HomeMy WebLinkAboutORD 2008-12 - Conservation Subdivisions UDCI► 1 W1
An Ordinance of the City Council of the City of Georgetown, Texas,
creating Section 11.06 ("Conservation Subdivisions") of the Unified
Development Code, Passed and Adopted on the 11th Day of March
2003, Repealing Conflicting Ordinances and Resolutions; Including a
Severability Clause; and Establishing an Effective Date.
Whereas, the City Council of the City of Georgetown ("City Council") conducted
a workshop on January 12, 2005 with noted land planner Randall Arendt to learn about
Conservation Subdivision Design and understand its possibilities as a planning tool for
Georgetown; and
Whereas, on May 24, 2005 the City Council directed the City staff to develop a
Conservation Subdivision Ordinance as a part of the City's Unified Development Code;
and
Whereas, on September 12, 2006 the City Council adopted resolution 091206-U
which established a requirement for Conservation Subdivision Design in the South San
Gabriel River basin; and
Whereas, according to the United States Environmental Protection Agency
publication 231-R-06-001 the following strategies are recommended for maximum
protection of water resources: preservation of large, continuous areas of absorbent open
space, preservation of critical ecological areas, such as wetlands, floodplains, and
riparian corridors, and minimizing overall land disturbance and impervious surface
associated with development; and
Whereas, according to the United States Environmental Protection Agency
publication 231-R-06-001 reducing overall imperviousness within a watershed by
preserving large, continuous areas of open space and clustering development at higher
densities reduces the total amount of stormwater runoff within the watershed and
increases the overall health of the watershed; and
Whereas, conserved open space in conservation subdivisions will allow for the
creation of a network of linked open spaces and parkland and provide corridors for
wildlife movement; and
Whereas, from June 2007 to February 2008, the City staff conducted a series of
meetings with local real estate developers, home builders, planners, engineers and other
stakeholders to refine the Conservation Subdivision Ordinance provisions for
implementation within the city limits and ETJ; and
oKo. a0090 t
Conservation Subdivision Ordinance
Page 1 of 14
Whereas, pursuant to Article 11, Section 5 of the Constitution of the State of
Texas the City has the authority to adopt ordinances not inconsistent with the laws of
the State of Texas; and
Whereas, pursuant to Section 212.002 of the Texas Local Government Code the
City has the authority to adopt rules governing plats and subdivision of land within the
City's jurisdiction to promote the health, safety, morals, or general welfare of the City
and the safe, orderly and healthful development of the City; and
Whereas, pursuant to Section 401.002 of the Texas Local Government Code the
City has the authority to adopt rules prohibiting the degradation of a stream, recharge
feature, recharge area, or tributary that may constitute or recharge the source of water
supply of the City and may provide for the protection of and may police any
watersheds; and
Whereas, policy three of the Century Plan Development Plan states that the City
will take the steps necessary to protect the physical attributes that make Georgetown
attractive and establishes high priority to adopt new ordinances consistent with the
protection of the Edwards Aquifer.
Whereas, the City Council finds that it is necessary for the protection of
watersheds, wildlife habitat, open space networks and the protection of other natural
and historic resources to adopt a Conservation Subdivision Ordinance.
TTOTTI ! s
GEORGETOWN,THAT:
SECTION 1. The facts and recitations contained in the preamble of this
ordinance are hereby found and declared to be true and correct, and are incorporated by
reference herein and expressly made a part hereof, as if copied verbatim. The City
Council hereby finds that this ordinance implements the Century Plan as follows:
Policy 1.0:
The community
enjoys
the
benefits of well-planned land use in
which conflicting
needs
are
balanced.
Goal: Develop policies which enhance the quality of life for the
community while preserving the unique character and natural
resources.
Str_ &t gy: Implement the Unified Development Code (UDC) to ensure
consistency of the City's development ordinances to preserve the
character of the community.
OPJD. 0 e 1;-.
Conservation Subdivision Ordinance
Page 2 of 14
SECTION 2. The City Council hereby finds that this
implement the Goals of the Future Land Use Plan as follows:
ordinance seeks
Goal 1: Encourage the most desirable and efficient use of land while
enhancing the physical environment through functional and
compatible land use configurations.
Objective 1.2: Plan for future development that is compatible with the City's
natural features, environmentally sensitive areas, and existing
land uses.
Goal 6: Provide for a variety of housing types throughout the City.
Objective 6.8 Where possible, encourage clustering of residential units to reduce
development and maintenance cost, preserve natural features and
maximize open space.
Goal 11: Promote respect, conservation, enhancement and protection of
important natural features and resources.
Objective 11.1: Develop guidelines to help conserve and protect environmentally
sensitive, unique areas, including the San Gabriel River, creek
areas and areas affected by the Edwards Aquifer (i.e. recharge
zones); guidelines should include ensuring water infiltration (e.g.,
maximizing permeable surfaces, minimizing paving and building
coverage, etc.) and protection of watershed areas.
Objective 11.4: Maintain high standards for water quality, especially in terms of
the quality of the San Gabriel River.
Objective 11.5: Encourage and promote water conservation through use of native
plant materials, xeriscape techniques, and other methods.
and further finds that the enactment of this ordinance is not inconsistent or in conflict
with any other Century Plan Ends, as required by Section 2.03 of the Administrative
Chapter of the Policy Plan.
SECTION 3. Chapter 11 "Environmental Protection" is hereby amended by
adding a new Section as follows:
ORIDe �I
Conservation Subdivision Ordinance
Page 3 of 14
Section i i i i
This Section is intended to encourage Conservation Subdivisions within the city limits
and the City's ETJ in order to protect natural resources, conserve valuable open space,
reduce erosion and sedimentation, preserve riparian corridors, provide for walking
trails, protect the community water supplies, reduce infrastructure, preserve prime
agricultural land, provide smaller streets with less environmental disturbance and plan
for overall watershed protection. In an effort to achieve these goals, the City is
encouraging developments in areas that are intended for Low-density single-family
residential to be designed'in a manner consistent with the conservation design standards
outlined below.
A. General. The provisions of this Section ii.o6 apply to any property in the city limits
and the ETJ that will be developed as Conservation Subdivisions with centralized
wastewater collection and treatment services (i.e., wastewater service provided by the
City of Georgetown or another qualified regional service provider).
B. Incentives. Properties developing under the provisions of this Section 11.06 will be
eligible for development incentives including increased density, alternative street
standards with less pavement surface and grading, flexible lot standards with shorter
setbacks, increased impervious cover bonuses, connection to organized wastewater
systems, and flexible stormwater design.
C. Properties in ETJ Served by Septic Systems. Property located outside of the
city limits that will not be developed with collectivized wastewater systems are not
eligible for the incentives or provisions associated with this Section z1.o6.
D. Council Consideration of Applicability of Standards. The City staff shall
review a Site Analysis Map (Section x.1.06.020 (A)) for applicable properties and prepare
a report for consideration by the Planning and Zoning Commission and City Council
stating whether the development standards in this Section zs.o6 are recommended for
the property.
E. Limit on Wastewater Service. Property developed under this Section il.o6 may
be allowed to connect to the City's wastewater system, in compliance with the utility
extension policies of this Code and all other applicable City ordinances and policies, for
the level of demand not to exceed that stated in the City's Comprehensive Plan for the
type of Land Use category applicable to the property shown on the City's Future Land
Use Plan.
A. Site Analysis Map Required. The Applicant shall prepare and submit a Site
Analysis Map to the planning staff for review prior to the submittal of an application for
Preliminary Plat or Site Plan, whichever comes first. If the property meets the criterion
set forth is Section li.o6.ol0, the Site Analysis Map must be acted upon by the City
Council prior to submittal of any subsequent application for development. The purpose
of the Site Analysis Map is to ensure that the important site features have been
adequately identified prior to the creation of the site design, the proposed open space
O 008 - i
Conservation Subdivision Ordinance
Page 4 of 14
set-aside will meet the requirements of this section, and whether the site is a candidate
for development using conservation subdivision design principles. The Site Analysis Map
can be prepared by a licensed landscape architect, geologist, professional engineer,
surveyor or other professional, set forth in the Development Manual. The Site Analysis
Map shall include, but not be limited to, the following features, if applicable:
1. Property boundaries;
2. The FEMA Floodplain, additional streams, rivers, lakes, wetlands, and other
hydrologic features;
3. Topographic contours of no less than to -feet intervals;
4. Probability of Karst features;
5. Probability of Endangered or Threatened Species habitat;
6. General vegetation characteristics of the land (trees, understory brush,
groundcover, etc.);
7. Existing roads, structures and utility easements;
8. Historical or archaeological sites;
9. Agricultural land in current or historical farming use;
lo. Potential connections with existing or future green -space and trails.
B. Conservation Open Space Management Plan Required. A Conservation
Open Space Management Plan, as described below, shall be prepared and submitted
concurrently with the Preliminary Plat and be referenced to in a plat note. This
Conservation Open Space Management Plan ("Plan") shall:
1, allocate responsibility and state guidelines for the maintenance, cost and
operation of the Open Space and any facilities located thereon, including
provisions for ongoing maintenance, the source of funding and for long-term
capital improvements;
2. provide for enforcement of the Plan;
3. determine whether or not structures to be built within the plat(s) will be
designated "green design" (as defined in ll.o6.040);
4. provide that any changes to the Plan be reviewed and approved by the City
Council of the City of Georgetown; and
5. include a provision stating that, in the event that the guidelines described in
the Plan have not been met, the City may assume or assign responsibility for
its maintenance and may enter the premises and take corrective action, the
costs of which may be charged to the Owner(s).
C. Instrument of Permanent Protection Required. An instrument of permanent
protection, such as a conservation easement, deed restriction or other permanent
restrictive covenant, as described below, shall be placed on the Open Space prior to the
recordation of the Final Plat. A plat note referencing this instrument shall be included on
the Preliminary and Final Plats. This instrument can be:
1. A permanent conservation easement in favor of:
a. a land trust or similar conservation -oriented non-profit organization with
legal authority to accept such easements. The organization shall be bona
fide and in perpetual existence and the conveyance instruments shall
contain an appropriate provision for retransfer in the event the
organization becomes unable to carry out its functions;
b. a homeowner's association, provided that membership is mandatory; or
c. a governmental entity with an interest in pursuing goals compatible with
the purposes of this ordinance. If the entity accepting the easement is not
. woolt,
Conservation Subdivision Ordinance
Page 5 of 14
the City,
then a
third right
of enforcement favoring the City shall be
included
b.
Meadows, woodlands, wildlife corridors, game preserves, or similar
in the
conservation -oriented areas;
easement;
or
2. Another equivalent legal tool that provides permanent protection, if approved
by the City.
A. Standards to Determine Conservation Open Space. The Conservation Open
Space shall comprise at least thirty-five percent (35%) of the gross tract area, including
parkland dedication, described in Section 13.05. Parkland dedication is permitted and
encouraged to be within or directly adjacent to the Conservation Open Space,
1. The following are considered Primary Conservation Areas and are required to be
included within the Conservation Open Space, unless the Applicant demonstrates
that this provision would constitute an unusual hardship and be counter to the
purposes of this article, as determined by the Director.
a. The regulatory loo -year floodplain, as defined by the City of Georgetown
Drainage Manual;
b. Buffers of at least twenty-five (25) feet on both sides of the floodplain for all
perennial and intermittent streams in a drainage basin of 20 acres and
greater;
c. Wetlands that meet the definition used by the Army Corps of Engineers
pursuant to the Clean grater Act;
d. Karst cave features and buffers;
e. Endangered or Threatened Species habitat; and
f. Archaeological sites, cemeteries and burial grounds;
2. The following are considered Secondary Conservation Areas and may be included
within
the Conservation Open Space, if necessary or desired.
a.
Existing healthy, native forests of at least one acre contiguous area;
b.
Meadows, woodlands, wildlife corridors, game preserves, or similar
conservation -oriented areas;
c.
Other significant natural features and scenic view sheds such as ridge lines,
peaks and rock outcroppings, particularly those that can be seen from public
roads;
d.
Agriculture, horticulture, forestry or pasture uses.
e.
Easements for drainage, access, underground utility lines, etc.;
f.
Other conservation -oriented uses and/or structures compatible with the
purposes of this ordinance;
g.
Walking or bicycle trails, either existing or proposed;
h.
Nonstructural stormwater management practices, addressed in Section
11.o6.050.
3. The Conservation Areas shall be depicted on the Preliminary and Final Plats,
4. Management practices shall be defined by the potential use(s) at the time of
submittal of the Conservation Open Space Management Plan.
B. Restricted Uses of Conservation ®pen Space. The following are prohibited and
restricted uses of the Primary and Secondary Conservation Areas, unless the Applicant
ORD* eZ009 �M
Conservation Subdivision Ordinance
Page 6 of 14
demonstrates that these provisions would constitute an unusual hardship and be counter
to the purposes of this article, as determined by the Director.
1. Prohibited Uses in Conservation Open Space
a. Golf courses;
b. Roads, parking lots and impervious surfaces, unless allowed by another
provision within Section i1.o6 or for the specific use of maintaining street
connectivity;
c. Wastewater disposal, except for irrigation use in public parks or roadways;
and
d. Agricultural activities not conducted according to acceptable Management
Practices.
2. Additional Restrictions on Use of Conservation Open Space
a. At least 50% of the Conservation Open Space shall be in a contiguous tract.
b. The Conservation Open Space should adjoin any neighboring areas of open
space, other protected areas, or non -protected natural areas that could be
candidates for protected open space in the future.
c. A buffer of at least loo feet shall be required between residential structures
and agricultural uses unless that use is a tree farm, community garden,
orchard or other compatible agricultural use, as determined by the Director.
This buffer should consist of trees, native grasses, shrubs and/or a windbreak
and can be included in the designated open space. Roads or other types of
buffers can be substituted if deemed sufficient by the Director.
d. The Conservation Open Space should be directly accessible to the largest
practicable number of lots within the subdivision. Non -adjoining lots shall be
provided with safe, convenient access to the Open Space. See example
diagram below.
e. Tree Survey requirements of Section 11.03.020 will be waived for those areas
defined as Primary Conservation Open Space.
A009m12
Conservation Subdivision Ordinance
Page 7 of 14
0
s 85
.w: 1� # i' • i
A. Maximum Impervious Cover. Impervious cover shall not exceed 50% of gross
property acreage for any use.
1. See Conservation Subdivision Dimensional Standards Table in Section 11.o6.070
for specific lot dimensional standards.
2. All other impervious cover limitations in Section 11.02 shall apply here, except
those stated in Table 11.o6.07o and Table 11.o6.071.
3. Dedicated parkland, trails (public or private), streets classified as collectors and
arterials on the Thoroughfare Plan, or historical/archaeological structures do not
count against the total impervious cover.
B. Green resign Bonus, An impervious cover bonus to 55% gross property acreage
may be received for "green design" if all building construction satisfies minimum
"certified" requirements of U.S. Green Building Council's final adopted LEED guidelines
or NAHB Green Building Guidelines, as certified by the buildings' architect and reviewed
by the City Building Plans Examiner. Applications seeking certification for green design
shall so state. A green design requirement shall be memorialized in a plat note on the
MKIMONOW11119 •• • •
Page 8 of
Preliminary and Final Plats, and shall be a condition in the Conservation Open Space
Management Plan.
1 a. 1. ! • :. ..a -
A. Detention. To the extent possible, detention ponds shall be designed to manage
stormwater within the entire Conservation Subdivision, unless otherwise approved by
the City's Development Engineer.
1. All detention ponds shall be designed as an integral part of the landscape,
including a slope no greater than 3:1, no concrete except at the outlet and/or the
inlet, and no requirement for or installation of barrier fencing. All detention
ponds shall be designed to have minimal amount of land disturbance (based on
commercially reasonable standards) as a part of its construction. All ponds shall
meet all requirements of the City Drainage Manual.
2. If barrier fencing is required, such fencing shall be wrought iron or other
decorative fencing and shall be buffered from the street view by planting shrubs
and vines that will, at maturity, screen at least sixty percent (6o%) of the view of
the fence.
B. Water Quality. To the extent possible, water quality ponds shall be designed to
manage stormwater within the entire Conservation Subdivision, unless otherwise
approved by the City's Development Engineer. All water quality ponds will be designed
according to current Texas Commission on Environmental Quality (TCEQ) Standards for
a Permanent Best Management Practice.
1. Water quality shall be provided by one or more of the following methods.
a. Extended detention basins (only when associated with a wet basin or pond);
b. Grassy swales;
c. Vegetative filter strips;
d. Aqualogic cartridge systems;
e. Wet basins;
f. Constructed wetlands; or
g. Bioretention.
2. All water quality facilities shall be designed as an integral part of the landscape,
I
ncluding a slope no greater than 3:1, no concrete except at the outlet and/or the
inlet, and no requirement for or installation of barrier fencing. All water quality
facilities shall be designed to have minimal amount of land disturbance (based on
commercially reasonable standards) as a part of its construction.
3. If barrier fencing is required, such fencing shall be wrought iron or other
decorative fencing and shall be buffered from the street view by planting shrubs
and vines that will, at maturity, screen at least sixty percent (6o%) of the view of
the fence.
Streets within conservation subdivisions may be constructed to alternate standards than
those required in Chapter 12. The neighborhood street network shall form an organized,
connected pattern that defines the community both functionally and visibly. Streets
shall take the form of two-way streets, two one-way streets separated by a landscaped
median, or a residential lane and shall be designed to respect and follow the existing
o �
Conservation Subdivision Ordinance
Page 9 of 14
terrain and natural contours. Streets should, when possible, parallel existing tree lines,
minimize construction and grading costs, promote pedestrian movement and minimize
crossing of primary conservation areas. Maximum grading can be increased to 12% on
local streets, where applicable. In addition, streets should be shorter and narrower than
traditional streets to lessen impervious cover and combine gentle curves and grade
changes With traffic calming measures for safety purposes. See the Table of standards
below.
Criteria
Alley
Residential
lane Loo
Locai
Res.
Collector*
Major
Collector +
Minor
Arterial
Major
Arterial
Expected ADT
<800
<800
>800
>2,500
>12500
>24000
Right -of -Way
(minimum feet)
20
50
50
70
u2
136
160
Pavement Widths (f)
15
20
26 feet
33**
44
48
48-72
Traffic Lanes
1
2
1 shared lane
2
2-4
2-4
4-6
Lane Width
15 ft
10 feet
10 feet
10 feet
11 feet
12 feet
12 feet
Parking Lanes
None
None
Both sides
Both sides
Both sides***
None
None
Design Speed
--
20-25
20-25
20-25
30-35
35-40
35-40
Median Width****
--
--
--
10 feet
16 feet
24 feet
24 feet
Edge Landscaping
(both sides (in row))
--
'-
--
6 feet
12 feet
12 feet
Sidewalk/Trail
None
Both Sides
Both Sides
Both Sides
Both Sides
Both Sides
Both Sides
Sidewalk Width
--
5 feet
5 feet
5 feet
8 foot trail*****
8 foot trail
8 foot trail
Landscape Easement
(min. 1o' wwidth)
None
Both Sides
Both Sides
Both Sides
Both Sides
Both Sides
Both Sides
Residential• r required to have a 15x6 foot bulb-outparking
•:
without parking lanes if homes do not front onto it. R.O.W. for these streets would rema
at 6
Parking required for2-lane roadways only
Edge landscaping and 8' trails can be interchangeable and meanderimr according
topography, existing vegetation, slope or desired path.
***** 8 foot trails will be built to hikeibike standards in place of 5 foot sidewalks standar
al can carry both #! pedestrian
ORDO �
Conservation Subdivision Ordinance
Page 10 of 14
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Conservation Subdivision Ordinance
Page 11 of 14
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C) 4 "
Conservation Subdivision Ordinance
Page 12 of 14
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CfliiY
Zero -Lot
2-
"rEi ::
CZ112
�
Lot/Parcel Area, nein.
I acre
10000
4000
4,500
5000
!T
10000
L.3K'SC3
L.:IIf, -YL Sim_yl
--
--
f.IEB'.4\
--
2500
2000
^�trt
1000
Ii�Cj :iJLE SM1'.
t^' 7?'
8'
`0 3E` WIN ;E.0 P to EO G.i
>;
36 MOL
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P.0 P.?
24
Lot width, minimum feet *
6o
50
40
40
50
22
45
40
Front Setback, min. feet
25
15
10
15
10
10
15
15
Side Setback, min. feet
10
10
6
o/6
6
1 6
10
20
Rear Setback, min. feet
20
10
10
7.5
10
10
10
20
Fm eraious Coverage (zoning, max %)
25
55
55
65
55
65
65
65
Building Height, max. Feet
35
35
35
40
35
40
40
6o
Ace. Building Height, max. feet
45
15
15
25
15
15
15
15
Required Landscaping, min. %
see chapter 8
Perimeter Buffer, min. feet
I
1
11
2 (
12 (
12
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11111 11111 IFNI 1111111 111111 111 111 11 111111 ... 11, pil 1111,111 111 1111111
Conservation Lot Development Standards establish lot sizes and certain restrictions for
all residential and non-residential conservation development within the City of
Georgetown. The tables below replace tables 6.02.03o and 6.03.020 in Chapter 6. All
other language and sections of Chapter 6 apply here. All properties must comply with
the Impervious Cover Limitations established in Section 11.02, except those stated in the
Table below.
Standard
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Apt*lineF&ill
Lot/Parcel Area, nein.
I acre
10000
4000
4,500
5000
12000
10000
1 12000
Area per Dwelling, min.
--
--
-
--
2500
2000
2500
1000
Units per Structure, max.
--
--
--
--
2
6
4
24
Lot width, minimum feet *
6o
50
40
40
50
22
45
40
Front Setback, min. feet
25
15
10
15
10
10
15
15
Side Setback, min. feet
10
10
6
o/6
6
1 6
10
20
Rear Setback, min. feet
20
10
10
7.5
10
10
10
20
Fm eraious Coverage (zoning, max %)
25
55
55
65
55
65
65
65
Building Height, max. Feet
35
35
35
40
35
40
40
6o
Ace. Building Height, max. feet
45
15
15
25
15
15
15
15
Required Landscaping, min. %
see chapter 8
Perimeter Buffer, min. feet
*Minimum lot widths on cul-de-sac lots may be reduced between 25 feet and 50 feet at the front property line
provided that the minimum required lot width is provided at the front setback line.
**Side setbacks may be reduced to less than 6 feet, subject to required minimum fire flow.
Conservation Subdivision Ordinance
Page 13 of 14
Standard
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OF
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MT
IN 'i
Lot Area, minimum
i0000 SF
--
--
--
5 acres
--
Lot Width, minimum feet
50
--
--
--
--
-
Front Setback, min. feet
20
--
25
25
50
35
Required Front Build -to Line
15%
15%
--
15%
--
--
Side Setback, min. feet
10
4
10
10
20
n/a
20
Rear Setback, min. feet
20
0
10
10
20
20'
Im envious Coverage, max % }
65
8o
8o
85
70
95
Building Height, max. feet
25
35
45
45
6o
6o
Required Landscaping, min. %
15
15
15
20
35
15
Perimeter Buffer, min, feet
10
0
25
15
20
30
SECTION 4. Definitions related to this ordinance, attached as Exhibit A, are to be
inserted into Chapter 16 of the Unified Development Code.
SECTION 5. This Ordinance shall become effective immediately upon its final
adoption.
PASSED AND APPROVED on First Reading on the 26tn day of February
PASSED AND APPROVED on Second Reading on the 11tt, day of March, 2008.
ATTEST:
Sandra D. Lee
City Secretary
Approved as to Form:
THE CITY OF GEORGETOWN
Garyv elon, Mayor
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Patricia E. Carls, Carls, McDonald and Dalrymple
City Attorney
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Conservation Subdivision Ordinance
Page 14 of 14
Exhibit A
l _ s
Best Management Practices - schedules of activities, maintenance
procedures, and other management practices to prevent or reduce the
pollution of water in the state from point and non -point sources, to the
maximum extent practicable. Best management practices also include
treatment requirements, operating procedures, and practices to control plant
site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw
material storage.
Conservation Development - development that groups new structures
onto a portion of the development parcel, so that the remainder can be
preserved as unbuilt open space.
Conservation Easement - a legal agreement a property owner makes to
restrict the type and amount of development that may take place on his or
her property. The easement spells out the rights the landowner retains and
the restrictions on use of the property. Each of these rights and restrictions is
negotiated between the landowner and the conservation organization holding
the easement.
Conservation Open Space - open space within a conservation subdivision
is the portion of the conservation subdivision that has been set aside for
permanent protection.
Endangered or Threatened Species - refers to species that are "in danger
of extinction within the foreseeable future throughout all or a significant
portion of its range," while threatened refers to "those animals and plants
likely to become endangered within the foreseeable future throughout all or a
significant portion of their ranges," as defined in the Endangered Species Act
of 1073.
Hardship - privation; suffering; state of misfortune or affliction.
Intermittent Stream - a stream that has a period of zero flow for at least
one week during most years. Where flow records are available, a stream with
a flow of less than 0.1 ft3/s is considered intermittent.
Karst - a type of topography that is formed over limestone, dolomite or
gypsum by solution of the rock and is characterized by closed depressions or
sinkholes, caves and underground drainage.
Natural Vegetative Buffer - an area of either natural or native vegetation
that buffers a water body from terrestrial runoff and the activities of humans.
In natural areas, it may be much greater than the riparian zone width. In
human -altered settings, the natural vegetative buffer limit would be at the
point of human influence in the riparian zone such as a road, parking lot,
Exhibit A
pasture, or field of crops. It is the width of this buffer that we are most
interested in measuring for purposes of quantifying potential stream
impairments.
onstructural Stormwater Management Practice. Any natural or planted
vegetation other nonstructural component of the stormwater management
plan that provides enhances stormwater quantity and/or quality control or
other stormwater management benefits, and includes, but is not limited to,
riparian buffers, open and green space overland flow filtration areas, natural
depression, and vegetated channels.
Primary Conservation Areas - Open space areas that contain features
which are required to be part of the conservation open space, such as
wetlands, endangered species habitat, etc.
Riparian Zone - generally includes the area of the stream bank and out
onto the flood plain that is periodically inundated by the flood waters from
the stream. The limit of the zone depends on many factors including native
plant community make up, soil moisture levels, and distance from the stream
(or the limit of interaction between land and stream processes). It is
periodically inundated by the flood waters from the stream. Interaction
between this terrestrial zone and the stream is vital for the health of the
stream.
Secondary Conservation Areas - Open space areas that contain features
which are encouraged but optional for inclusion into the conservation space.
Septic System - A septic system is used to dispose of human sanitary waste
or effluent from dwellings, businesses, community centers or other places
where people congregate. They include a septic tank and a subsurface fluid
distribution system. The UIC requirements do not apply to single family
residential septic systems nor to non-residential septic systems which are
used solely for the disposal of sanity waste and have the capacity to serve
fewer than 20 people a day.
Wetland - those areas that are inundated or saturated by surface or ground
water at a frequency and duration sufficient to support, and that under
normal circumstances do support, a prevalence of vegetation typically
adapted for life in saturated soil conditions.