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File #: 19-387    Version: 1 Name:
Type: Presentation Status: Agenda Ready
File created: 3/25/2019 In control: City Commission
On agenda: 4/9/2019 Final action:
Title: Intracoastal Waterway Water Level and Infrastructure Vulnerability: Presentation of Ordinance Alternatives for Implementation of Seawall Elevations and Improvements of Private Seawalls
Sponsors: Public Works Department - Programs & Project Manag
Attachments: 1. Agenda Cover Report, 2. Other Municipal Ordinances, 3. City of Delray Beach - Water Level Infrastructure Vulnerability Study_FINAL, 4. Seawall Vulnerability Summary, 5. Seawall Ordinance Presentation 3.29.pdf
Related files: 19-163
Date Ver.Action ByActionResultAction DetailsMeeting DetailsVideo
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TO: Mayor and Commissioners
FROM: Missie Barletto, Assistant Public Works Director
THROUGH: Neal de Jesus, Interim City Manager
DATE: April 9, 2019

Title
Intracoastal Waterway Water Level and Infrastructure Vulnerability: Presentation of Ordinance Alternatives for Implementation of Seawall Elevations and Improvements of Private Seawalls

Body
Recommended Action:
Recommendation
Provide direction regarding the City's desired ordinance to mandate seawall elevations and timing of improvements to improve resiliency to coast flooding City-wide

Body
Background:
In October 2018, the City of Delray Beach (City) completed an Intracoastal Waterway Water Level and Infrastructure Vulnerability Study (Study), the results of which were presented to commission on February 12, 2019. The Study looked at today's water levels in comparison with those projected for the next 30 years. The Study recommended that the City use an elevation range of 3.9 to 4.4 feet when planning for infrastructure improvements on a 30-year planning horizon.

The City is primarily vulnerable to coastal flooding due to low or unmaintained seawalls and low or unprotected stormwater inlets. The City has developed a strategy to systematically install backflow prevention devices throughout the public stormwater system to address the low or unprotected inlets. To guide the implementation of the seawall improvements by private residents, ordinances can mandate elevations and timing of improvements to improve resiliency to coastal flooding City-wide. The recently completed Study explored several alternatives that will be presented for review and selection:
1. Public / Private Partnership
a. The responsibility to maintain, raise, repair and replace private seawalls remain with the private owners, except as required by existing City Code of Ordinances
2. Ordinance with Minimum Elevation and Timeline Requirement
a. City adopts seawall elevation standards and timeline that all seawalls would be required t...

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