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Durham City Zoning Code

Article

13 Additional Requirements for Subdivisions

Sec. 13.1 Preservation of Significant Features

SubdivisionClosed design shall be sensitive to the protection and preservation of existing site features, natural and man-made. To the maximum extent possible, subdivisionsClosed shall be designed to preserve structures and sites of historic or cultural significance, small familyClosed cemeteriesClosed, and to protect habitats of rare or unusual plants or wildlife as documented in the established Durham InventoryClosed, the State Natural Heritage Listing, or the National Register of Historic Places.    

Sec. 13.8 Ownership Alternatives

13.8.1. SubdivisionsClosed shall not receive final platClosed approval until the applicant furnishes an attorney's certification that proper legal provisions have been made for the following, as applicable:

A. Establishment of property ownersClosed association;

B. Declaration of covenants and restrictions for common areas;

C. Declaration of unit-ownership developmentClosed; and

D. Provisions for perpetual ownership and maintenance of commonly-owned streets, utilities, other improvements, and lands.

13.8.2. All final platsClosed containing private streets and roadsClosed shall contain a note requiring a disclosure statement to be furnished to all subsequent purchasers of property shown on the platClosed.

13.4.3. Block Length Requirements

A. Streets shall be laid out such that the requirements can be met both within and between proposed and future subdivisionsClosed on adjacentClosed land through the use of stub outClosed requirements within Sec. 12.3, Streets.

  Table 1: BlockClosed Length Requirements

Zoning Districts

Maximum BlockClosed Length (ft)

Maximum Block PerimeterClosed (ft)

Minimum Site Acre Applicable

(acres)

RU-M, RC (20 max); RS-M(D) (18 max); PDR (above 8.000); CSD; MU; CD; DD; CI; CN

550

1,400

2

RU-5 (8 max); RS-M (8 max); RS-8 (5 max); PDR (below 8); OI; CG; CC

920

2,880

5

RR; RS-20 (2 max); RS-

10 (4 max); I; IL; IP; SRP;

UC

1,200

4,000

10

Commentary: The maximum blockClosed perimeters correspond to a maximum average blockClosed length of 350 ft, 720 ft, and 1,000 ft.

B. Within a single phase of any subdivisionClosed or developmentClosed, individual blockClosed perimeters shall be permitted to exceed the maximum by 25% provided that the average of all blockClosed perimeters in the phase does not exceed the maximum.

C. The requirements contained in Table 1 shall not apply if at least one of the following conditions prevents a through connection:

1. Obstacles associated with prior plattingClosed of property from another landowner; 

2. Construction of existing buildings or other barriers; 

3. Railroad or utility right-of-wayClosed; or

4. Existing limited-access motor vehicleClosed right-of-wayClosed.

13.5.1. Access

Every buildable lot shall abut a public street, a private street, or a drivewayClosed allowed for access under paragraph 12.2.2B.2.b above, capable of providing access to a lot.

13.5.2. Side Lot Lines

Side lot lines shall intersect rights-of-way between 60 and 90 degrees on a straight street, or from the tangent of a curved street.

13.5.3. Double Frontage

A. For a residential lot that has frontage on two nonintersecting local or collector streets, the following shall apply:

1. For a lot with a single-familyClosed structureClosed, the lot shall be accessed from one street only with treatment such as a berm, walls, or landscaping fronting on the second street to preclude access. This shall not apply for access to an accessory dwelling unitClosed.

2. For a lot with an accessory dwelling unitClosed, two-familyClosed structureClosed, or multifamilyClosed structureClosed, the lot can be accessed from both streets as long as access points are offset to inhibit cut-through traffic.

B. Residential lots adjacentClosed to a boulevardClosed or major/minor thoroughfare shall have vehicular access from the local streetClosed only.

C. Nonresidential lots with double frontage shall have offset access points to inhibit cut-through traffic.

13.6.2. Connectivity Defined

A. Except in Design Districts, connectivity shall be defined by the ratio of links to nodes in any subdivisionClosed.

1. The connectivity ratio shall be the number of street links divided by the number of nodes (Links/Nodes).

2. A link shall be any portion of a street, other than an alleyClosed, defined by a node at either end. Stub-outs to adjacentClosed property shall be considered links. For the purpose of determining the number of links in a developmentClosed, boulevards, median-divided roadways, and divided entrances shall be treated the same as conventional two-way roadways.

a. Any portion of a street, connected by a node at either end, including sidewalks and pedestrian connections in accordance with Sec. 12.4, Stub OutsClosed, to adjacentClosed property, transit stops, and streets including sidewalks per paragraph 12.4.2.

b. For the purpose of determining the number of links in a developmentClosed, boulevards, median-divided roadways, and divided entrances shall be treated the same as conventional two-way roadways.

Table 1. Connectivity Ratio Link Scoring Matrix

Type of Link

Connectivity Ratio Score (0.5-2)

Street (including required sidewalks per paragraph 12.4.2)

1: Street with required sidewalks per paragraph 12.4.2

2: Streets with sidewalk and exclusive on-road bicycle facilities

Stub OutClosed

0.5

Transit Stop (score received with the developmentClosed of a new stop or developmentClosed of ADA accessible connections to an existing stop within 500 feet of the developmentClosed)

2: Construction of a new transit stop with ADA accessible design and pedestrian connection within 15 feet; or ADA accessible improvements and pedestrian connection within 15 feet to an existing transit stop 500 feet or less from the subject site.

Additional Pedestrian Connections (in accordance with UDO paragraph 12.4.3C) within the developmentClosed (constructed greenway trails, mid-blockClosed pedestrian passagesClosed linking parallel right of ways, cul-de-sacClosed connection walkways)

2: All-weather pedestrian pathway of solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code with a minimum of 8-foot width. Additional lighting features as described in Sec. 7.4, Outdoor Lighting.

 

1.5: Less than 8-foot width pedestrian pathway constructed from a naturally occurring or loose material such as mulch or gravel.

Bicycle Connections

1.5: Off-road bicycle facility as described in Sec. 12.4, Pedestrian and Bicycle Mobility.

Commentary: The different types of links and nodes have been weighted and scored differently based on how the specific infrastructure adds to connectivity and how it contributes to the ratio scoring matrix. A higher scoring link equates to a more desirable link, while a higher scoring node equates to a less desirable node.

 

3. A node shall be:

a. The terminus of a street or the intersection of two or more streets. A divided entrance shall only count once.

Table 2. Connectivity Ratio Node
Scoring Matrix

Type of Node

Score

Four-Way Intersection

1

Three-Way Intersection

1.25

Cul-de-sacClosed

1.5

 

Figure 1. Types of Nodes

Diagram

Description automatically generated

4. Additional Requirements
a. Pedestrian Links Required:

A (publicly accessible) pedestrian link shall be required between a neighborhood link or node including cul-de-sacClosed bulb or street turnaround, within 500 ft or less of the next closest connection to an adjacentClosed pedestrian connection and/or to significant pedestrian generators or destinations such as schools, parks, trails, employment centers, commercial areas, residential neighborhoods, or similar features.

Required pedestrian links shall be constructed from all-weather solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code and comply with the most recent accessibility standards as published under the Americans with Disabilities Act (ADA).

The requirements contained in Table 1 shall not apply if at least one of the following conditions prevents a through connection:

Obstacles associated with prior plattingClosed of property from another landowner;

Construction of existing buildings or other barriers;

Railroad or utility right-of-wayClosed; or 

Existing limited-access motor vehicleClosed right-of-wayClosed.

b. Cross Access Required:

In addition to meeting all the requirements of paragraph 13.6.1C, Pedestrian Links Required, pedestrian links shall be provided between compatible uses such as civic, institutional, commercial, and residential uses.

 

B. Connectivity in Design Districts

For Design Districts, see Sec. 16.4, StreetscapeClosed, Right-of-WayClosed, and BlockClosed/Lot Standards.

13.6.3. Required Ratio

A. Street Network

The street networkClosed, including common access drivewaysClosed permitted in paragraph 12.2.2B.2.b, DrivewaysClosed, for any subdivisionClosed with internal roadsClosed or access to any public roadClosed shall achieve a minimum connectivity ratio of 1.15 in the Rural Tier, 1.40 in the Suburban Tier, 1.60 in the Urban and Compact Tier.

B. Street links and nodes along a collector or arterial street providing access to a proposed subdivisionClosed shall not be considered in computing the connectivity ratio.

C. Required stub-outs that cannot be constructed pursuant to paragraph 12.3.1F, Stub OutsClosed, shall be considered as being present as a link at the ratio of one link per side as provided in paragraph 12.3.1F, Stub OutsClosed, for purposes of determining if the required ratio has been met.

Figure 2. Connectivity Ratio Example

Diagram

Description automatically generated

13.9.1. Preliminary plats and site plans shall indicate proposed phasing, with no individual phase exceeding 50 acres.

A. Phasing plans shall be included in the first submittal and shall be reviewed and evaluated as part of the overall developmentClosed.

1. Off-site improvements are excluded from phasing; however, they may be required within a certain phase to satisfy overall developmentClosed requirements.

2. Phases shall be designed to ensure the efficient construction of future phases. Each phase of a developmentClosed shall be designed and function with the utilities, fire protection, right-of-wayClosed infrastructure, and stormwaterClosed management necessary to serve that phase.

3. Each phase shall contain the minimum tree coverage percentage as required per Sec. 8.3, Tree Protection and Tree Coverage.

4. Lot numbers shall not be duplicated within different phases of the same subdivisionClosed.

B. All right-of-wayClosed and/or easementsClosed for public infrastructure servicing the respective phase must be recorded with the first platClosed.

C. Water and sewer extension permit applications for each individual phase of the project are required after plan approval.

D. No land disturbing activityClosed in a subsequent phase shall commence until:

1. The first asphalt layer of the street or other vehicular system of the previous phase has been laid and inspected; and

2. The lot(s) in the previous phase have been stabilized, inspected, and approved per the County and State SedimentationClosed and ErosionClosed Control standards.