Morrisville Unified Development Ordinance - June 2017

Article 5: Development Standards Section 5.7. Perimeter and Streetyard Buffers 5.6.7. Standards for Floodways and Non-Encroachment Areas

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.

Standards for Floodways and Non-Encroachment Areas

5.6.7.

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 in 5.6.5, Standards for Special Flood Hazard Areas with Flood Elevation Data: A. 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. B. If subsection A above is satisfied, all development shall comply with all applicable flood hazard reduction standards in 5.6.3 through 5.6.6.

C. 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 1 above.

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

SECTION 5.7. PERIMETER AND STREETYARD BUFFERS

Purpose

5.7.1.

A. 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. B. 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)

Applicability

5.7.2.

A. 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)

Morrisville, NC

June 23, 2017

Unified Development Ordinance

Page 5-29