Morrisville Unified Development Ordinance - February 2021.2

Article 6: Riparian Buffers Section 6.8. Uses and Activities Permitted in Riparian Buffers 6.6.3. Riparian Buffer Variance Review Standards

Table 6.8: Uses and Activities Permitted in Riparian Buffers Use or Activity Exempt [1] Allowable [2]

Allowable with Mitigation [3]

X

Excavation of the streambed in order to bring it to the same elevation as the invert of a ditch [8] Drainage of a pond in a natural drainage way provided that a new riparian buffer that meets the requirements of this article is established adjacent to the new channel Driveway crossings of streams and other surface waters subject to this article: Driveway crossings on single family residential lots that disturb no more than 25 linear feet or 2,500 square feet of riparian buffer Driveway crossings on single family residential lots that disturb more than 25 linear feet or 2,500 square feet of riparian buffer Driveway crossings in a subdivision that cumulatively disturb no more than 150 linear feet or 1/3 acre of riparian buffer Driveway crossing in a subdivision that cumulatively disturb more than 150 linear feet or 1/3 of an acre of riparian buffer Driveway impacts other than crossing of a stream or other surface waters subject to this article [9] Fences where disturbance is minimized and installation does not result in removal of trees as defined in this Ordinance Fences where disturbance is minimized and installation results in removal of trees as defined in this Ordinance [9] Fertilizer application: one-time application to establish vegetation Grading and revegetation in Zone Two where diffuse flow and the health of existing vegetation in Zone One is not compromised and disturbed areas are stabilized until they are revegetated Grading and revegetation in Zone Two where diffuse flow and the health of existing vegetation in Zone One is not compromised and disturbed areas are stabilized [8] Greenway/hiking trails designed, constructed, and maintained to maximize nutrient removal and erosion protection, minimize adverse effects on aquatic life and habitat, and protect water quality to the maximum extent practical [9] Maintenance access on modified natural streams via a grassed travel way on one side of the water body where less impacting alternatives are not practical, the width and specifications of the travel way are only that needed for equipment access and operation, and the travel way is located to maximize stream shading [9] Mining activities covered by the Mining Act where new riparian buffers that meet the requirements of Section 6.3, Riparian Buffers and Zones, and Section 6.7, Diffuse Flow Requirements, are established adjacent to the relocated channels Mining activities not covered by the Mining Act OR where new riparian buffers that meet the requirements of Section 6.3, Riparian Buffers and Zones, and Section 6.7, Diffuse Flow Requirements, are not established adjacent to the relocated channels Wastewater or mining dewatering wells with approved NPDES permit Piping of a stream allowed under a permit issued by the U.S. Army Corps of Engineers [9] Playground equipment on lots with single-family detached or manufactured home dwellings where installation and use does not result in removal of vegetation Greenway/hiking trails [8] Historic preservation

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Morrisville, NC

February 1, 2021

Unified Development Ordinance

Page 6-13