida;
(III)
Spruce Creek east of the power line easement in Section 27, Township 16 South,
Range 32 East, Volusia County, Florida;
(IV) Spruce Creek west of SR 415 and south of
the northern section line of Section 23, Township 16 South, Range 32 East,
Volusia County, Florida;
(V) The
Tomoka River south of the confluence of the Tomoka River and Priest Branch in
Section 36, Range 31 East, Township 14 South, Volusia County,
Florida;
(VI) The Little Tomoka
River north of SR 40 and south of the western section line of Section 22, Range
31 East, Township 14 South, Flagler County, Florida; and,
(VII) Priest Branch east of the power line
easement in Section 6, Township 15 South, Range 32 East, Volusia County,
Florida.
2. Any
of the following activities within the Riparian Habitat Protection Zone are
presumed to adversely affect the abundance, food sources, or habitat of aquatic
or wetland dependent species provided by the Zone: construction of buildings,
golf courses, impoundments, roads, canals, ditches, swales, and any land
clearing which results in the creation of any system. (Activities not listed
above do not receive a presumption of no adverse effect.)
3. The presumption in subparagraph 2. shall
not apply to any activity which promotes a more endemic state, where the land
in the Zone has been changed by man. An example of such an activity would be
construction undertaken to return lands managed for agriculture or silviculture
to a vegetative community that is more compatible with the endemic land
cover.
4. The standard of
subparagraph 1. may be met by demonstrating that the overall merits of the
proposed plan of development, including mitigation as described in section
10.0, "Environmental Resource Permit Applicant's Handbook, Volume I (General
and Environmental)", implemented pursuant to Section
373.4131(2)(a),
F.S. (2012), provide a degree of resource protection to these types of fish and
wildlife which offsets adverse effects of the proposed system on the uplands
and wetlands within the Zone. Some reasonable use of the land within the
Protection Zone can be allowed under this section.
5. Roads or other traversing works which
cross the Zone have the potential to fragment the Zone and adversely affect the
habitat value of the Zone to aquatic and wetland dependent species. To minimize
adverse effects to the Zone, applicants for permits to construct traversing
works in the Zone must first demonstrate the need for the traversing works to
provide for regional transportation, regional utility services, or reasonable
property access, in addition to meeting the requirement of subparagraph 1.,
above. Traversing works must also be designed to meet all requirements of the
district rules related to water quality and
quantity.
(7) Within the Sensitive Karst Areas Basin, stormwater management systems shall be designed to assure adequate treatment (pursuant to Sections 13.6 through 13.6.3, "Environmental Resource Permit Applicant's Handbook, Volume II: For Use Within the Geographic Limits of the St. Johns River Water Management District" as incorporated by reference in subsection 40C-41.043(5), F.A.C.) of the stormwater before it enters the Floridan Aquifer, and to preclude the formation of solution pipe sinkholes in the stormwater system. Many different stormwater management system designs will achieve these goals, therefore the District does not require any specific system design. However, to assure protection of the Floridan Aquifer, the District does require certain design features. The individual site characteristics may affect what design features will be required. However, for all projects in sensitive karst areas, the following minimum design features are required:
(a) A minimum of three feet of unconsolidated
soil material between the surface of the limestone bedrock and the bottom and
sides of the stormwater basin. Excavation and backfill of suitable material may
be made to meet this criteria;
(b)
Stormwater basin depth should be as shallow as possible with a horizontal
bottom (no deep spots);
(c) Maximum
stormwater basin depth of 10-feet; and,
(d) Fully vegetated basin side slopes and
bottoms. The District recommends that Saint Augustine or Bermuda grass be used
for this purpose.
(e) The above
requirements represent the minimum requirements for stormwater management
system design in sensitive karst areas. However, depending on the potential for
contamination to the Floridan Aquifer, more stringent requirements may apply
for certain projects (e.g., industrial and some commercial sites). Examples for
more stringent design features include:
1.
More than three feet of material between the limestone bedrock surface and the
bottom and sides of the stormwater basin;
2. Basin liners - clay or
geotextile;
3. Sediment sumps at
stormwater inlets;
4. Off-line
treatment;
5. Special stormwater
system design;
6. Ground water
monitoring, and
7. Paint/solvent
and water separators.
(8) Any surface water management system that requires a permit pursuant to chapters 62-330 or 40C-44, F.A.C., and that will be located within the Lake Apopka Hydrologic Basin or will discharge water to Lake Apopka or its tributaries, must comply with the requirements of Section 13.7, "Environmental Resource Permit Applicant's Handbook, Volume II: For Use Within the Geographic Limits of the St. Johns River Water Management District" as incorporated by reference in subsection 40C-41.043(5), F.A.C.
Rulemaking Authority 369.318, 373.044, 373.113, 373.413 1, 373.414, 373.415, 373.418 FS. Law Implemented 369.318, 373.413, 373.4131, 373.414, 373.415, 373.416, 373.418, 373.426, 373.461 FS.
New 12-7-83, Amended 5-17-87, 8-30-88, 4-3-91, 9-25-91, 7-14-92, 10-3-95, 11-25-98, 10-11-01, 3-7-03, 2-10-05, 12-3-06, 10-1-13, 6-1-18.
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