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R7I-Accept Recommendation Adopt 2011 Citywide Stormwater Management Master PlanCondensed Title: Issue: COMMISSION ITEM SUMMARY ic Plan update, only 44% of residents and 45% of businesses rated storm or ood. I Shall the Mayor and the City Commission approve the Resolution? The City of Miami Beach is one of 16 municipalities that entered into an lnterlocal 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. One condition of the lnterlocal Agreement requires Miami Beach to develop a Stormwater Management Master Plan (SWMMP) that is consistent with Miami-Dade County's Master Plan. ln 1997, the City prepared a SWMMP that determined stormwater infrastructure needs based on water quality, flooding potential, City staff rankings, and complaints. The 1997 SWMMP has proven to be out-of-date as a result of changes in land use, modifications to the contributing watersheds as a result of re-grading and new construction, and sea level rise. 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 (UDAR) 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 reviewed climate change and estimates of projected 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 the existing mean high water (MHW) and projections from the Army of Engineers (ACOE) to estimate historicaL intermediate, and high rates of sea level rise. The SWMMP uses the ACOE intermediate projection for sea level rise over the next 20 years. As a result, for all new projects, a sea level elevation of 0.67 feet NAVD88 (based upon the ACOE intermediate projection of sea level rise) is being used for stormwater design purposes and an elevation of 3.2 feet NAVD88 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. (Note NAVD88 is a vertical control datum established to define elevations). At the August 22, 2012 Finance and Citywide Projects Committee meetings, staff presented the SWMMP. The Committee approved the plan with the recommendation to use a 20-year planning horizon. H 490 Account AGE NIDA n EM --'-'--'-~-­ DATE ...._.Ay__,.:w.;._....._~. = -Ml MIBE H City of Miami Beach, 1700 Convenlion Center Drive, Miomi florido 33139, COMMISSION MEMORANDUM TO: Mayor Matti Herrera Bower and Members the City Commission FROM: Kathie G. Brooks, Interim City Manager DATE: October 24, 2012 SUBJECT: A RESOLUTION OF THE MAYOR AND THE CITY COMMISSION OF THE CITY OF MIAMI BEACH, FLORIDA, ADOPTING THE 2011 CITYWIDE STORMWATER MASTER PLAN. ADMINISTRATION RECOMMENDATION The Administration recommends adopting the resolution. BACKGROUND The of Miami Beach is one of 16 municipalities that entered into an lnterlocal 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. are now 33 municipalities that are party to the lnterlocal Agreement) One condition of the lnterlocal Agreement requires Miami Beach to develop a Stormwater Management Master Plan (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 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, Resolution No. 2010-27422, authorized Camp Dresser & McKee (now COM Smith) to prepare a new SWMMP. The draft is now complete (Attachment A is the Executive Summary Plan). 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 491 Citywide Stormwater Management Master Plan October 24, 2012 Page 2 of J 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 reviewed climate change and estimates of projected sea level rise. The consultant made use of a variety of published resources and analyzed historic sea data. In particular, the consultant used data from the National Oceanic and Atmospheric Administration to determine 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 projection and an estimated sea level elevation of 0.29 feet NAVD88 as of 2009) is being used for stormwater design purposes and an elevation of 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 Ill & IV @ Sunset Harbour @ Flamingo 6th Street Ill 16th Street ® La Gorce Further, the SWMMP has developed order of magnitude cost estimates for the improvements required that total approximately $200 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. It is important to note that the difference in cost an earlier design estimate using a sea level elevation of 0.5 feet NAVD88 had a minimal cost difference to the n'"'""'"'"' sea level elevation of 0.67 feet NAVD88. At the June 28, 2012 Finance and Citywide Projects Committee, there was a technical discussion on 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. 492 Citywide Stormwater Management Master Plan October 24, 2012 Page 3of3 This SWMMP Sea Level Rise Discussion was held on Friday, August 1 2012. The presentation (Attachment B) began with a discussion contrasting the City's previous SWMMP to the new SWMMP. presentation focused on sea level rise the reports data available to estimate MHW and the rate of sea level rise. Following consultant discussed how sea level rise was incorporated into the draft SWMMP and into the recommended capital mnn·\\,IOIY\Ont"' It was stressed that there is a large degree of uncertainty the rate sea As a 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 need to monitor rate of sea level and adjust the plan accordingly. As sea level rises, stormwater system will rely more upon pumps, as the existing pumps age, they 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 a 30-year or 50-year horizon. It was explained that the life cycle of a pump is approximately years. After 20 years, a pump that reached the end of its life cycle could replaced a larger pump depending on the rate of sea level rise. The consultant calculated the additional cost of the capital improvements for a frame. While it requires larger pumps in locations, the 30-year frame does not change the requirements catch basins, piping, and seawalls and difference in cost was $10 million. There were also about the ability of the City to deal with sea level 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, presented the results the (Attachment C) and an analysis of the costs differences between a 20-year horizon and a 30-year planning horizon. The approved the plan with the recommendation use a 20-year planning horizon. recommends that the Mayor City adopt the resolution. Attachments: A. Stormwater Management Master Plan -Executive Summary B. SWMMP Sea Level Rise Workshop Presentation C. August 2012 Finance and Citywide Projects Committee Presentation KGB/MS/FHB/JJF/RWS T:\AGENDA\2012\1C-24-12\Stormwater Management Master Plan-MEMO,docx 493 RESOLUTION NO. ___ _ A RESOLUTION OF THE MAYOR AND THE CITY COMMISSION OF THE CITY OF MIAMI BEACH~ FLORIDA, ACCEPTING THE RECOMMENDATION OF THE FINANCE AND CITYWIDE PROJECTS COMMITTEE AND ADOPTING THE 2011 CITYWIDE STORMWATER MANAGEMENT MASTER PLAN. WHEREAS, the City of Miami Beach is one of 16 municipalities that entered into an lnterlocal Agreement with Miami-Dade County in 1993, authorizing the County to be the lead permittee in submitting a National Pollutant Discharge Elimination System Stormwater Permit Application; and WHEREAS, one condition of the lnterlocal Agreement requires the City to develop a Stormwater Management Master Plan (SWMMP) that is consistent with Miami-Dade County's Master Plan; and WHEREAS, 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; and WHEREAS, the 1997 SWMMP needs to be updated as a result of changes in land use, modifications to the contributing watersheds, and sea level rise; and WHEREAS, at its June 9, 2010 meeting, the City Commission, via Resolution No. 2010- 27422, authorized the City's consultant, Camp Dresser & McKee (now CDM Smith), to prepare a new SWMMP; and WHEREAS, the SWMMP accounts for climate change and sea level rise; and WHEREAS, the new SWMMP establishes a comprehensive, Citywide model that simulates inter-basin flows and identifies those basins that are experiencing a reduced level of service; and WHEREAS, a SWMMP Sea Level Rise Discussion {the Discussion) was held on August 17, 2012, and included a discussion contrasting the previous SWMMP to the new proposed SWMMP; and WHEREAS, at the August 2012 Finance and Citywide Projects Committee, following a presentation by City staff on the results of the Discussion, and an analysis of the costs differences between a 20-year planning horizon and a 30-year planning horizon, the Committee recommended approval of the new SWMMP, with the recommendation to use a 20-year planning horizon. 494 NOW, THEREFORE, BE IT RESOLVED BY THE MAYOR AND CITY COMMISSION OF THE CITY OF MIAMI BEACH, FLORIDA, that the Mayor and City Commission hereby accept the recommendation of the Finance and Citywide Projects Committee and adopt the 2011 Citywide Stormwater Management Master Plan. PASSED and ADOPTED this 241h day of October, 2012. ATTEST: Matti Herrera Bower, Mayor Rafael Granado, City Clerk T:\AGENDA\2012\ 1 0-24-12\Stormwater Management Master Plan-RESO.docx 495 Attachment A Executive Summa .11 u on and c und On June 9, the of Miami Beach (City) authorized COM Smith lnc (COM Smith) to develop a Comprehensive Stormwater Management Master Plan (SWMMP) in order to evaluate and update its stormwater infrastructure, funding, and Miami Beach is one of 16 that entered into an lnterlocal with Miami- Dade Dade 17 additional have also entered an ILA with Miami- to be the lead a National Elimination System Stormwater Permit which was required federal law. One condition of the ILA the City of Miami Beach to MmM•·-·" a SWMMP that is consistent with Miami-Dade Master Plan. This report is the and of the SWMMP. The SWMMP is intended to be a guide for the storm water management system flood for the next 20 years, with considerations of potential sea level over of storm water infrastructure and a 50-year horizon for sea wall to the extent it occurs, will worsen flooding in the raising the tide levels and water table and making it more difficult to stormwater out of the area. The SWMMP provides a schedule of stormwater meet the increasing performance and demands, modernize for both flood control and water and maintain the City-desired flood control level of service (LOS). The City is a highly urbanized coastal located in southeast Florida and is a economic resource to the Bounded by the Atlantic Ocean and the environmentally sensitive Biscayne Bay Aquatic Preserve, which is also an Outstanding Florida Water (OFW) the study area covers approximately 4,200 acres. The area has that is intersected intracoastal waterways with limited natural and areas of re- development The climate entails rainfall and tidal influence. These factors all contribute to historical and potential future severe rainfall and tidal 2 p Is and No. 1: Quantify and improve flood control LOS, that is, the degree of f1ood ~~''"'n'"'"' based on a 20-year improvement program; Objective Number 2: of Hooding; © 2012 CDM Smith AU Rights Res<erwd No.3: Facilitate and operation and maintenance 496 ES-1 Objective No.5: Coordinate and facilitate accelerated of No.6: storm water conservation of fresh water; and treatment; review of projects under current and out" and well for No.7: Refine and recommend to the storm water ordinances and assess of the Storm water No.8: Provide recommendations for sea\valls to increases over the next 50 years . . 3M the effects of sea level As part of this SWMMP, surface water modeling was performed the EPA Storm water Model (SWMM) to estimate and evaluate existing flooding LOS and alternative solutions to meet refined LOS Water evaluations were conducted using the CDM Smith \1\latershed Model These tools can be used to support 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 Airport ~ South Florida Water Management District (SFWMD) and and at Miami International FDOT) land use Subsurface and geotechnical information obtained from the Natural Resources Conservation Service (NRCS) and 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 Administration (NOAl\) Miami-Dade County and sourced aerial mapping of the Light Detection and data from SFWMD m LiDAR data from Miami-Dade w Models developed other consultants for projects currently under construction or with construction completed for the C!P Office and the Florida (FDOT) m Basis of Reports and design under construction or with construction other consultants fix FDOT and projects for the City's C!P Office ~ Construction record drawings for construction @ 2012 CDI''>'1 Smith A!! Right~ R:ewrv·~cl 497 for the City's CIP Office ES-2 " data collected the CDM Smith team's surveyor, Hadonne Neighborhood surveys by the which are maintained the CDM Smith used the United States Army Corps of (USACE) "-'-<'"'"'''""" Circular 1165-2-212: Sea-Level Consideration for Civil Works direct and indirect effects of projected future sea level change (SLC) across a life for stormwater improvements and a for seawalls. The USACE guidance document presents an approach for for a range of possible future rates of SLC, intermediate and high. the three scenarios to maximize the benefits '""·"'"'"""future SLC. Evaluation of LOS '"''r·tnr·rn,rn which based on the to have a tidal mean high water condition of 0.6 7ft. NAVD. However, calculations have been for the projections (0.84 ft. NAVD) in the instance that SLC accelerates (Figure 1). This SLC included a variety of mean high tide elevation predictions over the next 20 years in combination with SFWMD det1ned storm events. For the next 50 year based on statistical period, a minimum seawall elevation recommendation was established of Federal Emergency (FEMA) tidal the stillwater elevation is the maximum storm induced water surface 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, the stillwater elevations published in the FEMA Flood Insurance (FlS) issued in 2009. The statistical determined the tidal stillwater elevation as 2.2 ft NA VD. CDM Smith a recommendation of a minimum seavvaii of l foot above the 1- year tidal stillwater + 2.2 ft NAVD ;;;;; 3.2 ft Since the stillwater is based on statistical analysis rather than tidal data from the gage, CDM Smith correlated the recommended minimum sea wall height to the mean high water (MHHWJ information used in the evaluation of the stormwater recommendations. The USACE- based was applied to determine where the current MHHW tide conditions relate to the recommended seawall height over the next (Figure The MHHW tide conditions observed in Miami Beach tbe months of and October relate to the annualized MHHW data recorded from the Key gage. The current, Year 2009, annualized MHHW elevation is 1.6 ft NAVD. For ofSLC, CDM Smlth recommends that projections be referenced to the same data source, in this instance, tidal records from Virginia Key. This conditions. The recommended minimum does not events, which may coincide with hurricanes and other natural disasters. © 2012 CDM Smith All Rights Reserved 498 normal tidal extreme tidal ES-3 ~ (Q (Q USACE curves are based on the Circular EC 1155-2-212, on October 1, 2011 and ""'"t<>mh<>r 30, 2013. tlS -4-~ USACE NRC Curve I tt8 -. ® USACE NRC Curve !! "0:-* USACE NRC Curve m .. ,2! .. ~ t:; .. lli IJ] IJ.6 ::iE 03 (l2 .. IJ.1 0 1980 KM':i226 Eid<x:x @ 2012 C:DM Smith A!l Rights Reserved Key Tidal Data 1985 1990 1995 2000 2005 Year 2010 2015 2020 2025 Historic and Mean Water Levels at 2030 ES-4 U'l 0 0 USACE curves are based on the Circular EC published on October 1, 2011 and !.. (lJ .... ~ ~ (\1 3.5 3 2 ::;: 1 0.5 0 2010 #.¢«'¢%>;:# ¢'¢¢¢'#&-""* #'&""' MOO ~~~~~~ ~~~--~~~~~~-~---~----:>----·""' -----4/bt"'""" --:::~~~~:::::~~-~-~-~~~-~~~~~~~-~~~-----·----·------· ___ ------· -----&"$ //4<-,4b,M"' USACE NRC Curve l -·@ USACE NRC Curve l! -•-USACE NRC Curve l!i (High) 2015 2020 2025 2030 2035 2040 2045 2050 2055 2060 Year PrlrliPrtP•fl Mean Water Levels at ESS KJI;tl?.J6f.<idon © 2012 CDM Smfth AH Rights Res€rvcd As a to the CDM Smith utilized the FEMA's Hazards United States (HAZUS) tool designed to estimate hazard~induced losses for use state, regional and local and in for risk emergency response and recovery. By a standard FEMA the City will benefit in the coordination of future activities related to flood proofing, assistance, and management of repetitive loss The which was for South incorporated structure and land use data along with information from the detailed flood model HAZUS model an output that consists of a amount in dollars that is based on the percentage of total value loss a structure incurs during a flood event, Hke the calculated inches of rainfall in 24 The primary purposes of LOS criteria are to and Program are to roads for emergency and evacuation tramc during 5.9 inches of rainfall in 24 hours below the first floors of homes and The LOS criteria were first used to and define potential areas The LOS criteria were then used to evaluate the effectiveness of'""'''"··"' achievement decisions affected the size and cost .5 p e and COM Smith recommendations and proposed modifications to language included in the City's Public Works Manual, City and policy documents. Implementation of these modifications should be coordinated with the various Departments Public CIP. Planning, Attorney, and Performance Office. Recommendations vvere made based on the m Stormwater Models and Future Condition Analysis of tidal conditions for future efforts should utilize tidal conditions as defined 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 intermediate scenario for SLC based on a current 2009) mean high water elevation at0.29 ft. NAVD and a projected Year 2030 mean high water elevation at 0.6 7 ft. NA VD and Reuse m Sea~ Level Rise Considerations The SWMMP recommends the monitor SLC phenomena and possibly local and regional climate change advisory committees regarding regional recommendations related to SLC. © 2012 CDM Srnh:h All Rights Reserved 501 E5~6 Seawall Height Considerations J n statistical of the stillwater and tides of 1.6 ft NAVD the SWMMP recommends based on the USACE intermediate scenario, the establishment of a minimum seawall of 3.2 ft. NAVD, which provides greater than 50 years of sea wall nrr.tor•!"! elevations. Station O&M Standards and O&M OutfallsjBackflow Preventer Standards and O&M Well Standards and O&M Swa!esO&M Exfiltration Trench O&M 100-Year Storage Storm water Standards ES.6 p e and P was used to the most effective for flood control, water quality, aquifer recharge, and stormwater and use. The tiered approaches were formulated from the simplest tier 1 (e.g., back flow preventers) through the most tier 4 storage), and bundled to determine the economic feasibility of proposed infrastructure Due to the anticipated capital investment and permitting to discharge into Biscayne the tiered will allow the City to nPr'>>'<><h' \Vith specific elements of the BMP treatment train as economic conditions This would allow for future addition of tiers to meet the full LOS while to sea- level rise conditions, ES.7 P ons using the FEMA HAZUS tool showed that the topographic conditions in Miami Beach have signifkant economic losses associated with flood events, for both rainfall-induced and Improvement (ClPl A prioritized stormwater CIP list based on the ongoing projects and areas identified in the SWMMP was developed. In addition, CDM Smith recommendations overall stormvvater management needs to achieve better O&M, and standards for existing and future conditions. © 2012 COM Smith AI! Rights Reserved ES-7 502 Three and of Projects Under Final and CIP SWMMP-Identified Projects. CDM Smith recommends approximately (!ow to 0.67 NAVD the stormwater management level rise adjustment of $10 million to account for the potential!J"'"""'"'"' accelerated sea-level rise to 0.84 ft NAVD mean tidal (high subsequent additional stormwater needs. CDM Smith also reviewed O&M costs associated within these identified capital projects. Table ES-1 shows the timeframes and costs of the orc,oo:sea Table ES-1 City of Miami Beach Stormwater Management Master Plan Capital Costs (in Million $) The CIP was also evaluated both technically and based on a planning horizon. However, the life of the pumping components and CDM Smith's in the of other SWMl'v1P, it was concluded that a 20-year planning cycle was of SLC in shorter time increments. The financial of the Storm water shows that it will finance the construction of recommended C!P projects and to and maintain the the next 20 years. ® 2012 COM Smith AI! Rights Res.ervtd 503 to ES-8 .8 ndus ns The submitted SWMMP comprehensive recommendations for storm water management system n<>rtn.rrr'"''"'"" for the next 20 years. been to potential rainfall related sea-level rise, water quality of of an expanded system. The improvements allow the be flexible and in LOS objectives were defined through the initial means by which the SWMMP addresses them are also noted. and flood control LOS based on a program; SWMMP Solution: A comprehensive to flood control LOS with the economic requirements to meet LOS and water the CJP to $206 million a financial SLC projections over the Number 2: Quantify economic impact of the capital SWMMP Solution: FEMA HAZUS evaluation documents the economic of on the region of the that the of the tourism revenue. The $196 million CIP quantifies the economic to meet LOS. the CIP to $206 million provides a financial SLC ~ Objective Number 3: Facilitate and prioritize O&M; SWMMP Solution: Refinements and of current O&M practices have been evaluated with a projected cost as part of the development of recommendations. These considerations are included in future of the Stonnwater Utility; Number 4: Augment SWMMP solution: The BMP Treatment train tiered solutions "tn,r"c'"' and treatment solutions protect and improve vvater and '-'UCC11U<H \'\later for Number 5: Coordinate and guide review ""'""'T" under current and facilitate accelerated out" projects; SWMMP solution: out have been and concurrency reviews have been performed to guide the development of stormwater solutions under construction that are consistent with the SWMMP; © 2011 CDM Smith .A!! RighB Rf>wrvf'd 504 ES-9 Number 6: Identify stormwater consenration of fresh water; and \vel! for SWMMP solution: Tier 1 through Tier 4 BMP Treatment Train recommendations '""'"'h"'.""' the under the while storage solutions that promote and reuse of treated stormwater; Number 7: Refine and recommend updates to the City's stormvvater ordinances and assess of the Storm water SWMMP Solution: Recommendations to refine ordinances and policies related to SLC are while identifying the revenue Storm water Number 8: Provide recommendations for seawalls to increases over the 50 years; those of the SWMMP Solution: and elevation standards for seawalls have been made with consideration of SLC, based on USACE guidance documents. A recommendation of a minimum seawall height of 3.2 ft NAVD a means to tidal conditions over the next 50 years, based on intermediate SLC ""''""'''" The presented SWMMP addresses the objectives defined at the initiation of the solutions are consistent vvith the statement defined at the project ~th >\!\13225 ES.docx © 2012 CDM Smith A!! Rights ResNved and defensible." 505 ES·10 U'l 0 0) O!d Plan determined needs by_ New P!an determines need$ by· •Data collection -Flooding model analysis +bod c::miml ~l!Jater uuality GOING FORWARD !mplernent Stormwater System Improvements Monitor change in sea level rise: Modify programmed stormwater improvements 8 Tidal Boundary Conditions-Coastal Systems International Introduction Role of Coa~ta! Systems on COM Smith Team Review of Key Terms and Definlt!ons Drainage Outfall Design Criteria Reference Tidal Datums Historical Tidal Data Analysis Sea Level Rise Trends Recnrnmerwatlans to CDM Smith Team U'l 0 ....... T irn is Dhector ot Engineering fw Coastal Systems Subr.cmsultam to CUM Smfth ~Coastal Engineering Tidal Biscayne Bay and Effe1;t on Drainage Tidal Data Analysis DeflnWons included ~n workshop handouts Vislt NOAA web site W"WW.tidesandcurrent~U1t>aa.gov devation at Biscayne NOAA-· National Oceanic and Atmospheric Administratio~1 Cum;·nt T!dal Epoch~·· bB~~ed on data from 1983-2001 I"~<Ld kb.~.,·,J~,-.: Cmll.l!t!<.>t"<~ U'l 0 00 r,,y. rh~: Fl.orida .Ur-p~.:,mtnt of Tr.u<~p·)rt:z~mr\ (r!XYL 20J2) r~quir~ the t:~«" of MHW Cunent Tidal Epoch -based on data torn %.!83¥200 l NON\ Tfde Stations on the Fast Coast of rloJida with water !ave! dt~tn '~"' Trend from observed data is 0.11b !nchesfyear How do the observed averages compare with the MHW daUm? U'l 0 <0 2 (.!··' ~ ~ C' " ~~I Trend frorn observed data is 0:118 inches/year 25-Year Projection Is OA1' NAVD Shoreline Elevations should be Reviewed .<;mm:.-,·!Pr:. ?!VJ7 J\'Ht:h&el t. 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