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C7Q-Retroactively Approve Additional Service Agmt Stormwater Management Master PCOMMISSION ITEM SUMMARY Condensed Title: A Resolution Of The Mayor And City Commission Of The City Of Miami Beach, Florida, Retroactively Approving An Additional Service Agreement With COM-Smith For Work On The Stormwater Management Master Plan Relative To Neighborhood Concurrency Reviews, A Public Meeting, And Additional Model Runs Requested As A Result Of That Meeting. Key Intended Outcome Supported: Supporting Data (Surveys, Environmental Scan, etc.): Per the 2011 Strategic Plan update, only 44% of residents and 45% of businesses rated storm drainage as excellent or good. Issue: I Shall the Mayor and the City Commission approve the Resolution? Item Summary/Recommendation: Per the base scope of services, the consultant created a comprehensive, citywide model of the stormwater infrastructure, identified those basins that are experiencing a reduced level of service, projected sea level rise in order to provide minimum stormwater design criteria, and developed order of magnitude cost estimates for the improvements. Outside the base scope of services, the consultant also used the model to provide concurrency reviews of ten neighborhood improvement projects. These reviews prompted changes to the stormwater designs of the neighborhoods due to inter-basin flows. As a result, the neighborhood improvements will be more effective in providing the required LOS and more flexible to account for the uncertainty relative to the rate of sea level rise. At the June 28, 2012 Finance and Citywide Projects Committee, there was a technical discussion on the existing mean high water and the rate of sea level rise. As a result, the Committee directed staff to have a public discussion on sea level rise and to return with the results. This public discussion was not included in the base scope of services. At the public discussion, it was questioned why the consultant developed a master plan with a 20-year horizon instead of a 30-year or 50-year horizon. At the August 22, 2012 Finance and Citywide Projects Committee, staff presented the results of the public discussion and an analysis of the costs differences between a 20-year planning horizon and a 30-year planning horizon. The Committee approved the plan with the recommendation to use a 20-year planning horizon. The consultant requested additional compensation for the concurrency reviews, the presentation, and the 30-year planning horizon. City staff has negotiated what it believes is fair and reasonable compensation based upon the work performed -paying for additional services but not paying for additional work required to more fully explain or justify analyses conducted under the base scope of services-with a total cost of $57,804. THE ADMINISTRATION RECOMMENDS ADOPTING THE RESOLUTION. Advisory Board Recommendation: I Approval by FCWPC Financial Information: ~~~--,---~A~m~o~u~ntt--~r-------lAr.c;c;o~u~n~t--------r-~~;r;o~v~e~d~l 1 $57,804 431-2730-069357 Department Director Assistan er ETC M MIAMI BEACH 348 AGENDA ITEM ___::::::(;.....::7--=Q~­ DATE 7-/l-/3 ~ MIAMI BEACH City of Miami Beach, 1700 Convention Center Drive, Miami Beach, Florida 33139, www.miamibeachfl.gov COMMISSION MEMORANDUM TO: Mayor Matti Herrera Bower and M FROM: Jimmy L. Morales, City Manager DATE: July17,2013 SUBJECT: A RESOLUTION OF THE MAYO AND CITY COMMISSION OF THE CITY OF MIAMI BEACH, FLORIDA, RET OACTIVEL Y APPROVING AN ADDITIONAL SERVICE AGREEMENT WITH COM-SMITH FOR WORK ON THE STORMWATER MANAGEMENT MASTER PLAN RELATIVE TO NEIGHBORHOOD CONCURRENCY REVIEWS, A PUBLIC MEETING, AND ADDITIONAL MODEL RUNS REQUESTED AS A RESULT OF THAT MEETING. ADMINISTRATION RECOMMENDATION The Administration recommends adopting the resolution. FUNDING Funding is available in the 2011 Stormwater Bonds Fund (431-2730-069357) Drainage Hot Spots BACKGROUND At its June 9, 2010 meeting, the City Commission, via Resolution No. 2010-27422, authorized Camp Dresser & McKee (now COM-Smith) to prepare a new Stormwater Management Master Plan (SWMMP). At its November 14, 2012 meeting, the City Commission, via Resolution No. 2010-27422, adopted the SWMMP (Attachment A is the Executive Summary for the Plan). Per the base scope of services, the consultant created a comprehensive, citywide model of the stormwater infrastructure, identified those basins that are experiencing a reduced level of service, projected sea level rise in order to provide minimum stormwater design criteria, and developed order of magnitude cost estimates for the improvements. ANALYSIS Outside the base scope of services, the consultant used the model to provide concurrency reviews of ten neighborhood improvement projects. These reviews prompted changes to the stormwater designs of the neighborhoods due to inter-basin flows. As a result, the neighborhood improvements will be more effective in providing the required LOS and more flexible to account for the uncertainty relative to the rate of sea level rise. At the June 28, 2012 Finance and Citywide Projects Committee, there was a technical discussion on the existing mean high water and the rate of sea level rise. As a result, the Committee directed staff to have a public discussion on sea level rise and to return with the 349 Citywide Storm water Management Master Plan July 17, 2013 Page 2 of3 results. This public discussion was not included in the base scope of services. This SWMMP Sea Level Rise Discussion was held on Friday, August 17, 2012. The presentation (Attachment B) began with a discussion contrasting the City's previous SWMMP to the new SWMMP. The presentation then focused on sea level rise and the reports and data available to estimate mean high water and the rate of sea level rise. Following this, the consultant discussed how sea level rise was incorporated into the draft SWMMP and into the recommended capital improvements. It was stressed that there is a large degree of uncertainty with the rate of sea level rise. As a result, the City has developed a flexible capital improvement plan that can accommodate various rates of sea level rise. The capital improvements will rely on backflow preventers at the outfalls, more pump stations, raised seawalls, and stormwater storage. The City will need to monitor the rate of sea level rise and adjust the plan accordingly. As sea level rises, the stormwater system will rely more upon pumps, and as the existing pumps age, they will be replaced with larger pumps. The presentation was generally positive with acknowledgement that the City is in the forefront of developing a capital program to address sea level rise projections. There were also some concerns expressed about the SWMMP. It was questioned why the consultant developed a master plan with a 20-year horizon instead of a 30-year or 50-year horizon. It was explained that the life cycle of a pump is approximately 20 years. After 20 years, a pump that has reached the end of its life cycle could be replaced with a larger pump depending on the rate of sea level rise. The consultant calculated the additional cost of the capital improvements for a 30-year time frame. While it requires larger pumps in certain locations, the 30-year time frame does not change the requirements for catch basins, piping, and seawalls and the difference in cost was $10 million. There were also questions about the ability of the City to deal with sea level rise beyond the 20-year or 50-year horizons. It was stressed that the SWMMP provides flexibility beyond the time horizons discussed. At the August 22, 2012 Finance and Citywide Projects Committee, staff presented the results of the Discussion (Attachment C) and an analysis of the costs differences between a 20-year planning horizon and a 30-year planning horizon. The Committee approved the plan with the recommendation to use a 20-year planning horizon and not the 30-year planning horizon. The consultant has indicated that the work required for the presentation and required to develop a 30-year planning horizon was also outside the base scope of its services. City staff has negotiated what it believes is fair and reasonable compensation based upon the work performed: paying for additional services but not paying for additional work required to more fully explain or justify analyses conducted under the base scope of services. Staff believes that it is appropriate to pay an additional: $24,690 for concurrency reviews of ten neighborhood improvement projects $25,935 for the planning and presentation of the August 17, 2012 public meeting $ 3,854 for stormwater modeling at the 30-year planning horizon $ 3.325 for estimating the difference in costs at the 30-year planning horizon $57,804 total in additional services 350 Citywide Storm water Management Master Plan July 17, 2013 Page 3 of3 Staff did not agree to pay for certain items requested by the consultant that included coordination with the Army Corps of Engineers and additional modeling and cost estimating at the 20-year planning horizon, which were judged to be part of the base scope of services. CONCLUSION The Administration recommends that the Mayor and City Commission adopt the resolution. Attachments: A. Stormwater Management Master Plan -Executive Summary B. SWMMP Sea Level Rise Workshop Presentation C. August 22, 2012 Finance and Citywide Projects Committee Presentation MT/E~JJF/~ T:\AGENDA\2013\July 17\Stormwater Management Master Plan-MEM01.docx 351 Attachment A Executive Summary ES.l Introduction and Background On June 9, 2010, the City of Miami Beach (City) authorized CDM Smith Inc. (CDM Smith) to develop a City-wide Comprehensive Stormwater Management Master Plan (SWMMP) in order to evaluate and update its stormwater management practices, infrastructure, funding, and regulatory policies. Miami Beach is one of 16 municipalities that entered into an Interlocal Agreement (I LA) with Miami- Dade County in 1993 (subsequently 17 additional municipalities have also entered an ILA with Miami- Dade County), authorizing Miami-Dade County to be the lead permittee in submitting a National Pollutant Discharge Elimination System (NPDES) Storm water Permit Application, which was required by federal law. One condition of the ILA requires the City of Miami Beach to develop a SWMMP that is consistent with Miami-Dade County's Master Plan. This report is the update and expansion of the SWMMP. The SWMMP is intended to be a guide for improving the City's storm water management system performance for the next 20 years, with considerations of potential sea level change (SLC) over 20- years of stormwater infrastructure and a 50-year planning horizon for sea wall heights. SLC, to the extent it occurs, will worsen flooding potential in the City by raising the water table and by making it more difficult to discharge stormwater out of the area. The SWMMP provides a preliminary schedule of prioritized capital improvements necessary to allow the City's stormwater systems: 1. to meet the increasing performance and regulatory demands 2. to modernize existing systems for both flood control and water quality 3. to maintain the City-desired flood control level of service (LOS). The City is a highly urbanized coastal community located in southeast Florida and is a major economic resource to the region. Bounded by the Atlantic Ocean and the environmentally sensitive Biscayne Bay Aquatic Preserve, which is also an Outstanding Florida Water (OFW) requiring strict environmental protection, the study area covers approximately 4,200 acres. The area has relatively low-lying land that is intersected by intracoastal waterways with limited natural storage and large areas of re- development. The subtropical climate entails high-intensity rainfall and significant tidal influence. These factors all contribute to historical and potential future severe rainfall and tidal flooding. ES.2 Program Goals and Objectives Specific objectives of the SWMMP were defined through the initial project meetings to identify adaptable and sustainable stormwater management solutions that: • Objective No.1: Quantify and improve flood control LOS, that is, the degree of flood protection achieved, based on a 20-year capital improvement program; • Objective Number 2: Quantify economic impact of flooding; • Objective No.3: Facilitate and prioritize operation and maintenance (O&M); • Objective No.4: Augment existing infrastructure for storage and treatment; .th KM.3226.ES.docx © 2012 CDM Smith All Rights Reserved 352 ES-1 Executive Summary " Stormwater Management Master Plan • Objective No.5: Coordinate and guide review of projects under current design/construction and facilitate accelerated analysis of "early out" projects; • Objective No.6: Identify stormwater harvesting-reuse and recharge well opportunities for conservation of fresh water; • Objective No.7: Refine and recommend updates to the City's stormwater ordinances and assess sufficiency of the City's Storm water Utility; and • Objective No. 8: Provide recommendations for seawalls to mitigate the effects of sea level increases over the next 50 years. ES.3 Methodology As part of this SWMMP, surface water modeling was performed using the EPA Stormwater Management Model (SWMM) to estimate and evaluate existing flooding LOS and alternative solutions to meet refined LOS targets. Water quality evaluations were conducted using the CDM Smith Watershed Management Model (WMM). These tools can be used to support design and implementation. Model development came from a multitude of resources. The following is a list of some of the data sources: • Actual rainfall data collected from rain gages throughout the City and at Miami International Airport • Design storms as defined by SFWMD and other methodologies (i.e. FDOT) • South Florida Water Management District (SFWMD) and City land use plans • Subsurface and geotechnical information obtained from the Natural Resources Conservation Service (NRCS) and projects under design by other consultants for the CIP Office • Mean high tide elevations at Virginia Key collected by the National Ocean Service (NOS) which is a branch of the National Oceanic and Atmospheric Administration (NOAA) • Miami-Dade County and privately sourced aerial mapping of the City • Light Detection and Ranging (LiDAR) data from SFWMD • LiDAR data from Miami-Dade County • Models developed by other consultants for projects currently under construction or with construction completed for the City's CIP Office and the Florida Department of Transportation (FDOT) • Basis of Design Reports and design plans developed by other consultants for FDOT and projects currently under construction or with construction completed for the City's CIP Office • Construction record drawings for construction completed for the City's CIP Office • Survey data collected by the CDM Smith team's topographic surveyor, Hadonne Cf.A'Ith KM32'?.6,[5,do01 © 2012 CDM Smith All Rights Reserved 353 ES-2 Executive Summary " Stormwater Management Master Plan • Neighborhood surveys developed by the City • Geographic Information System (GIS) coverages of the City, which are maintained by the City's Information Management System (IMS) CDM Smith used the United States Army Corps of Engineers (USACE) guidance document (Engineering Circular 1165-2-212: Sea-Level Change Consideration for Civil Works Programs) for incorporating the direct and indirect effects of projected future sea level change (SLC) across a projected 20-year project life cycle. The USACE guidance document presents an approach for planning studies and engineering design for evaluating a range of possible future rates of SLC, represented as three equation-based scenarios (or curves): low, intermediate and high. CDM Smith performed sensitivity analysis by evaluating the three scenarios to maximize the benefits of the recommendations under varied degrees of potential future SLC. Evaluation of LOS performance and adaptability of the SWMMP-recommended system are based on the intermediate scenario (curve), which based on the 20-year life cyde is projected to have a tidal mean high water condition of approximately 0.6 7 ft. NA VD. However, adjustment calculations have been performed for the high projections (0.84 ft. NAVD) in the instance that SLC accelerates 1). This SLC sensitivity analysis included a variety of mean high tide elevation predictions over the next 20 years in combination with SFWMD defined design storm events. As a complement to the engineering evaluation, CDM Smith utilized the Federal Emergency Management Agency's (FEMA) Hazards United States (HAZUS) tool designed to estimate hazard- induced losses for use by federal, state, regional and local governments, and private enterprises in planning for risk mitigation, emergency preparedness, response and recovery. By using a standard FEMA tool, the City will benefit in the coordination of future activities related to flood proofing, grant assistance, and management of repetitive loss properties. The analysis, which was performed for South Beach, incorporated existing elevations, structure and land use data along with information from the detailed flood model (SWMM). The HAZUS model generates an output that consists of a damage amount in dollars that is based on the percentage of total value loss a structure incurs during a flood event, like the statistically calculated once-in-S-year storm (5.9 inches of rainfall in 24 hours). ES.4 Level of Service The primary purposes of LOS criteria are to protect public safety and property. Program goals are to maintain passable roads for emergency and evacuation traffic during 5.9 inches of rainfall in 24 hours and to keep flood stages below the first floors of homes and buildings. The LOS criteria were first used to identify and define potential problem areas using the storm water model developed for this study. The LOS criteria were then used to evaluate the effectiveness of contemplated improvements. LOS achievement decisions directly affected the size and cost of proposed improvement alternatives. ES.S Basis of Proposed Improvements and Recommendations CDM Smith developed recommendations and proposed modifications to language included in the City's Public Works Manual, City ordinances, and policy documents. Implementation of these modifications should be coordinated with the various City Departments including Public Works, CIP, Planning, City Attorney, Finance, Budget and Performance Improvement, and the City Manager's Office. Recommendations were made based on the following major categories: .lh KM32.26.E5.dOCl( © 2012 CDM Smith All Rights Reserved ES-3 354 w CJ'I CJ'I Executive Summary " Stormwater Management Master Plan USACE curves are based on the Engineering Circular EC •nuc:n ... .., on October 1, 2011 and 2013. 0.9 = ,._ = USACE NRC Curve I (low) 0.8 ----USACE NRC Curve!! {Intermediate} "'"'""*"'"*"'"'~·"'· _ = wJ!itw * USACE NRC Curve Ill {High) 0.7 £o.s .. Cll ~ -c: m CD :IE 0.3 0.2 0.1 0 1980 .th KM32.26,ES,dca © 2012 CDM Smith All Rights Reserved Key Tidal Data lUG Nflft.A 1985 1990 1995 Annual! zed NOAA Data 2000 2005 Year 2010 1015 Historic and Mean 1020 2025 2030 Water Levels at Virtrlni ES-4 Executive Surnrnary " Storrnwater Management Master Plan • Data Management • Stormwater Models and Future Condition Analysis In recognition of tidal conditions for future modeling efforts should utilize tidal boundary conditions as defined by the latest version of the SWMMP. This version of the SWMMP recommends a tidal boundary condition of 0.6 7 ft. NAVD. It is based on USACE guidance intermediate scenario projections for SLC based on a current day (Year 2009) mean high water elevation at 0.29 ft. NAVD and a projected Year 2030 mean high water elevation at 0.67 ft. NAVD (See Figure 1). • Stormwater Harvesting and Reuse • Sea-Level Rise Considerations The SWMMP recommends the City monitor SLC phenomena and possibly participate with local and regional climate change advisory committees regarding regional recommendations related to SLC. • Seawall Height Considerations In recognition of SLC and seasonal (Fall and Spring) annualized mean higher high tidal elevations of 1.6 ft. NAVD (Year 2009). The SWMMP recommends based on the USACE guidance intermediate scenario, the establishment of a minimum seawall height of 3.2 ft. NAVD, which provides greater than 50 years of sea wall protection against future mean higher high tidal elevations. • Pump Station O&M • Storage Facility Standards and O&M • Outfalls/Backflow Preventer Standards and O&M • Recharge Well Standards and O&M • Swales O&M • Exfiltration Trench O&M • 100-Year Floodplain Storage • Stormwater Design Standards ES.6 Proposed Improvements and Project Coordination Evaluations were performed for project areas to determine the level of infrastructure improvements necessary to meet the LOS for the statistically calculated once-in-5-year storm LOS. A tiered Best Management Practice (BMP) treatment train approach was used to identify the most effective solutions for each project area and to identify opportunities for flood control, water quality, aquifer recharge, and stormwater harvesting and irrigation use. The tiered approaches were incrementally formulated from the simplest tier 1 (e.g., back flow preventers) through the most complex and costly tier 4 (e.g., underground storage), and bundled together to determine the economic feasibility of © 2012 CDM Smith All Rights Reserved 356 ES-5 Executive Summary " Stormwater Management Master Plan proposed infrastructure improvements. Due to the anticipated significant capital investment and stringent permitting to discharge into Biscayne Bay, the tiered approach should allow the City to proceed with specific elements of the BMP treatment train as economic conditions permit. This would allow for future addition of tiers to ultimately meet the full 5-year LOS while monitoring and adjusting to sea-level rise conditions. ES.7 Project Ranking and Recommendations The results of the flood damage analysis using the HAZUS tool showed that the existing topographic conditions in Miami Beach have significant potential economic losses associated with flood events, for both rainfall-induced and tidally-induced events with the implementation of a Capital Improvement Program (CIP). A prioritized stormwater CIP list based on the ongoing projects and problem areas identified in the SWMMP was developed. In addition, CDM Smith provided recommendations regarding overall stormwater management needs to achieve better O&M, policies, and standards for existing and future conditions. Three project categories have been identified: • Early Out (Near-Term Implementation) Projects and Currently Scheduled CIP Projects; • Concurrency-Reviewed (Review of Projects Currently Under Final Design and Construction) CIP Projects; and • SWMMP-Identified Projects. CDM Smith recommends approximately $196 million in capital improvements (based on 0.5 ft NAVD (low scenario) to 0.6 7 NAVD (intermediate scenario) mean high water tidal conditions) proposed for the City's primary stormwater management system. CDM Smith has incorporated an additional sea- level rise adjustment of approximately $10 million to account for the potential phenomena of accelerated sea-level rise (up to 0.84 ft NAVD mean high tidal conditions) (high scenario), and subsequent additional stormwater facility needs. CDM Smith also reviewed O&M costs associated within these identified capital projects. Table ES-1 shows the locations, timeframes and capital costs of the proposed projects. Trmth KM3226.ESdocx © 2012 CDM Smith All Rights Reserved ES-6 357 Executive Summary " Stormwater Management Master Plan Table ES-1 City of Miami Beach Stormwater Costs (in Million$) 0-5 Years 5-10 Years 10-15 Years 15-20 Years Total Biscayne Point North Shore North Shore (72"d Street) Normandy Isle Upper La Gorce* Lower La Gorce* La Gorce Island/Allison Island Oceanfront Nautilus Sunset Island 3 and 4* Flamingo/West Avenue 47 Subtotal 62 Adjustment for higher sea-level rise Total 62 •under design 11 7 10 20 1 2 4 59 27 30.3 55 2 29 11 7 10 20 12 14 9 0.3 4 3 106 196.3 10 206.3 The CIP was also evaluated both technically (SLC) and financially (capital cost) based on a 30-year planning horizon. However, given the design life of the pumping components and CDM Smith's experience in the development of other SWMMP, it was concluded that a 20-year planning cycle was appropriate with continued monitoring of SLC in shorter time increments. The financial analysis of the City's Stormwater Utility shows that it will require additional funding to finance the construction of recommended CIP projects and to operate and maintain the system over the next 20 years. ES.8 Conclusions The submitted SWMMP provides comprehensive recommendations for improving the City's stormwater management system performance for the next 20 years. Appropriate consideration has been given to potential sea-level rise, water quality of Biscayne Bay, and O&M of an expanded system. The presented capital improvements allow the City's stormwater systems to be flexible and adaptable in meeting the increasing LOS performance targets and regulatory demands. Specific objectives were defined through the initial project meetings, including the following; the means by which the SWMMP addresses them are also noted. • Objective Number 1: Quantify and improve flood control LOS based on a 20-year capital improvement program; SWMMP Solution: A comprehensive 20-year CIP was developed quantifying improvements to flood control LOS with flexibility to adapt to varying degrees of SLC; • Objective Number 2: Quantify economic impact of flooding; •• h KM32t.6.E5,doo: SWMMP Solution: HAZUS evaluation documents the economic impact of flooding on the region of the City that generates the majority of the City's tourism revenue. The $196 © 2012 COM Smith All Rights Reserved 358 ES-7 Executive Summary "' Stormwater Management Master Plan million CIP quantifies the economic requirements to meet LOS. Increasing the CIP to $206 million provides a financial adjustment to accommodate higher SLC projections; • Objective Number 3: Facilitate and prioritize O&M; SWMMP Solution: Refinements and expansion of current O&M practices have been evaluated with a projected cost as part of the development of recommendations. These considerations are included in projected future funding of the City's Storm water Utility; • Objective Number 4: Augment existing infrastructure for storage and treatment; SWMMP solution: The BMP Treatment train tiered solutions augment the existing infrastructure with storage and treatment solutions; • Objective Number 5: Coordinate and guide review of projects under current design/construction and facilitate accelerated analysis of "early out" projects; SWMMP solution: Early out projects have been developed and concurrency reviews have been performed to guide the development of stormwater solutions under construction that are consistent with the SWMMP; • Objective Number 6: Identify stormwater harvesting-reuse and recharge well opportunities for conservation of fresh water; SWMMP solution: Tier 1 through Tier 4 BMP Treatment Train recommendations recharge the Biscayne Aquifer under the City while developing storage solutions that promote irrigation and reuse of treated stormwater; • Objective Number 7: Refine and recommend updates to the City's stormwater ordinances and assess sufficiency of the City's Stormwater Utility; SWMMP Solution: Recommendations to refine ordinances and policies including those related to SLC are proposed while identifying the long-term revenue sufficiency of the Storm water Utility; " Objective Number 8: Provide recommendations for seawalls to mitigate the effects of sea level increases over the 50 years; SWMMP Solution: Preliminary inspection and elevation standards for seawalls have been made with consideration of SLC, based on USACE guidance documents. The presented SWMMP addresses the objectives defined at the initiation of the project. The developed solutions are consistent with the project statement defined at the project kickoff meeting: "Proposed solutions are needed that are accurate, timely, effective, and defensible." ctBmth KM3226·ES docx © 2012 CDM Smith All Rights Reserved ES-8 359 360 w 0') ~ Michael F. Schmidt, P.E., BCEE • Senior Vice President for CDM Smith • Water Resources Technical Market Leader with 27 years experience on +80 stormwater programs across Florida • Managed /directed +160 water resource management programs Jason A. Johnson, P.E. • Senior Project Manager • Principal Water Resources Engineer • 15 years of international and domestic water resources/ stormwater management experience 362 - 363 QJ 364 365 . Q) . - u.. ~ ~ ~ ~ QJ V') L.. s..... - V') -QJ I • • - N 366 -Q) Q) 367 w 0') 00 0.9 0.8 0.7 0.6 ... 0.5 (II .... 111 3: 0.4 c: m o.3 ::\i! 0.2 0.1 0 1980 ......... USACE NRC Curve I (low) ........ USACE NRC Curve II {Intermediate) -":'fl.-USACE NRC Curve Ill ~ Key Tidal Data NOAA 1985 1990 1995 2000 USACE curves are on the Circular EC 0.84 ::7.: d 2005 2010 2015 2020 2025 2030 Year on October 1, 2011 and September 30, 2013. North Shore North Shore (72nd Street) $10 ormandy Isle $20 w I Upper laGorce I $12 0') <0 $14 -$9 -nfront I $0.3 -$4 -$3 -Flamingo+ I $106M SUBTOTAL $196M -Adjustment for highest sea I $10M level rise projection 370 w ....... ~ 11 separate steps into separate slides. keep Jason A. Johnson, 8/16/2012 then add steps in slides 372 373 374 375 --ra :J 376 ~ t ti ns . ~ B-nUnUI I p...,.nr 1-C B\IU HUnr t-t Ul n I . 51 w r o ndin I . -I I ris ....... ~ n1 ns 1n s ....... th t s h ul s t pu I i within tn t II ~ auiau1 ti ld ry fi n d t w p s . rl 378 379 380 381 382 383 USACE curves are on the Engineering Circular EC 1165-2-212, published on October 1, 2011 and 6 ~ 5.91 .... +-USACE NRC Curve I .......... USACE NRC Curve II 5 .......... USACE NRC Curve Ill Tidal Data 3.98 4 w 00 ~ ... (II rt.i 3 3: II: m (II ::?! 2 1 .. ilf!!f/l/j--f!llj!ia-OM ~% 0 1980 2000 2020 2040 2060 2080 2100 Year w 00 CJ1 During a presentation of the SWMMP at the June 28, 2012 Finance and Citywide Projects Committee, there was a technical discussion on the existing MHW and the rate of sea level rise. As a result, the Committee directed staff to have a public discussion on sea level rise and to return with the results. This SWMMP Sea Level Rise Discussion was held on Friday, August 17, 2012. I AMI ;.;. M-M-Q.l t"'l ::r' 3 ro = M-r"'l GOING FORWARD Modify stormwater system as sea level rises • install backflow preventers at outfalls • construct new stormwater pump stations w • add pumps to gravity systems 00 m • create storage for stormwater • raise seawalls to mandated heights Monitor change in sea level and refine future adaptation strategies Re-prioritize infrastructure requirements -· MIAMI w 00 ....... 72nd Street) land/Allison Island t el rise * Under design +Does not include $6M in RDA funding MIAMI BEACH 29 $50M currently funded $5M req'd additionally 206.3 RESOLUTION TO BE SUBMITTED 388 THIS PAGE INTENTIONALLY LEFT BLANK 389