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R7 C July 24 2020 Commissioners Mtg - JACOBS, ITEM R7CBlue-Green Stormwater Infrastructure, Road Elevation Strategy & Neighborhood Project Prioritization July 24, 2020 Commission Meeting BI0909191410MIA Agenda •Final results and recommendations for Commission approval •Neighborhood Project Prioritization •Road Elevation Strategy •Blue-Green Stormwater Infrastructure Concept Plan •Next Steps •Integrate blue-green infrastructure into all designs •Incorporate new road raising policy into standards •Design Criteria Packages for neighborhood projects 2 BI0909191410MIA •This presentation compiles 10 months of work on blue-green infrastructure, road raising, and neighborhood prioritization •Work performed utilized existing City studies, plans, and analyses from the past several years, which was updated and revised, as necessary •Input for this work was received from a number of sources: Public Works Dept, Managers Ready Team, public/residents, City Commission •This final work product reflects Jacobs’ recommendations 3 Introduction BI0909191410MIA Neighborhood Prioritization BI0909191410MIA •Capital projects were sourced from: •Transportation Master Plan •Water Master Plan •Sewer Master Plan •Fire Flow Projects •Water & Sewer Renewal/Replacement Report •City Capital Improvement Program •GO Bond Program •Blueways Master Plan •Additional 64 road elevation projects were developed based on updated Road Elevation Strategy •Two scenarios were evaluated: flood risk and flood risk with water and sewer 5 Rank Project Category Project Category Weight Factor (%) 1 Coastal Flood Risk Management 100 2 Potable Water Distribution / Fire Suppression System 100 3 Emergency (Critical) Facilities & Roads 90 4 Sanitary Sewer Service Delivery 85 5 Rain Driven Storm Water Management 85 6 Environmental Benefits 70 7 Economic Development 60 8 Pedestrian and Bicycle Mobility 50 9 Road Classification 40 10 Road Condition Maintenance 40 11 Aesthetics 35 Project Evaluation Categories and Weight Factors 560 City Capital Projects Were Reviewed and 401 Were Selected for Inclusion and Prioritization BI0909191410MIA Recommended Prioritization: Flood Risk with Water & Sewer* 6 •Normandy Isles A •Oceanfront A & Oceanfront B •Flamingo/Lummus C & Flamingo/ Lummus G •West Avenue and Bay Road A – already underway Location of Top 5 DCPs Recommended First 5 DCPs North West Avenue and Bay Road A *Normalized by Population Served BI0909191410MIA Road Elevation Strategy BI0909191410MIA Recommended Road Raising Strategy •Based on updated SLR projects, frequency of sunny day flooding, type of road & service life of road 8 •Edge of road: •Local and major roads: ≥ 3.9 ft •Emergency roads: ≥ 4.8 ft 4.8 ft Emergency Roads 3.9 ft for Major/Local Minimum Road Base Elevation for All Roads Using IPCC Median curve, edge of road elevation of major/minor roads would 3.3 feet (a difference of ~7 inches), which would not significantly reduce the need for harmonization and would increase flood risk, increase maintenance, decrease road service life, and increase overall costs BI0909191410MIA Road Raising Strategy: Flexibility for Harmonization Balancing Road Elevations, Driveway Slopes & Base Material* 9 Driveways –Residential and Commercial Adjacent Structures *Specific criteria established BI0909191410MIA Updated Policy Tool With New Road Elevation Policy and Updated Sea Level Rise Projections 10 •Near-Term Level of Service: Based on the recommended policy, 41 miles (23% of roads in the City) currently do not meet the required level of flood risk reduction and are priority road elevation projects for the next 5 years. •Long-Term Level of Service: As sea levels rise, more roads will need to be raised; estimated to be an additional 90 miles of road by 2050. BI0909191410MIA Blue-Green Stormwater Infrastructure Concept Plan BI0909191410MIA Blue-Green Stormwater Infrastructure Concept Plan 12 •Compendium of Miami Beach-specific practices •Benefits and limitations of blue-green infrastructure •Improve water quality in stormwater discharges to Biscayne Bay •Provide minimal flood reduction (up to 2-inch storms) •Provide social, environmental & economic co-benefits in locally relevant ways •Protect freshwater lens •Implementation of Blue-Green practices is limited in highly urbanized areas •12 key practices, 4 implementation scenarios •Decision support for applicability and planning BI0909191410MIA Blue-Green Stormwater Infrastructure Integrated Into All Relevant Planning •Recommended practices: •Bioretention (ponds/swales)/Rain Gardens •Blue-green roofs •Constructed/floating wetlands •Detention basins •Enhanced tree planters •Pumped injection •Permeable pavement •Rainwater Harvesting •Stormwater planters •Subsurface infiltration/storage •Wet ponds •Tree canopy •Implementation scenarios: residential, commercial, transportation & public spaces 13 BI0909191410MIA Consider Golf Courses for Blue-Green Implementation: THE ART OF THE POSSIBLE 14 •Retrofit: Add Blue- Green Stormwater Practices •Repurpose: Keep 9 Holes and Use More Space for Blue-Green Practices •Reimagine: 100% Blue-Green Practices with Economic Development BI0909191410MIA Community Input Was Key to Jacobs Final Recommendations •Public meetings conducted for all three workstreams •Feedback incorporated into all three work products 15 Commission Approval Will Initiate •Empower City to incorporate blue-green stormwater infrastructure practices into master planning and capital improvement programs •Incorporate new Road Elevation Policy into existing standards •Develop design criteria packages (DCPs) for 56 neighborhood projects, starting with Top 5 priorities: Flamingo/Lummus, Oceanfront and Normandy Isles BI0909191410MIA Commission Action Needed •Accept the Jacobs Engineering Miami Beach Integrated Water Management Plan and amend the City's Stormwater Master Plan, consisting of three documents: •Blue-Green Stormwater Infrastructure Concept Plan •Road Elevation Strategy and Recommended Sea Level Rise/Tidal Flood Adaptation Projects •Neighborhood Project Prioritization -Methodology and Results 16 Blue-Green Stormwater Infrastructure, Road Elevation Strategy & Neighborhood Project Prioritization July 24, 2020 Commission Meeting