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Sample Ordinance Language for Conservation Subdivisions

1.0 Purpose

In addition to the general goals listed in the statements of Purpose, and Community Development Objectives in Article I of this Ordinance, the purpose of this article is to:

This section of the ordinance outlines the purposes of allowing conservation subdivisions as a development option. Ideally, this section should also refer to the goals of the municipal comprehensive plan and open space plan to provide additional policy support for the implementation of the conservation subdivision provisions and treatment of the required open space.

1.1 Conserve open land, including those areas containing unique and sensitive natural resources such as woodlands, steep slopes, streams, floodplains, riparian buffers, and wetlands, by setting them aside from development.

1.2 Provide greater design flexibility and efficiency in the siting of services and infrastructure, including the opportunity to reduce the length of roads, utilities, and the amount of paving and impervious surface required for residential development.

1.3 Reduce erosion and sedimentation through the retention of existing vegetation, the minimization of development on steep slopes, and the reduction of earth disturbance.

1.4 Implement the policies of the Township's Comprehensive Plan and Open Space, Recreation, and Environmental Resources Plan to protect environmentally sensitive areas, address recreation, trails, and open space needs, and to preserve the municipality's scenic and rural character.

1.5 Provide for a diversity of lot sizes, building densities, and housing choices; and to accommodate a variety of age and income groups and residential preferences, so that the municipality's population diversity may be maintained.

1.6 To provide development options for landowners which minimize impacts on sensitive environmental resources, reduce disturbance of natural and cultural features, and conserve scenic views.


Qualifying conditions specify the zoning districts in which the conservation subdivision is permitted and the minimum tract size required to use the option. The minimum tract should not be exceedingly large. A successful conservation subdivision can occur on a tract as small as ten acres. Allowing conservation subdivisions on smaller tracts may be particularly useful when the tract is located adjacent to another development with preserved open space. In some municipalities no minimum tract size is required. A site area of greater than 10 acres might be considered for the Village Design Option.

2.0 Qualifying Conditions

To be eligible for development under the Conservation Subdivision Option, a site must, at a minimum:

2.1 Be located within (add district names) zoning district(s).

2.2 Be at least ten (10) acres in area and capable of supporting at least five (5) dwelling units per the requirements of these regulations.

2.3 Consist of either:

The "qualifying conditions" can be included in the individual zoning district articles where the use will be permitted. The provisions shown here are designed to be included in the conservation subdivision article. The articles for the individual districts should also indicate if the conservation subdivision is permitted by right, special exception, or conditional use and the minimum tract size (if applicable).

The following are additional Qualifying Conditions a municipality might consider:

2.4 The applicant shall demonstrate to the satisfaction of the municipality that adequate water supply can be provided for the intended residential and open space uses and for fire emergency purposes.

2.5 The applicant shall demonstrate to the satisfaction of the municipality that adequate sewage treatment and disposal facilities can be provided, consistent with the Township Sewage Facilities (Act 537) Plan, and further, subject to demonstration of compliance with all applicable regulations of the Chester County Health Department and the Pennsylvania Department of Environmental Protection.

2.6 The proposed development shall be generally consistent with the municipal comprehensive plan and the Chester County comprehensive plan as applicable.

 


This section lists the dwelling types (e.g., singles, twins, townhouses, etc.) permitted within the conservation subdivision options. The types of dwelling units permitted may vary depending upon the zoning district in which the conservation subdivision is proposed. Other permitted uses would include accessory uses typically allowed in conjunction with a residential use. (The "Permitted Uses" section can also be handled through the individual zoning district articles rather than within the conservation subdivision standards.)

3.0 Permitted Uses

3.1 Single-Family Detached Conservation Design Option. This design option allows for single-family residential development on smaller lots with at least sixty-five (65) percent of the gross tract reserved for open space.

3.2 Mixed Residential Conservation Design Option. This design option provides for a range of residential dwelling types at a higher density with at least fifty (50) percent of the gross tract reserved for open space.

3.3 Village Design Option. This option allows for a variety of residential dwelling types designed and arranged to incorporate the design principals of traditional villages, which include: a mix of residential and commercial uses; a compact form, a well-defined edge that separates the development from the surrounding undeveloped land; and a pedestrian orientation. At least seventy-five (75) percent* of the tract is reserved for open space. Small scale commercial uses may also be incorporated into the village option.

*Note: this open space requirement can range between 65-75 percent. In general, higher percentages of open space should be required when higher densities are permitted.

 


The formulas for calculating the minimum required open space and maximum permitted number of dwelling units are included in this section of the ordinance. While there are several different methods possible for determining these numbers, a density multiplier is often used for determining the maximum number of units based on the net tract size.

The tract size is typically adjusted based on the natural constraints present as well as easements, rights-of-way, and existing streets or utility easements. The multiplier times the tract size provides the maximum number of dwelling units permitted in the subdivision. The minimum percentage of open space required is also specified for each district and may be further increased depending on the level of the site constraints (steep slopes, floodplain, etc.) present.

 


 

In general, the intent is to keep the base density neutral with or close to that of a conventional development. Some municipalities allow for additional units to encourage the use of the conservation subdivision option. The applicant may be required determine the number of units permitted through conventional zoning by developing a "yield plan" or calculating the potential units after constrained lands are subtracted. The density permitted under the conservation subdivision is tied back to this determination. This approach is used in the Growing Greener Conservation by Design concept.

4.0 Example 1 — Open Space and Density/Dwelling Unit Calculation

Determination of the maximum number of permitted dwelling units for the Single-Family Detached Conservation Design Option, the Mixed Residential Conservation Design Option, and the Conventional Subdivision Option shall be based upon the adjusted tract acreage of the site and the calculations set forth below.

4.1 Adjusted Constrained Lands. The sum of the constrained land shall be determined as indicated in Figure B-1. Where more than one type of constrained land overlaps, the constrained land with the higher percentage deduction shall apply.

Figure B-1

Constraint Percent Constrained Area to be Deducted (multiplier)
1 Land within rights-of-way of existing public streets, or within the rights-of-way for existing or proposed over-head utility lines. 100 percent (1.00)
2 Land under existing private streets. 100 percent (1.00)
3 Wetlands 95 percent (0.95)
4 Floodways within 100-year floodplain 100 percent (1.00)
5 Floodfringe (floodplain excluding floodways or wetlands within floodplains) 50 percent (0.50)
6 Prohibitively steep slopes (25%+) 80 percent (0.80)
7 Precautionary slopes (15% to 25%) 30 percent (0.30)
8 Extensive rock outcroppings (>1,000 s.f. in area) 90 percent (0.90)
Total Adjusted Constrained Lands
Formula: Adjusted Constrained Lands = sum of 1 through 8

 

4.2 Adjusted Tract Area The Adjusted Tract Area (ATA) shall equal the Gross Tract Area (GTA) minus the Adjusted Constrained Lands as determined in subsection 4.1 above. Formula: Adjusted Tract Area = Gross Tract Area - Adjusted Constrained Lands

4.3 Permitted Dwelling Units The maximum number of permitted dwelling units equals the Adjusted Tract Area multiplied by the density factors stated in Section        for each development option (i.e., RC-1=0.33, RR-1=0.55, R1-1=1.0, and R1-2=0.6). Formula: Maximum Dwelling Units = Adjusted Tract Area x Density Factor

4.4 Minimum Open Space The minimum open space required equals the percentage of the adjusted tract acreage depending on development option chosen (i.e., RC-1=70%, RR-1=60%, and R1-1=50%) plus the adjusted constrained lands. Formula: Open Space = Percent of Adjusted Tract Acreage + Adjusted Constrained Lands

Sample calculation for the RR-1 Option

Tract Conditions: 100 acre gross tract; 16 acres of adjusted constrained lands. 84 acre adjusted tract area (100 acres gross tract area minus 16 acres of adjusted constrained lands).

Open Space requirement = (required open space x adjusted tract area) + adjusted constrained lands (60% open space x 84 acres) + 16 acres = 66.4 acres

Maximum number of units = adjusted tract area x density multiplier (0.55) 84 acres x 0.55 = 46 dwelling units

 


4.0 Example 2 — Open Space and Density/Dwelling Unit Calculation

In this example, densities of Districts R-1, R-2, and R-3 are listed from lowest density district to highest density district.

4.1 Restricted Open Space

4.2 Maximum Density of Development

Sample calculation for the R-2 District

Tract Conditions: 100 acre gross tract; 84 acre net tract area (100 acres gross tract area minus 16 acres of constraints/exclusions in Section 2.1)

Open Space Requirement = 55% of gross tract area 100 acres x 0.55 = 55 acres

Maximum Number of Units = net tract area x density multiplier (0.50) 84 acres x 0.50 = 42 dwelling units

*Note: The density calculation section of a conservation subdivision ordinance can also include provisions for density bonuses (for example, for the provision of publicly accessible open space or affordable housing).

 


The dimensional standards apply to the individual building lots within the conservation subdivision and are particularly applicable to the Single-Family Detached and Mixed Residential Conservation Design Option (see Section 3.0- permitted uses). Minimum lot sizes and building setbacks can be established for each type of dwelling unit. Another option is to specify minimum separation distances between proposed dwellings rather than requiring a minimum lot size. This approach provides the maximum flexibility for subdivision design layout, but may be more difficult to review and administer. Maximum impervious surface limitations can be specified here. This section might also include minimum setbacks around the perimeter of the conservation subdivision tract, however, the configuration of the open space is dealt with in the next section.

5.0 Dimensional Standards

Under the Single-Family Detached Conservation Design Option and Mixed Residential Conservation Design Option, lot boundaries shall be shown, but in lieu of a minimum lot area, the following lot and yard area regulations shall apply to any principal buildings or any other buildings whether the buildings are located on the same lot or on a separate lot:

5.1 Minimum separation distances between buildings, except as provided for accessory buildings in Section 5.3 below, shall be as follows:

5.2 Principal or accessory buildings shall be located no less than eight (8) feet from any lot line.

5.3 Minimum separation at any point between accessory buildings (e.g., detached garages or sheds) and the principal buildings to which they are accessory shall not be less than twelve (12) feet; minimum separation distances between accessory buildings and any other building shall comply with Section 5.1 above.

Municipalities may want to allow accessory buildings on smaller lots than 10,000 s.f. as they view appropriate.

5.4 Accessory buildings shall not be permitted on residential lots of less than ten-thousand (10,000) square feet in gross area.

5.5 No exterior windows (except for clerestory windows), doors, or other openings shall be permitted in any portion of principal or accessory buildings located less than five (5) feet from any lot line.

5.6 Where greater setbacks do not otherwise apply, front-facing garages, whether attached or detached, shall be set back a minimum of thirty-five (35) feet from the edge of the right-of-way or from the sidewalk, whichever results in the greatest setback. In addition, front-facing garages shall be set back a minimum of eight (8) feet from the front façade of the dwelling unit. If the front façade is not uniform, the eight (8) foot setback shall be measured from the point of the façade nearest the street.

Provisions for maximum impervious surface should also be included in the ordinance standards. A sliding scale or formula is recommended because of the many variations in lot sizes possible.

5.7 Minimum setback from the edge of the cartway (or outside edge of the curb if applicable) of any new local road which is part of the proposed subdivision/land development shall not be less than twenty-five (25) feet, except as provided for in Section 5.6 above. Where abutting a new arterial or collector road within the proposed subdivision/land development, the setbacks shall be as follows: arterial road: seventy-five (75) feet; collector road: sixty-five (65) feet.

5.8 In addition to the individual building lot setback requirements, new structures shall meet the following guidelines for minimum setbacks whether the adjacent use is on or off the site. These setbacks may be modified subject to approval by conditional use:

5.9 For each lot created under this development option, the applicant shall indicate a building envelope which complies with the dimensional standards above and with the minimum buildable area requirements of Section 902, Natural Resource Conservation Overlay District.

 


6.0 Open Space Configuration and Use

This section provides guidance on the preferred configuration of the open space and lists the types of uses permitted within the open space. Uses not permitted in or which may not count towards the required the open space are also addressed in this section.

6.1 The following guidelines shall be used when planning and designing the subdivision layout:

6.2 Configuration of Protected Open Space — Areas designated for open space shall be configured to meet the following purposes and guidelines:

Additional screening may be necessary when buffering cannot be fully achieved through the configuration of the open space. Municipalities can also address scenic viewshed protection on a larger scale through the establishment of a Scenic Overlay District. See the Maintain Existing Character and Context design element for ordinance considerations and sample language.

6.3 Scenic Viewshed Protection — Improvements such as buildings, structures, and parking areas shall be located or screened to minimize the impact on scenic views and the disturbance of natural features. The applicant shall undertake a scenic viewshed inventory and analysis to address the impact of the new development on scenic resources.

6.4 Uses Permitted in the Open Space — Areas designated as protected open space may be used for the following purposes:

6.5 Limits on Constrained Lands in the Open Space — No more than sixty (60) percent of common open space shall be comprised of floodplains, wetlands, steep slopes in excess of twenty five (25) percent, or the elements of sewage treatment and stormwater management facilities permitted within the open space under Section 6.4.

6.6 Accessibility of Open Space — For conservation subdivision designs that provide commonly owned open space, a minimum of twenty percent (20%) shall be accessible and usable for residents of the development for passive and/or active recreation .

 


This section specifies the various ownership options for the preserved open space. Typically these options include: fee simple dedication to the municipality or a private conservation organization; dedication of an easement to the municipality of a private conservation organization; or ownership by a homeowner's association. In some cases, such as when the open space is a preserved farm or an estate lot, the open space may stay in private ownership with a permanent restriction against future development.

7.0 Open Space Ownership

Subject to permanent conservation restrictions, designated open space land in any subdivision may be owned by a homeowners' association, the municipality, a land trust, another conservation organization recognized by the municipality, or by a similar entity approved by the municipality, or may remain in private ownership.

7.1 Fee Simple Dedication to the municipality — The municipality may, but shall not be required to, accept dedication in the form of fee simple ownership of designated open space land. Where the municipality accepts dedication of designated open space land that contains improvements, the governing body may require the posting of financial security to ensure structural integrity of said improvements as well as the functioning of said improvements for a term not to exceed eighteen (18) months from the date of acceptance of dedication. The amount of financial security shall not exceed the actual cost of installation of said improvements plus fifteen (15) percent.

7.2 Homeowners' Association — The designated open space land and associated facilities may be held in common ownership by a homeowners' association. The association shall be formed and operated under the following provisions:

7.3 Condominium Ownership — The designated open space land and associated facilities may be held in common by the unit owners as a condominium, the documents for which shall be approved by the governing body. Such condominium documents shall be in conformance with the Pennsylvania Uniform Condominium Act of 1980, as amended. All common open space land shall be "common elements" or "limited common elements." To the degree applicable, condominium documents shall comply with the provisions of section 7.2 above. Condominium documents shall be recorded with the final subdivision and land development plans. At the time of preliminary plan submission, the applicant shall provide draft condominium documents with sufficient detail to demonstrate feasible compliance with this section.

7.4 Dedication of Easements to the Municipality — The municipality may, but shall not be required to, accept easements for public use of any portion or portions of designated open space land. In such cases, title to the land which remains in common ownership by condominium unit owners, homeowners' association, or private conservation organization are held by the municipality.

7.5 Private Conservation Organization or the County — With the permission of the municipality, an owner may transfer either fee-simple title of the open space or easements on the open space to a private, nonprofit organization recognized by the municipality, among whose purposes it is to conserve open space and/or natural resources, or the County, provided that:

7.6 Non-Common Private Ownership of Designated Open Space

 


This section requires that the applicant provide an open space management plan. The plan should specify how the open space will be maintained and the personnel and financial resources necessary to properly maintain it. The plan should be recorded with final subdivision plans at the office of the County Recorder of Deeds.

8.0 Open Space Maintenance Standards

Unless otherwise agreed to by the governing body, the cost and responsibility of maintaining common facilities and open space shall be borne by the property owner, condominium association, homeowners' association, or conservation organization as outlined below.

8.1 Required Open Space Management Plan — The applicant shall provide a plan for the long term management of the designated open space which is to be created as part of the development, including maintenance and management of any wastewater disposal, water supply, stormwater management or any other common facilities which may be located within areas of designated open space.

8.2 Provisions for Maintenance of Designated Open Space