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LTC 268-2012 Status of the Stormwater Management Master Plan r MIA/\Al BEACH REMFIVFn OFFICE OF THE CITY MANAGER 2012 OCT 17 PN 4: 45 LET� E.R T� � .MM K r'k 0 0, IS I S -SION----- ------ TO: Mayor Matti Herrera Bower and Members of the City Commission 268-2012 FROM: Kathie G. Brooks, Interim City Manager s DATE: October 17, 2012 SUBJECT: Status of the Stormwater Management Master Plan The purpose of this LTC is to inform you of the status of the draft 2011 Stormwater Management Master Plan (SWMMP) with a summary of the public hearing held on August 17, 2012. We intend to schedule individual meetings with the Mayor and Commissioners to discuss the SWMMP and its implications. BACKGROUND The City of Miami Beach is one of 16 municipalities that entered into an Interlocal Agreement with Miami-Dade County in 1993, authorizing Miami-Dade County to be the lead permittee in submitting a National Pollutant Discharge Elimination System (NPDES) Stormwater Permit Application. (There are now 33 municipalities that are party to the Interlocal Agreement.) One condition of the Interlocal Agreement requires Miami Beach to develop a SWMMP that is consistent with Miami-Dade County's Master Plan. In 1997, the City prepared a SWMMP that prioritized drainage basins, recommended a five-year Capital Improvements Program, and provided hydrologic and water quality calculations for the priority basins. The 1997 SWMMP determined stormwater infrastructure needs based on water quality, flooding potential, City staff rankings, and complaints. The basins ranked the highest were made priority basins and received funding for stormwater improvements. Non-priority basins received no funding. The 1997 SWMMP has proven to be out-of-date as a result of changes in land use, modifications to the contributing watersheds as a result of re-grading and new construction, and sea level rise. Further, it did not provide a citywide model that could provide the data needed to plan comprehensive Citywide stormwater infrastructure improvements. At its June 9, 2010 meeting, the City Commission, via Resolution No. 2010-27422, authorized Camp Dresser & McKee (now CDM Smith) to prepare a new SWMMP. This plan is now complete (Attachment A). ANALYSIS The new SWMMP project has created a comprehensive, citywide model, using more powerful software than was available in 1997 that evaluates the existing system using survey data and Light Detection and Ranging (LIDAR) technology, simulates inter-basin flows, and identifies those basins that are experiencing a reduced level of service. Improvements are identified in a schematic fashion that provides one cohesive design for the City. The SWMMP also accounts for climate change and sea level rise. The consultant made use of a variety of published resources and analyzed historic sea level data. In particular, the consultant used data from the National Oceanic and Atmospheric Administration to determine Status of the Stormwater Management Master Plan September 24, 2012 Page 2 of 3 . the existing mean high water (MHW) and projections from the Army Corps of Engineers (ACOE) to estimate historical, intermediate, and high rates of sea level rise. The consultant is basing its design recommendations on the ACOE intermediate projection for sea level rise over the next 20 years. The ACOE modified the equations for its curves in 2011. As a result, for all new projects, a sea level elevation of 0.67 feet NAVD88 (based upon the ACOE intermediate curve) is being used for stormwater design purposes and an elevation of 3.2 feet NAVD88 (a vertical control datum established in 1991 used to define elevations) is being used as a minimum for seawall elevations. The previous design criterion required by the City was 0.04 feet NAVD88 for sea level elevation. There was no minimum seawall elevation. The model has also been used to provide concurrency reviews of recently bid neighborhood improvement projects. These reviews have 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. The neighborhoods reviewed to date are: • Biscayne Point • Central Bayshore • Lower North Bay Road • Lake Pancoast • Sunset Islands I & II In addition, the new criteria are being used in the preparation of the following projects: • Star Island • Palm and Hibiscus Islands • Sunset Islands III & IV • Sunset Harbour • Flamingo 6th Street • 16th Street • La Gorce Further, the SWMMP has developed order of magnitude cost estimates for the improvements required that total approximately $200 million in needed infrastructure improvements. These improvements will need to be made over an estimated span of 20 years, contingent upon the rate of sea level rise. 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. 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 MHW 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 Status of the Stormwater Management Master Plan September 24,2012 Page 3 of 3 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 is calculating the additional cost of the capital improvements for a 30-year life cycle. However, it requires larger pumps in certain locations but does not change the requirements for catch basins, piping, and seawalls. 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. There was also a request to have the ACOE present the methodology it used in estimating its curves for the historical, intermediate, and high rate of anticipated sea level rise. Staff indicated that it would request the ACOE to attend another meeting at which the methodology would be-explained. 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 that the City Commission be given an update every three years of any regulatory or environmental changes that would impact the SWMMP. CONCLUSION The Administration proposes to meet individually with the Mayor and Commissioners to discuss the SWMMP and its implications. The SWMMP will then be taken to the October Commission meeting for consideration. 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 KGB/MS JJF/RWS F:\WORK\$ALL\(1)EMPLOYEE FOLDERS\Rick Saltrick\LTC's\LTC for Stormwater Management Master Plan.docx I Attachment A Executive Summary ES.1 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(ILA)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)Stormwater 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 stormwater management system flood control and water quality 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 tide levels and 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 to: 1. meet the increasing performance and regulatory demands, 2. modernize existing systems for both flood control and water quality,and r3. 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(0&M); M ES-1 KM3226 ES.docx ©2012 CDM Smith All Rights Reserved I Executive Summary • Stormwater Management Master Plan • Objective No.4:Augment existing infrastructure for storage and treatment; • 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 Stormwater 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) f • 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 VrnMi th ES-2 KM3226 ES.docx ©2012 CDM Smith All Rights Reserved Executive Summary • Stormwater Management Master Plan • Survey data collected by the CDM Smith team's topographic surveyor,Hadonne • 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 for stormwater improvements and a projected 50-year cycle for seawalls.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 cycle is projected to have a tidal mean high water condition of approximately 0.67 ft.NAVD.However,adjustment calculations have been performed for the high projections(0.84 ft.NAVD)in the instance that SLC accelerates(Figure 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. For the next 50 year planning period,a minimum seawall elevation recommendation was established based on statistical analysis of Federal Emergency Management Agency's(FEMA) 1-year tidal stillwater elevation.Per FEMA,the stillwater elevation is the maximum storm induced water surface F elevation,primarily a combination of the normal astronomic tide and the storm surge.Stillwater elevations do not include the effect of waves.To obtain the 1-year tidal elevation,regression analysis was completed the stillwater elevations published in the FEMA Flood Insurance Study(FIS)issued in September 2009.The statistical analysis determined the 1-year tidal stillwater elevation as 2.2 ft NAVD.CDM Smith developed a recommendation of a minimum seawall height of 1 foot above the 1- year tidal stillwater(1.0+2.2 ft NAVD=3.2 ft NAVD). Since the 1-year stillwater is based on statistical analysis rather than tidal data from the Virginia Key gage,CDM Smith correlated the recommended minimum sea wall height to the mean higher high water(MHHW)information used in the evaluation of the stormwater recommendations.The USACE- based sensitivity analysis was applied to determine where the current MHHW tide conditions relate to the recommended seawall height over the next 50-years.(Figure 2). The MHHW tide conditions normally observed in Miami Beach during the months of April and October (spring tides)relate to the annualized MHHW data recorded from the Virginia Key gage.The current, Year 2009,annualized MHHW elevation is 1.6 ft NAVD.For consistency in the analysis of SLC,CDM Smith recommends that projections be referenced to the same data source,in this instance,tidal records from Virginia Key. This analysis considers the establishment of seawall elevations to protect against normal tidal conditions.The recommended minimum height does not provide protection against extreme tidal events,which may coincide with hurricanes and other natural disasters. PM ES-3 KM3226 ES.docx ©2012 CDM Smith All Rights Reserved A 4) vn a x w L N m N c /^I �` I �♦ I ~ ril 0 C `` i %% Ln a % 0 v `% ♦ , to M C O `♦ ♦♦ 5 Ln ra N N 4) O' �♦ N O y v M I ♦ ♦ J c*a `i♦ ♦` ; Lw E- E �' o +; `♦ %♦ CL• to `` N b� I % N x ♦ % l I i ` C E x ` % ul °' 'Q ♦♦ po ♦ ` % Ln w v O ci v w N i ♦`♦ 1 a .0 ,% C 0 4-0 `♦ O C I H O Ni rTr t H LM Y N 8 d t0 � N } N _ � .O ei i X00 Q1 �r m e.1 rn N r•i i v W i N l0 Q Z 3 V U b i LM uj au t i C O .-, ww 0�C Y z �. Z Z Z m W W W Ln Q Q Q M p V W � � o� u ; o ,m o 01 00 i- z 111 it M N e-1 O W z C O O C O ./ G O O (GAVN 4)jeteM 421H ueayy Y N U? CL O O w x Q) N co n t� � d' 00 1 cV N ttA •.. � o IM I N I N G� •bA ovc 1 1 1 Ln LO V) 1 1 N Ln E a 1 1 1 1 3 N ,� i Ln E M ri 1 1 tw Ln 1 1 U 1 1 N w 1 1 1 1 N 1 1 1 i N 1 1 i Ln �. Ln 1, 1 1 ° '�• 1 w ; 1 1 C) � ` : 1 1 1 N V 1 i 1 bA ' 1 1 i ' M Ln '" N 1 1 N w 1 1 1 3 ° � O N cC 111 V V V a 111 z z z N 111 111 � N � LO ju O oix r-I V 0 O 'l L00 Ln M Ln N Ln r-1 Ln C:) W N M O O a UAVN:3)laWAi 01H UBOW m Y Executive Summary • Stormwater Management Master Plan As a complement to the engineering evaluation,CDM Smith utilized the FEMA's 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-5-year storm(5.9 inches of rainfall in 24 hours). ESA 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 stormwater 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.5 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: • Data Management • Stormwater Models and Future Condition Analysis - In recognition of SLC,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 0.67 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. i th ES-6 KM3226 ES.docx ©2012 CDM Smith All Rights Reserved Executive Summary • Stormwater Management Master Plan • Seawall Height Considerations - In recognition of SLC,statistical analysis of the 1-year stillwater elevation,and spring tides 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 MHHW tidal elevations. • Pump Station 0&M • Storage Facility Standards and 0&M • Outfalls/Backflow Preventer Standards and 0&M • Recharge Well Standards and 0&M • Swales 0&M • Exfiltration Trench 0&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 proposed infrastructure improvements.Due to the anticipated significant capital investment and stringent permitting to discharge into Biscayne Bay,the tiered approach will 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 FEMA 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 0&M,policies,and standards for existing and future conditions. 01th ES-7 KM3226 ES.doa ©2012 CDM Smith All Rights Reserved Executive Summary • Stormwater Management Master Plan 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 0.67 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$10 million to account for the potential phenomena of accelerated sea-level rise(up to 0.84 ft NAVD mean high tidal conditions) (high scenario),and subsequent additional stormwater facility needs.CDM Smith also reviewed 0&M costs associated within these identified capital projects.Table ES-1 shows the locations,timeframes and capital costs of the proposed projects. Table ES-1 City of Miami Beach Stormwater Management Master Plan Capital Costs(in Million$) 0-5 Years 5-10 Years 10-15 Years 15-20 Years Total Biscayne Point 11 11 North Shore 7 7 North Shore(72"d Street) 10 10 Normandy Isle 20 20 I Upper La Gorce* 11 1 12 I Lower La Gorce* 12 2 14 i La Gorce Island/Allison Island 9 9 i Oceanfront 0.3 0.3 Nautilus 4 4 Sunset Island 3 and 4* 3 3 Flamingo/West Avenue 47 59 106 Subtotal 62 27 30.3 55 196.3 Adjustment for higher sea-level rise 2 4 4 10 Total 62 29 34.3 81 206.3 *Under design 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. th ES-8 KM3226 ES.docx ©2012 CDM Smith All Rights Reserved Executive Summary • Stormwater Management Master Plan 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 rainfall related flooding,sea-level rise,water quality of Biscayne Bay,and 0&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.The$196 million CIP quantifies the economic requirements to meet LOS and water quality requirements. Increasing the CIP to$206 million provides a financial adjustment to accommodate higher SLC projections over the 20-year time frame; • Objective Number 2:Quantify economic impact of flooding; - SWMMP Solution:FEMA 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 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 0&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 Stormwater 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 to manage flooding,protect and improve water quality,increase recharge,and provide potential water for irrigation; • 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; PM ES-9 KM3226 ES.doa ©2012 CDM Smith All Rights Reserved Executive Summary • Stormwater Management Master Plan • 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 Stormwater 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.A recommendation of a minimum seawall height of 3.2 ft NAVD provides a means to protect against projected spring tidal conditions over the next 50 years,based on intermediate SLC projections. 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." i VOth ES-10 KM3226 ES.docx ©2012 CDM Smith All Rights Reserved T PO Q w U N = Q U U r I l�rl�rlr;rl 4-) Q �e m Z m Z '"' i i KiI ii llil i i i 4 I }glii��erlj' W W Q W Q W o _ tY S Z LL z 5 ° o LL Q � Q U a ° `E E aE 6ao E ' E U E � Q E-c." 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