The City of Miami Beach, a highly urbanized coastal community in southeast Florida and a major economic resource to the region and continues to be a leader in adapting to the impacts of climate change. In 2011, the City engaged a Consultant to develop a Stormwater Master Plan which recommended projects to manage the City’s stormwater runoff and established the City’s Level of Service and criteria for stormwater infrastructure design. The City approved resolution 2012-28068 on November 14, 2012 which adopted the Stormwater Master Plan. Subsequently, the City amended the stormwater master plan as adaptions for climate change and sea level rise were required. Some of the most critical historical amendments include the following:

• The City adopted Resolution 2014-28499 on February 12, 2014, which approved the recommendation of The Flooding Mitigation Committee to amend the 2011 SWMP by modifying the design criteria for the tailwater elevation from 0.5 Ft- NAVD to 2.7 Ft-NAVD for all tidal boundary conditions.
• The City adopted Resolution 2014-28684 on July 23, 2014 which accepted the recommendation of the Flooding Mitigation Committee to amend the 2011 SWMP for minimum seawall elevation from 3.2 feet NAVD to 5.7 feet NAVD, however the 5.7 NAVD elevation for seawalls shall not apply to minor seawall repairs less than $300 per linear foot at "2014 Consumer Price Index ( CPI)".
• On July 21, 2015, the Mayor's Blue Ribbon Panel on Flooding and Sea Level Rise recommend that the seawall cap on all new private construction and all public seawall construction be changed from 3.2 feet NAVD to 5.7 feet NAVD throughout the City; however, on existing private seawalls that are being replaced/ repaired not associated with new building construction, a minimum 4.0 NAVD elevation shall apply with the structural design to accommodate a seawall height extension to a minimum 5.7 NAVD; and
• On May 11, 2016, the City Commission adopted Ordinance 2016-4009 which amended Chapter 54 - " Floods", by establishing a minimum and maximum freeboard (minimum one foot / maximum five feet) above base flood elevation ( FIRM BFE = not less than 6.44 NAVD) for all properties and amend the Land Development regulations pertaining to the calculation of building height, and establish minimum elevations of required yards in single family districts; and
• On May 11, 2016, the City Commission adopted Ordinance 2016-4010, amending Chapter 118, of the Land Development Regulations relating to defining future grade" and " future crown of the road;"
• On June 8, 2016, the City Commission adopted the following modifications to the 2011 SWMP:

o   Modified Section 2. 5. 3 Proposed Level of Service to include, " Future crown of road and back of sidewalk elevations shall be 3.7 feet, NAVD, unless exempt due to hardship as determined by the Director of Public Works."

o   Modified Section 2. 5. 3 Proposed Level of Service to include, "For land development purposes, the future grade shall be 3.7 feet NAVD minimum."

o   Modify Section 2. 5. 3 Proposed Level of Service to state, " The stormwater level of service for roadways such that the crown of road is not overtopped during the 5 year/ 24 hour design storm event (with a 1.25 safety factor, SCS Type III rainfall distribution and a Unit Hydrograph peaking factor of 150).

o   Modified Section 2. 5. 3 Proposed Level of Service to state, "New construction or substantial reconstruction on private property shall retain storm water runoff from the 5 year/ 24 hour design storm of 7.5 inches of rainfall."

o   Modified Section 9. 2. 5 Seawall Heights to state, " All new seawalls on private

construction and all seawalls constructed on public projects shall have a

minimum elevation of 5.7 feet, NAVD, however, on existing private seawalls

that are being replaced/ repaired not associated with new building

construction, a minimum 4.0 NAVD elevation shall apply with the structural

design to accommodate a seawall height extension to a minimum 5.7 NAVD."

• On October 18, 2017, the City approved the recommendation to amend the 2011 Stormwater Master Plan to increase the level of service to protect from a 10-year/24-hour storm event.
• At its July 24, 2020 meeting, the City Commission amended the 2011 Stormwater Master Plan and incorporated three reports: 1) The Blue-Green Stormwater Infrastructure Concept Plan, dated February 28, 2020; 2) the Road Elevation Strategy and Recommended Sea Level Rise/Tidal Flood adaptation Project, dated February 28, 2020; and 3) the Neighborhood Project Prioritization Plan – Methodology and Results, dated April 1, 2020 under Resolution 2020-31317.

The intention of this update is to supersede the 2011 Stormwater Master Plan, integrate historical amendments listed above, incorporate recent studies including the Neighborhood Prioritization Plan, integrate the City’s ongoing water quality projects and future blue-green infrastructure projects, and create a 10-year plan to implement critical projects addressing nuisance flooding.

In 2022, the City retained AECOM to update the 2011 Stormwater Modeling and Master Plan under the executed agreement pursuant to RFQ 2020-096-ND.

Project progress updates have been provided to various Committees throughout the project lifecycle, including the following:

• On October 31, 2022, the Administration presented to the Finance and Economic Resiliency Committee, indicating that AECOM had initiated their work on the Stormwater Master Plan Update.
• The Administration provided a progress update on April 21, 2023 to Finance and Economic Resiliency Committee.
• On September 28, 2023 the Administration presented the Draft Stormwater Master Plan to the community in a public outreach meeting. The meeting was available both in person and remotely through Zoom. Residents who attended in person had the opportunity to discuss their questions and concerns one-on-one with City and consultant staff following the presentation. Additionally, the City distributed a link to a website where all meeting materials could be reviewed, and residents could submit their feedback and questions. Responses to questions were issued and follow up meetings were held as requested. The public meeting was intended to inform the community as well as to gather feedback for consideration in the Final Draft Stormwater Master Plan.
• On October 16, 2023, the Administration presented the draft Stormwater Master Plan Update to the Finance and Economic Resiliency Committee Members.  The Committee provided feedback and referred the Stormwater Master Plan—with the addressed comments— to the Commission for adoption of the proposed updated plan.
• The Administration also presented the Stormwater Master Plan Update to the Ad Hoc Neighborhood Resilience Project Advisory Committee on November 21, 2023.

The Committee and community feedback was evaluated and incorporated into this Final Stormwater Master Plan being presented to Commission for approval and adoption.

The Stormwater Master Plan is intended to identify stormwater improvements City-wide that will alleviate flooding under a 10-year, 24-hour design storm condition; to develop a City-wide water quality treatment strategy to protect the health of Biscayne Bay; and to develop a prioritized implementation plan for Neighborhood Improvement Projects, Water Quality Projects, Blue-Green Infrastructure Projects, and Critical Needs Projects.

The Master Plan continues to recommend the implementation of Neighborhood Improvement Projects (NIPs) as the only sustainable long-term solution to mitigate tidal and rainfall induced flooding. Recognizing that the implementation of NIPs will take a long time and will be costly, this Master Plan also identified and prioritized Critical Needs Projects. These are smaller projects aimed at addressing nuisance flooding to provide both beneficial and cost-effective solutions within targeted areas that currently suffer from recurring flooding. These projects are intended to be complimentary and adaptable to the future Neighborhood Improvement Projects.

This Master Plan incorporated the following prior studies:

• Neighborhood Project Prioritization (2020)
• Blue-Green Stormwater Infrastructure Concept Plan (2020)
• Road Elevation Strategy (2020)
• Stormwater Facilities Plan (2019)
• Seawall Prioritization Plan (2020)
• Basin Drainage Reports for the Flood Mitigation Study (2019)
• Stormwater 20-Year Needs Analysis (HB 53, 2022)
• Sea Level Rise Vulnerability Assessment and Adaptation Plan (ongoing)

The proposed ten-year critical needs projects have an escalated total budgetary estimate of $95 million dollars (considering the proposed implementation period), as presented below:

The Stormwater Master Plan proposed ten-year implementation schedule is presented below, including ongoing and proposed projects:

The Administration continues to work on the execution of previously approved NIPs, including the following:

• Indian Creek (roadway and drainage completed; seawall construction completed; landscape improvements near completion)
• West Avenue Phase II (design/build, construction is underway)
• First Street (detailed design phase ongoing, at 60% design)
• FDOT’s Alton Road South from Michigan to 43^rd St (100% design)
• North Shore D – North Beach Town Center ($10 M grant agreement for design was executed, preliminary design is underway).

The total estimated budgetary cost for the Prioritized Neighborhood Improvement Projects is $3.7 billion dollars (in 2024 dollars, excluding FDOT right-of-way). The $3.7 billion dollar budgetary estimate includes the implementation of blue-green infrastructure and water quality treatment systems. Additionally, the Administration continues to implement previously approved and already budgeted water quality improvement projects.

City staff alongside the engineering consultant will present the Final Stormwater Modeling and Master Plan Update. The presentation slides are enclosed for reference.