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Article 5: Development Standards
Section 5.3. Subdivision Blocks, Lots, and Reference Points
5.3.3. Subdivision Reference Points
Morrisville, NC
June 23, 2017
Unified Development Ordinance
Page 5-3
F.
The creation of through lots shall be avoided except where necessary to provide access to residential
development from a street other than a major or minor thoroughfare, or to overcome specific
disadvantages of existing, pre-development topography and lot configuration.
G.
The creation of flag lots is prohibited.
H.
Lot lines shall intersect a fronting street right-of-way or easement in a substantially perpendicular manner
or radially to curves or cul-de-sacs.
I.
No lot shall be created so as to be so irregularly shaped with a shape factor in excess of 35. Shape
factor equals the square of the lot perimeter divided by the net lot area (P
2
/A).
J.
Where land is subdivided into parcels large enough to be further divided into ordinary sized building
lots, such parcels shall be arranged to allow for the opening of future streets and logical further
subdivision.
K.
The size, shape, and orientation of nonresidential lots shall be appropriate for the type of development
and use contemplated.
L.
No more than one single-family detached, duplex, manufactured home or single-family attached
dwelling is permitted per lot.
(Ord. No. 2015-002, 04/29/2015; Ord. No. 2016-001, 05/10/2016)
5.3.3.
Subdivision Reference Points
A.
Monuments and Control Corners
Permanent monuments shall be placed at not less than two corners of the subdivision. Additional
monuments shall be placed where necessary to ensure that no point within the subdivision lies more
than 500 feet from a monument.
Two or more of the monuments shall be designated as control corners. Such monuments may be of
concrete or iron pipe. Where concrete monuments are employed, they shall have an indented cross
metal pin or plate at the top to properly identify the point. All monuments and control corners shall
be made of such materials and installed in such manner as established by the North Carolina Board
of Examiners for Engineers and Land Surveyors.
All monuments and control corners shall be shown on the Final Plat.
B.
Markers
All lot corners, all points where the street lines intersect the exterior boundaries of the subdivision, and
all angle points and points of curve in each street, shall be marked with iron pipe not less than ¾ inch in
diameter and 30 inches long, and shall be driven so as to be within one inch of finished grade.
C.
Property Corner Tie
At least one corner of the property surveyed shall be designated by course and distance (tie) from a
readily discernible reference marker. If a corner is within 2,000 feet of a U.S. coast and geodetic station
or state grid system coordinated monument, then this corner shall be marked with a monument so
designated and shall be accurately tied to the station or monument by computed X and Y coordinates.
The station or monument shall be located on the Final Plat to an accuracy of 1:15,000 with a statement
identifying the station or monument. If such a monument or station is not available, the tie shall be made
to some permanent and readily recognizable landmark or identifiable point, physical object, or structure.
D.
Subdivision Survey Accuracy
Angular error of closure shall not exceed 20 seconds times the square foot of the number of angles
turned.