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File #: 19-144    Version: 1 Name:
Type: Agendas Status: Agenda Ready
File created: 4/12/2019 In control: Board of Aldermen
On agenda: 4/16/2019 Final action:
Title: Discussion and Request to set a Public Hearing on Land Use Ordinance Amendments Related to Stormwater Management PURPOSE: The purpose of this agenda item is for the Board of Aldermen to discuss options related to post-development rate of discharge stormwater requirements and consider setting a public hearing on an ordinance amending stormwater volume control provisions.
Attachments: 1. Attachment A - Resolution, 2. Attachment B - NOAA Atlas 14 Carrboro, 3. Attachment C - Lopez-Cantu and Samaras , Environ. Res. Lett. 13 (2018) 074006, 4. Attachment D - LUO Amendment - Volume Control 4-11-2019, 5. Attachment E - Section 15-263 Stormwater Volume
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TITLE: Title
Discussion and Request to set a Public Hearing on Land Use Ordinance Amendments Related to Stormwater Management
PURPOSE: The purpose of this agenda item is for the Board of Aldermen to discuss options related to post-development rate of discharge stormwater requirements and consider setting a public hearing on an ordinance amending stormwater volume control provisions.
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DEPARTMENT: Planning

CONTACT INFORMATION: Patricia McGuire - 919-918-7327, pmcguire@townofcarrboro.org

INFORMATION: This agenda item addresses two aspects of stormwater management- rate and volume of post-development controls. The Board of Aldermen's request for adjustments to design storm specifications followed discussions of recent developments and community concerns that existing stormwater requirements may not sufficiently address risks associated with uncertain climate and weather patterns and related variability in rainfall. Specific discussions and directions have involved changing the design storm for stormwater quantity regulations from current (i.e. the 1-,2-, 5-, 10-, and 25-year, 24-hour storm event) to include the 50- and 100-year storm event. In the midst of several other projects, staff has been gathering information to understand Carrboro's current regulations in the context of other local governments in North Carolina and elsewhere in and any research that might be useful in informing the Town's selection of updated stormwater requirements. This is a work in progress; to date it has revealed that the Town's use of the 25-year storm event is not used in all locales. This is sometimes countered by a provision found elsewhere to require a "10-percent analysis" in addition to the more common, 10-year design storm standard. In addition to the consideration of expanding stormwater requirements to include storms of lesser probability, staff has also been considering changes to the duration of the storm. One option that is used elsewhere is to require ana...

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