Morrisville UDO - June 2017 version

Article 5: Development Standards

Section 5.7. Perimeter and Streetyard Buffers

5.6.7. Standards for Floodways and Non-Encroachment Areas

Morrisville, NC

June 23, 2017

Unified Development Ordinance

Page 5-29

All subdivision, manufactured home park, and other development proposals shall provide Base

Flood Elevation (BFE) data if development is greater than five acres or has more than 50

lots/manufactured home sites. Such Base Flood Elevation (BFE) data shall be adopted by reference

to be utilized in implementing this Ordinance.

When Base Flood Elevation (BFE) data is not available from a federal, State, or other source, the

reference level shall be elevated to or above the regulatory flood protection elevation.

5.6.7.

Standards for Floodways and Non-Encroachment Areas

Areas designated as floodways or non-encroachment areas within the Special Flood Hazard Areas are

extremely hazardous areas due to the velocity of floodwaters that have erosion potential and carry debris

and potential projectiles. The following standards shall apply to all development within such areas in addition

to the standards i

n 5.6.5, Standards for Special Flood Hazard Areas with Flood Elevation Data:

No encroachments—including fill, new construction, substantial improvements, and other development—

shall be permitted unless it has been demonstrated that:

The proposed encroachment would not result in any increase in the flood levels during the

occurrence of the base flood, based on hydrologic and hydraulic analyses performed in

accordance with standard engineering practice and presented to the Town Engineer before

issuance of a Floodplain Development Permit, or

A Conditional Letter of Map Revision (CLOMR) has been approved by FEMA and a Letter of Map

Revision (LOMR) is obtained upon completion of the proposed encroachment.

If subsection

A above

is satisfied, all development shall comply with all applicable flood hazard

reduction standards in

5.6.3

throug

h 5.6.6.

Manufactured homes may be permitted provided the following provisions are met:

The anchoring and the elevation standards of Section

5.6.5.C, Manufactured Homes;

and

The no encroachment standard of subsection

above.

(Ord. No. 2014-051, 11/10/2014)

SECTION 5.7.

PERIMETER AND STREETYARD BUFFERS

5.7.1.

Purpose

Perimeter buffers are intended to provide spacing and landscaping between proposed development

and adjoining property developed or zoned for significantly different uses to help mitigate potential

negative impacts on or from development activities on adjoining properties.

Streetyard buffers are intended to provide spacing and landscaping between proposed development

and adjoining streets. These buffers mitigate potential adverse impacts from traffic on the adjoining

street, provide a transition between public and private realms, create an attractive, unifying edge along

the street for motorists and pedestrians, and provide shading of streets and sidewalks.

(Ord. No. 2016-001, 05/10/2016)

5.7.2.

Applicability

New Development

Except as otherwise provided in Section

5.7.2.C, Exemptions,

the standards in this section shall

apply to all new development.

(Ord. No. 2016-001, 05/10/2016)