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2019 Coastal Resiliency Plan-Final Report
Coastal Resiliency Plan Resilience Plan Development Prepared for: City of Sebastian 1225 Main Street Sebastian, FL 32958 Prepared by: Coastal Resiliency Plan – Resilience Plan Development Prepared for: City of Sebastian 1225 Main Street Sebastian, FL 32958 Prepared by: Kimley-Horn and Associates, Inc. 100 2nd Avenue South St. Petersburg, FL 33701 © Kimley-Horn and Associates, Inc. CA 00000696 March 2019 St. Petersburg, Florida 148882000 This document, together with the concepts and designs presented herein, as an instrument of service, is intended only for the specific purposes and client for which it was prepared. Reuse of and improper reliance on this document without written authorization and adaptation by Kimley-Horn and Associates, Inc. shall be without liability to Kimley-Horn and Associates, Inc. Vulnerability Assessment Page 1 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 TABLE OF CONTENTS 1 INTRODUCTION ........................................................................................................... 2 2 BACKGROUND ............................................................................................................. 2 3 RESILIENCE PLAN DEVELOPMENT ................................................................................ 3 3.1 PROJECT KICKOFF ......................................................................................................... 3 3.2 DATA COLLECTION AND REVIEW .................................................................................. 3 3.3 INNUNDATION MAPPING ............................................................................................. 4 3.3.1 TIDE CONDITIONS AND PLANNING HORIZON (SEA LEVEL RISE) ............................. 4 3.3.2 RAINFALL AND SURGE DATA ................................................................................. 6 3.3.3 INUNDATION SUMMARY ...................................................................................... 7 3.4 VULNERABILITY ASSESSMENT ...................................................................................... 8 3.4.1 2070 SEA LEVEL RISE (NOAA HIGH) ....................................................................... 9 3.4.2 CITY STREETS AND EVACUATION ROUTES ............................................................. 9 3.4.3 FDOT OUTFALLS ................................................................................................. 10 3.4.4 GOVERNMENT FACILITIES AND SHELTER ............................................................ 11 3.4.5 LIFT STATIONS .................................................................................................... 11 3.4.6 CANAL SYSTEM ................................................................................................... 11 3.4.7 FUTURE LAND USE ............................................................................................. 12 3.4.8 SOCIETAL EXPOSURE .......................................................................................... 12 4 CONCLUSIONS ........................................................................................................... 12 4.1 ADAPTATION ACTION PLAN ....................................................................................... 12 LIST OF FIGURES FIGURE 1: LOCATION MAP ........................................................................................................... 2 FIGURE 2: TRIDENT PIER (STATION 8721604) MHHW RECORDINGS ............................................. 5 FIGURE 3: FUTURE SEA LEVEL RISE PROJECTIONS ........................................................................ 5 FIGURE 4: FEMA DFIRM – EXAMPLE GLASS WALL ........................................................................ 8 FIGURE 5: CITY OF SEBASTIAN 25-YEAR/24-HOUR FLOOD EXTENTS ........................................... 10 FIGURE 6: CITY OF SEBASTIAN - FDOT OUTFALLS ....................................................................... 11 LIST OF TABLES TABLE 1: COMMON PLANNING HORIZONS .................................................................................. 6 TABLE 2: RAPID INUNDATION RAINFALL INPUTS .......................................................................... 6 TABLE 3: RAPID INUNDATION SURGE HEIGHT INPUTS ................................................................. 7 TABLE 4: GOVERNMENT FACILITIES CRITICALITY CLASSIFICATIONS .............................................. 8 TABLE 5: LIFT STATIONS PRIORITY CLASSIFICATION ..................................................................... 9 TABLE 6: POTENTIAL ADAPTATION STRATEGIES ......................................................................... 13 LIST OF APPENDICES APPENDIX A .........................................................................................KICK-OFF MEETING NOTES APPENDIX B........................................................................................... ASSET-THREAT MATRICES APPENDIX C .......................................................................... PROGRESS MEETING PRESENTATION APPENDIX D .................................................................. NOAA COASTAL FLOOD EXPOSURE MAPS Vulnerability Assessment Page 2 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 1 INTRODUCTION Kimley-Horn was retained under Consultant Service Agreement (CSA) #1 with the City of Sebastian (the City) to provide professional services for the City to prepare a Coastal Resiliency Plan. In 2018, the City received funding through the Florida Department of Environmental Protection (FDEP) Program for Resilient Coastlines. This project is part of an effort by the City to build resilience into the City’s Comprehensive Plan. To support the Comprehensive Plan Update, a vulnerability analysis of the City’s critical infrastructure and social elements is required to evaluate coastal flooding. Specifically, this report provides a summary of the Vulnerability Assessment performed and the development of an Adaptation Action Plan. 2 BACKGROUND The City is located in the Indian River Lagoon Basin on the east coast of Florida, bordered by the Indian River and the Saint Sebastian River, shown in Figure 1 below. FIGURE 1: LOCATION MAP The City is approximately 14.9 square miles with mixed urban and suburban areas populated by 25,174 (2017) residents. Elevations throughout the City range from 53 feet to 0 feet east to west, with a high ridge line along the Florida East Coast Railway running North-South through the City generally paralleling US 1. The City also maintains more than 10 miles of canal systems that eventually outfall into the Indian River. SEBASTIAN ST. SEBASTIAN RIVER STATE PARK Vulnerability Assessment Page 3 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 3 RESILIENCE PLAN DEVELOPMENT 3.1 PROJECT KICKOFF A kickoff meeting took place on October 30, 2018 with the City to discuss the objectives of the Coastal Resiliency Plan, flow of information, the project schedule, and existing datasets. Meeting notes were prepared and submitted to the City on November 2, 2018 and are included in Appendix A. 3.2 DATA COLLECTION AND REVIEW Kimley-Horn reviewed the available GIS files, as-builts and other information provided by the City which included: GIS Shapefiles o City of Sebastian City Boundary o City of Sebastian Future Land Use o City of Sebastian Zoning o City of Sebastian Common Resource Area o City of Sebastian FEMA Zones o Indian River County Parcels o Indian River County Parks o Indian River County Road Centerlines o Indian River County Road Names o Indian River County Evacuation Routes o Indian River County FDOT Outfalls o Indian River County Building Footprints o Indian River County Government Facilities o Indian River County Shelters o Indian River County Lift Stations As-Builts o Indian River County Lift Stations o City of Sebastian City Hall o City of Sebastian Police Station Miscellaneous Information o City of Sebastian Stormwater Management Master Plan Update (2013) o City of Sebastian Seawall Assessment (2015) o Sebastian Municipal Airport Proposed Aircraft Hanger ‘A’ Vulnerability Assessment Page 4 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 o Sebastian Municipal Airport Proposed Aircraft Hanger ‘B’ o Pelican Island Elementary School o City of Sebastian Staff Testimonial Flooding Map To further support the Coastal Resiliency Plan for the City, Kimley-Horn acquired and reviewed the following additional data: o 2007 Indian River County Digital Elevation Model (DEM) o National Oceanic and Atmospheric Administration (NOAA) monthly average water level reports for Station 8721604 Trident Pier, Port Canaveral, Florida o NOAA and United States Army Corps (USACE) sea level rise projections o University of Florida GeoPlan Center - Sea Level Scenario Sketch Planning Tool o NOAA Coastal Flood Exposure Mapper o Saint Johns River Water Management District (SJRWMD) Basis of Review Rainfall information o Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps (FIRM) Maps revised and effective December 2012 o Treasure Coast Regional Planning Council (TCRPC) Storm Tide Atlas Indian River County o VERTCON - North American Vertical Datum Conversion 3.3 INNUNDATION MAPPING 3.3.1 TIDE CONDITIONS AND PLANNING HORIZON (SEA LEVEL RISE) Given the planning nature of this project, a Rapid Inundation Assessment Method was used to project flood risk. Rapid inundation technology works by routing water over the terrain using a simple set of rules based on how water levels respond to the topography (i.e. available information such as a Digital Elevation Model). Stormwater pipe infrastructure is not included in rapid inundation modeling. Applying the Rapid Inundation Assessment Method to this project has the following advantages: o Provides an immediate appraisal of flood risk. The tool creates raster files which are imported into GIS and provides flood depths (click anywhere on the map to see flood depths). o Enables the run of multiple scenarios (e.g. 2070 sea level rise, sea level rise with coupled rainfall) to identify vulnerable areas. o Correlates results with other online tools such as the University of Florida’s Sea Level Rise Sketch tool, NOAA Coastal Flood Exposure Mapper. The 2007 DEM was used as a basis for the model and all elevations in the tool are based on the North American Vertical Datum of 1988 (NAVD 88). (Topographic voids for new infrastructure or earthwork projects constructed after 2007 were not included in this analysis.) The water elevation or boundary condition within the model was set at an elevation of 1.32 feet NAVD. This water elevation is based on the average Mean Higher High Water (MHHW) over ten years; Vulnerability Assessment Page 5 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 collected through NOAA historical water elevation data at the Trident Pier gauge (Station 8721604). The observed water levels can be seen in Figure 2. FIGURE 2: TRIDENT PIER (STATION 8721604) MHHW RECORDINGS Information to assess coastal flooding was obtained from the nearest NOAA (2012) and USACE (2013) Sea Level Rise (SLR) Projections at the Daytona Beach Shores Gauge (Station 8721120), shown in Figure 3. FIGURE 3: FUTURE SEA LEVEL RISE PROJECTIONS When evaluating coastal flooding impacts, it is necessary to select a Planning Horizon (i.e. how far into the future) in which to protect the built and natural environments. Planning horizons are Vulnerability Assessment Page 6 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 based, in part, on the anticipated functional life expectancy of the facilities in various asset classes. Some common planning horizons that have been used by other localities’ regional compacts and federal agencies within Florida (as well as other areas around the United States) are provided in Table 1. TABLE 1: COMMON PLANNING HORIZONS At the kick-off meeting, the City requested to use a 50-year planning horizon. The 50-year horizon is consistent with the information in Table 1 and reasonable for the infrastructure of interest and associated societal exposure. The infrastructure evaluated included: o City of Sebastian Government Facilities o City of Sebastian Shelters o City of Sebastian Lift Stations o City of Sebastian Emergency Evacuation Routes o City of Sebastian Streets 3.3.2 RAINFALL AND SURGE DATA The 25-year and 100-year 24-hour rainfall events were simulated in the Rapid Inundation tool using the rainfall totals shown in Table 2 below. The Florida Modified Type II (SCS) rainfall distribution was used in the analysis and is consistent with SJRWMD’s requirements for evaluating flood risk. TABLE 2: RAPID INUNDATION RAINFALL INPUTS Rainfall Event Rainfall Total* 100-year/24-hour 12 inches 25-year/24-hour 9.5 inches *Rainfall totals obtained by the SJRWMD isohyetal maps Category 1 and 3 hurricane events were modeled based on surge projections, shown in Table 3 below, from the Florida Division of Emergency Management and the Treasure Coast Regional Planning Council. It should be noted that the events modeled do not include wave propagation and wind speeds. Vulnerability Assessment Page 7 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 TABLE 3: RAPID INUNDATION SURGE HEIGHT INPUTS Hurricane Event Surge height* Category 1 Up to 4 feet Category 2 Up to 11 feet *Surge Heights in Feet above NAVD88 obtained by the Indian River County Storm Tide Atlas 3.3.3 INUNDATION SUMMARY Based on the parameters described above the following events were simulated in the Rapid Inundation tool: o 25-year/24-hour Event o 100-year/24-hour Event o 2070 Projected Sea Level Rise (High) o 100-year/24-hour Event with 2070 Projected Sea Level Rise (High) o Category 1 Surge Event o Category 3 Surge Event The 100-year/24-hour and 25-year/24-hour inundation extents were compared to the FEMA Flood Insurance Rate Maps (FIRM) and the results generally confirmed the results shown in the maps and study. The areas that appear to be inconsistent between the two maps are most likely due to drainage infrastructure not modeled either relieving areas of flood waters or introducing flood waters through conveyance to another. Additionally, some of the flood extents on the FIRM have a glass wall in the model which inhibits reasonable flood extents, for an example see figure 4 below (Glass walls in numerical modeling, is when storage is not adequately parameterized, the model will generate a fictitious vertical wall that artificially raises flood stage elevations. These walls typically occur at the stage/area relationship when either the highest elevation is breached or the corresponding storage is not accounted for resulting in a wall that inhibits floodplain projections). The coastal flooding impact extents produced by the sea level rise in the Rapid Inundation tool were compared to the University of Florida’s Sea Level Sketch tool (https://sls.geoplan.ufl.edu/), and overall showed a good correlation with inundation extents. Likewise, the surge results for both Category 1 and 3 events compared favorably to results in NOAA’s Coastal Flood Exposure Mapper. The City was able to see initial results of these inundation extent comparisons in a web meeting conducted on January 17, 2019. The raster files containing flood depths for each event are provided as a separate attachment within a file geodatabase (GDB). Vulnerability Assessment Page 8 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 FIGURE 4: FEMA DFIRM – EXAMPLE GLASS WALL 3.4 VULNERABILITY ASSESSMENT Assets exposed to flooding were evaluated through the development of a paired asset-threat matrix. A paired asset threat matrix essentially links an asset to multiple threats (i.e. sea level, rainfall, surge) and helps to identify which assets are vulnerable to flooding. Appendix B contains the asset-threat matrices prepared for this analysis. The approach taken to assess vulnerability involved a comparison of an inundation event versus a known elevation (all in NAVD datum). Known elevations were derived from either as built elevations provided by the City or the Digital Elevation Model at specific points. As built elevations were converted from NGVD 29 to NAVD 88 when necessary, if as-builts were already in the correct datum no conversion was needed. For the purposes of this study and where pertinent, assets were grouped into criticality classifications to prioritize needs for adaptations. Examples of these assets included Government Facilities and Lift Stations as shown below in Tables 4 and 5 respectively. TABLE 4: GOVERNMENT FACILITIES CRITICALITY CLASSIFICATIONS Government Facilities Criticality Definition HIGH Impacts emergency or critical infrastructure needed during major events MEDIUM Impacts infrastructure where individuals may work or live LOW Impacts outdoor facilities “Glass wall” creating a flood barrier Vulnerability Assessment Page 9 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 TABLE 5: LIFT STATIONS PRIORITY CLASSIFICATION Lift Stations Priority*Definition HIGH More than 3' of flood water - Impact to electrical equipment MEDIUM More than 2' of flood water - Possible impact to electrical equipment LOW Flood waters - Pumps will still remain in operation *Lift stations have been classified by priority rather than criticality due to the unknown of station importance by the County. Classifications will be updated once it is confirmed how much of the population each station will serve. A summary of the vulnerabilities is provided in the following sections. 3.4.1 2070 SEA LEVEL RISE (NOAA HIGH) The results from 2070 show limited impacts along the Eastern coast. From a topographic perspective the high ridge along the eastern shoreline is generally effective against sea level rise. (Since pipes were not included in the evaluation there may be landward impacts from direct outfalls where sea level rise is causing backwater impacts; the impacts from this standpoint are unknown given the limitations of this analysis. From the datasets provided there are two FDOT outfalls within City limits). There are impacts along the southern bank of the Sebastian River (notably at Donald MacDonald Park and Dale Wimbrow Park) most of the structures exposed to sea level rise are outside of the City limits with the exception of a few backyards off of Robin Lane. Since the 2070 NOAA High results showed limited exposure to the terrain, intermediate scenarios were not evaluated. 3.4.2 CITY STREETS AND EVACUATION ROUTES The results for 2070 sea level rise show nominal impact to City maintained streets and Emergency Evacuation Routes (US Highway 1 and Sebastian Blvd.). However, the flood extents from the 25- year, 100-year and 100-year plus 2070 sea level rise events indicate flooding at various locations within the City. These locations generally match known areas of flooding provided by the City (See figure 5 below for areas identified by City Staff as “Severe Flood Areas – 4 to 6 inches” overlaid on the 25-year flood extents) and as discussed during a meeting on February 19, 2019 (See Appendix C). Given the limitations of the Rapid Inundation approach some locations where flooding is predicted may be over-estimating flood extents as drainage infrastructure is not included. Existing flooding levels of service for City-maintained roads were not provided or readily available. A review of the City’s land development code, indicated that new streets within the City must meet the following guidelines: o the centerline profile of the roadway may not have flood waters exceed two inches above the lowest elevation during a 25-year/24-hour events: o all bridges should be designed to pass the 100-year/72-hour storm. No level of service issues along the evacuation routes were identified in the model or by City staff. Vulnerability Assessment Page 10 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 FIGURE 5: CITY OF SEBASTIAN 25-YEAR/24-HOUR FLOOD EXTENTS 3.4.3 FDOT OUTFALLS Although pipes were not included in this analysis, landward impacts from sea level rise is a common problem for coastal communities due to the direct outfalls where sea level rise can cause backwater impacts. Two outfalls provided are within the City limits and could benefit from an inline check valve that inhibits tidal backflow and future sea level rise from inundating the City further inland given upstream pipe connectivity. Vulnerability Assessment Page 11 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 FIGURE 6: CITY OF SEBASTIAN - FDOT OUTFALLS 3.4.4 GOVERNMENT FACILITIES AND SHELTER The government facilities owned by the City that are impacted by the generated inundation extents are low on the criticality scale since they are outdoor facilities; not critical during major events and not places where individuals reside or work. All buildings and/or shelters do not appear to be impacted by any events evaluated. 3.4.5 LIFT STATIONS Multiple lift stations along the coastal area within the City limits appear to be exposed with more than 3 feet of flood waters during a Category 3 event causing station failure. These stations are not considered critical to the City because they do not serve more than fifty (50) residential units. These stations should still be prioritized as areas to increase resiliency within, but station failure will not impact a large number of citizens. 3.4.6 CANAL SYSTEM During the meeting on February 19th, 2019 City staff indicated that meeting the appropriate level of service in the canal system has been an ongoing issue. Erosion along canal banks has impacted bulkheads and side slopes such that the systems are compromised and in need of repair. Additionally, many of the bulkheads are privately owned making repairs more difficult for coordination. The 2070 Sea Level Rise results do not show the canal system within the City to be exposed, this could be due to the limitations of no drainage conveyance systems modeled. Conversely, during the 25 and 100-year events, the canal systems appear to be completely filled with some areas overtopping impacting homes. Vulnerability Assessment Page 12 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 3.4.7 FUTURE LAND USE Future land use overlaid by the 25 and 100-year events displays that the main issues appear to be in the future institutional and general commercial areas in the southern portion of the City limits. These areas at present are low lying and are vulnerable to flooding. If the City intends to develop these areas the ground elevation should be raised. When 2070 sea level rise is overlaid on the future land use map, future issues can be seen along the riverfront mixed use areas. The issues with sea level rise appear to mainly impact the dock areas as opposed to the further inland riverfront mixed use area. 3.4.8 SOCIETAL EXPOSURE Due to our limitations on census block data, we were not able to overlay the rapid inundation results on demographic information. As such the NOAA Coastal Flood Exposure tool (https://coast.noaa.gov/digitalcoast/tools/flood-exposure.html) was used to generate maps to supplement this information, see Appendix D. More than 25% of the City is over the age of 65 making it more difficult for rapid evacuation. At 65 years of age and older it is also common to be retired, on a fixed income, potentially vulnerable due to lack of funds if a home needs to be repaired. As shown in the NOAA Coastal Flood Exposure Mapper the Categories 1 through 5 storms only affect a small portion of the City, but will cause need for evacuation and demographics may impact the warning time that the City will need to provide to residents. 4 VULNERABILITY SUMMARY The results from our analysis indicate that a majority of the City’s infrastructure does not appear to be at risk from sea level rise based on the current datasets for 2070 and only some infrastructure is at risk during major rain events based on the 25-year and 100-year inundation extents. o Impacts to Government Facilities and shelters are not critical, it appears that inundation extents impacted outdoor facilities. o Impacts to City streets exist throughout the City limits but may be over exaggerated due to the limits of this study, no drainage infrastructure accounted for. o Impacts to evacuation routes are limited to small areas on Sebastian Boulevard, but appear to be contained on the road shoulder. o Impacts to lift stations are concentrated near the coastal area of the City limits and flooding does not impact master lift stations serving more than fifty (50) residential units. 5 ADAPTATION ACTION PLAN Based on the vulnerabilities identified and subsequent discussions with the City potential adaptation strategies were devised. The adaptation strategies were screened qualitatively using the following criteria: ·Ability to increase resilience ·Cost and benefits ·Community acceptance ·Environmental impacts ·Socio-economic impacts A summary of the screening criteria is provided in the table below. Vulnerability Assessment Page 13 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 TABLE 6: POTENTIAL ADAPTATION STRATEGIES Potential Adaptation Strategies Ability to Increase Resilience Cost and benefits Community Acceptance Environmental Impacts Socio- economic impacts Canal Bank Inspections ●●●●● Define Street and Structure Level of Service ●●●●● Retrofit Outfalls with Inline Check Valve ●●●●● Update Comprehensive Plan ●●●●● Update Stormwater Master Plan ●●●●● Raise Lift Station Electrical Controls ●●●●● *Level of value to the City:● = High ● = Medium ● = Low The table above summarize potential adaptations and their impacts within the community. In terms of assessing strategies to protect City assets we have generally categorized the adaptation strategies into two classifications, short term and long term. The short term actions or adaptations are those that can be implemented immediately, while long term actions will require more coordination and time. Short Term Actions: o Define existing street and structure flooding levels of service. Timeline approximately 6- 12 months. o Locate and map all City outfalls. It is recommended that the outfalls be retrofitted with an inline check valve to inhibit coastal flooding. Timeline approximately of 3 to 6 month and cost range between $5,000 to $20,000. o Update the Comprehensive Plan Elements specific to Peril of Flood and this analysis. Timeline 2Q/3Q 2019. Long Term Actions: o Conduct a level 1 inspection of exposed and submerged canal bank/bulkheads structural elements within the City. The evaluation should include a determination of property rights associated with banks/bulkheads. For approximately 10 miles of diving banks/bulkheads a preliminary cost will range between $400,000 to $800,000 with an expected timeline of approximately 3 to 6 months. For an inspection of only exposed elements the timeline would be decreased to 1 to 3 months and cost between $100,000 to $300,000. o The discrepancy in costs can be attributed to the unknowns when diving within the canal, for example a wildlife specialist needing to be present. The evaluation of canals also depends on the bank and bulkhead structural materials, evaluations can require more time and analysis depending on the material as well as points of access. Vulnerability Assessment Page 14 kimley-horn.com 100 2nd Avenue South, Suite 105 N, St. Petersburg, FL 33701 727-547-3999 o Update the 2018 Stormwater Master Plan – this would include a City-wide evaluation to update the numerical model with the latest datasets. If a new DEM is available, this is recommended to be incorporated and the model parameters revised accordingly. A detailed inventory of stormwater assets should be completed and can be accomplished by supplementing as-built information with drop down measurements and where necessary conventional surveying. The Rapid Inundation flood depths submitted as part of the attached geodatabase can be used to help target areas of where infrastructure exists or is required. The update of the model should include the development of a schema to enable a “plug and play” approach and increase the adaptive capacity for the City. (As conditions and parameters change in the future, an integrated schema will help streamline how the data is disseminated.) Floodplains should be developed based on latest regulatory requirements as well as identifying existing street and structure flooding level of service violations. Given the hydrology of the area, it is recommended that a pollutant load model be developed. Best Management Practices to address flooding level of service violations and water quality should be devised as part of the Master Plan update and include the impacts of future sea level rise and combined rain events. Based on the level of detail in the model, historical costs for stormwater masterplan updates for similar sized communities have ranged between $200,000 to $400,000. Typically, the more granular the model (i.e. local level) the higher the cost and if the City seeks to include coastal flooding evaluations, the higher range is reasonable. Timeline approximately 24 months. o Liaise with the County to devise a consensus roadmap to harden (raise electrical controls) the pump-stations based on their criticalities. Timeline is dependent on Cities economic ability to raise multiple pump station controls at once, due to economic limitations the timeline could range from 2 months to multiple years. o Discuss the potential of early warning notifications for elderly residents within the City. Notes: The costs presented above are preliminary/planning level costs; more detailed estimates should be completed for budgeting purposes. Costs provided herein are based on the information known to the Consultant at this time and represent only the Consultant’s judgment as a design professional familiar with the construction industry. The Consultant cannot and does not guarantee that proposals, bids, or actual construction costs will not vary from these costs. Timelines identified above are for implementation and do not account for procurement. City of Sebastian Vulnerability Assessment March 2019 APPENDIX A: KICK-OFF MEETING NOTES From: Klepper, Kelley Sent: Friday, November 2, 2018 10:59 AM To: Lisa Frazier <LFrazier@CityofSebastian.org> Cc: Niforatos, Chris <Chris.Niforatos@kimley-horn.com>; Battles, Sara (Green) <Sara.Battles@kimley- horn.com>; DiMaria, Philip <Philip.DiMaria@kimley-horn.com> Subject: Kick-off Meeting Lisa I know you made a copy of my meeting notes; however, we wanted to also provide you with the following information. ·Meeting started at approximately 9:00 am with introductions from those present ·KH gave a short overview on resiliency and discussed the main goals of the project ·The City is focused on addressing resiliency for Critical Infrastructure. Among the assets to be included in the vulnerability analysis (City will provide as-builts for pertinent facilities*): o Schools* o City hall* o Evacuation routes o Cell towers and communications facilities o Police Department* o Fire Department* o Shelters* o Airport o Public Works building* and facility o Master Lift Stations (Shape file of locations and as-builts to be provided by County) ·City currently has a CRS rating of 7 ·City has stormwater utility in place. Non-ad-valorem assessment contained in TRIM notice. SWU was started ~ 2013 and recently updated (2017/18 ~ $5 increase in ERU) ·City Stormwater Masterplan requires an update. ·City is keen on Green Infrastructure but at present only requires it on new commercial businesses ·City does not have any highwater mark data or flooding testimonials spatially available. Institutional knowledge resides with City staff o City noted significant flooding during Hurricane Fay ~ 2009. Stormwater facilities were effective conveying flood-waters. ·FIRMs were published in 2004 with an update in 2013. Preliminary Coastal Flood Plains have been provided though not officially published. A portion of the City is still under evaluation and was not included in 2013 update. ·City initiated a seawall engineering assessment in 20015 ·City does have some of its outfalls mapped. (KH mentioned quick hit at mapping all of them and retrofitting them with tide control valves.) ·City agreed to evaluate Critical infrastructure at a 50 yr planning horizon (i.e. 2070). Roads are typically evaluated at a 20-30 year horizon as are lift stations. ·Comprehensive Plan has not been updated in some time. With Peril of Flood Act made sense to simultaneously update comp plan and perform vulnerability analysis ·KH provided a copy of the resilience presentation slides to the City. ·Schedule to complete the project is by June 2019 ·Meeting adjourned at ~ 11:00 Action items: o City to provide datasets as described above and in scope of work to Kimley Horn o Philip to work with Kim directly o City via the County will obtain shapefile and as-builts of County master lift stations located within the City Sincerely, Kelley Kelley Klepper, AICP Kimley-Horn |1777 Main Street, Suite 200, Sarasota, FL 34236 Direct: 941.379.7673 | Mobile: 941.527.9070 Celebrating 11 years as one of FORTUNE’s 100 Best Companies to Work For City of Sebastian Vulnerability Assessment March 2019 APPENDIX B: ASSET-THREAT MATRICES ASSET-THREAT MATRICES GOVERNMENT FACILITIES MAJOR_CAT NAME OWNER CATEGORIES 2070 SEA LEVEL RISE 2070 SEA LEVEL RISE + 100 YEAR 25 YEAR/24HOUR 100YEAR/24HOUR CAT 1 CAT 3 FIRM ELEVATION DEM ELEVATION CRITICALITY LOCAL GOVERNMENT SEBASTIAN CITY HALL CITY OF SEBASTIAN GOVERNMENT BUILDING 0 0 0 0 0 0 0 23.54170036 LAW ENFORCEMENT CITY OF SEBASTIAN POLICE DEPARTMENT CITY OF SEBASTIAN LAW ENFORCEMENT 0 0 0 0 0 0 0 22.27039909 CITY PARK EASY STREET PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 21.9 22.34569931 CITY PARK HARDEE PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 20.89999962 CITY PARK RIVERVIEW PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 11.02000046 0 6.329810143 LOW BOAT RAMP CAPTAIN ROBERT HARDEE BOAT LAUNCH CITY OF SEBASTIAN BOAT RAMP 3.812999964 5.893000126 0 0 3.990999937 11.01399994 7 1.821529984 LOW BOAT RAMP SEBASTIAN YACHT CLUB CITY OF SEBASTIAN BOAT RAMP 3.803999901 5.893000126 0 0 3.987999916 11.01900005 7 3.020329952 LOW CITY PARK SCHUMANN LAKE PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 24.0048008 CITY PARK BARBER STREET SPORTS COMPLEX CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 21.13439941 CITY PARK SEBASTIAN BARK PARK CITY OF SEBASTIAN PUBLIC PARK 0 21.11400032 21.07799911 21.11499977 0 0 18 19.8654995 LOW CITY PARK STORMWATER PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 20.86429977 CITY PARK SEBASTIAN SKATE PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 22.25769997 CITY PARK SCHUMANN LAKE PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 23.07259941 CITY PARK PERIWINKLE PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 19.12899971 CITY PARK AIRPORT PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 21.86969948 CITY PARK BLOSSOM STREET PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 18.7241993 CITY PARK BRYANT COURT PARK CITY OF SEBASTIAN PUBLIC PARK 0 19.95199966 19.95299911 19.95199966 0 0 0 19.48590088 CITY PARK COMMUNITY CENTER CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 15.08460045 CITY PARK FILBERT STREET PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 21.45949936 CITY PARK FRIENDSHIP PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 24.38710022 CITY PARK GARDEN CLUB PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 21.73870087 CITY PARK GEORGE STREET PARK CITY OF SEBASTIAN PUBLIC PARK 0 20.27400017 20.27400017 20.27499962 0 0 0 20.14909935 CITY PARK HISTORICAL PARK CITY OF SEBASTIAN PUBLIC PARK 0 0 0 0 0 0 0 13.60589981 CRITICALITY HIGH MEDIUM LOW Impacts emergency or critical infrastructure needed during major events Impacts infrastructure where individuals may work or live Impacts outdoor facilities Definition ASSET-THREAT MATRICES LIFT STATIONS FID Owner InstallYea LS_NUMBER ERUs SERVED Elevation 2070 SEA LEVEL RISE 2070 SEA LEVEL RISE + 100 YEAR 25 YEAR/24HOUR 100YEAR/24HOUR CAT 1 CAT 3 DEM ELEVATION PRIORITY 0 IRC 2005 1298 189 20.76000022 0 0 0 0 0 0 19.43029976 1 PVT 2013 0 0 0 0 0 0 0 23.18880081 2 PVT 2015 3223 23.73 0 0 0 0 0 0 22.7682991 3 IRC 2016 24.01 0 0 0 0 0 0 23.52960014 4 PVT 2016 3277 18.64 0 0 0 0 0 0 18.42550087 5 IRC 1981 1194 197 22.79999923 0 0 0 0 0 0 21.57859993 6 IRC 1972 1197 23 0 0 0 0 0 0 21.88019943 7 PVT 2016 22.48 0 21.72400093 21.72299957 21.71899986 0 0 11.80729961 8 PVT 2014 23.88 0 0 0 0 0 0 20.79700089 9 PVT 2017 28.08 0 0 0 0 0 0 25.47310066 10 IRC 0 0 0 0 0 0 0 11.01099968 9.622150421 LOW 11 PVT 2016 24.42 0 0 0 0 0 0 23.45339966 12 PVT 2008 11.15 0 0 0 0 0 11.02000046 9.886599541 13 PVT 2013 0 0 0 0 0 0 0 16.85230064 14 PVT 0 0 0 21.74399948 21.74399948 21.73900032 0 0 21.41699982 15 PVT 0 0 3.803999901 5.888999939 3.151000023 3.151000023 3.987999916 11.01900005 3.118900061 HIGH 16 IRC 1996 1213 23 9.02999973 0 0 0 0 0 11.01599979 7.113729954 MEDIUM 17 PVT 1991 416 8.97000026 0 0 0 0 0 11.01299953 7.739960194 MEDIUM 18 IRC 1997 1211 71 26.14999961 0 0 0 0 0 0 24.67169952 19 PVT 0 11.14000034 0 0 0 0 0 11.02099991 8.933329582 20 PVT 0 29.39999961 0 0 0 0 0 0 28.08889961 21 IRC 1994 1201 97 0 0 0 0 0 0 11.01200008 6.252240181 HIGH 22 PVT 0 8 0 5.893000126 0 0 0 11.01500034 3.840749979 HIGH 23 IRC 1990 1166 49 23.09000015 0 21.29400063 21.29500008 21.29400063 0 0 21.2343998 24 IRC 1994 1187 48 24.38 0 0 0 0 0 0 22.98509979 25 IRC 1994 1185 87 0 0 0 0 0 0 0 20.46100044 26 IRC 1992 1199 18 0 0 21.91500092 21.91600037 21.91699982 0 0 20.79380035 LOW 27 IRC 1996 1200 25.62 0 0 0 0 0 0 23.85930061 28 PVT 2009 0 0 21.64500046 21.64500046 21.6439991 0 0 20.85820007 29 PVT 2005 22.54000091 0 0 0 0 0 0 21.22769928 30 PVT 2010 20.75 0 0 0 0 0 0 19.87750053 31 PVT 1995 0 0 0 0 0 0 0 21.25830078 32 PVT 2004 0 0 0 0 0 0 0 24.35519981 33 PVT 1998 0 0 0 0 0 0 0 21.9503994 34 PVT 0 0 0 0 0 0 0 0 21.47170067 35 IRC 0 0 0 22.60499954 22.60499954 22.60400009 0 0 22.26619911 36 IRC 0 0 0 22.60199928 22.60199928 22.60199928 0 0 22.25160027 37 IRC 0 0 0 22.60199928 22.60199928 22.60199928 0 0 21.96240044 38 IRC 0 0 0 0 0 0 0 0 23.20269966 39 IRC 1981 1195 117 22.5 0 0 0 0 0 0 20.88879967 40 IRC 1981 1196 1 22.5 0 0 0 0 0 0 21.93659973 41 IRC 1981 1193 177 22.79999923 0 21.81299973 21.81299973 21.81299973 0 0 21.62809944 42 PVT 0 7.65000009 0 0 0 0 0 11.01099968 6.940629959 HIGH 43 PVT 2011 0 0 0 0 0 0 11.02099991 8.394510269 HIGH 44 PVT 0 25.5 0 0 0 0 0 0 24.63080025 45 PVT 2004 26.54000091 0 0 0 0 0 0 22.33909988 46 IRC 2005 1168 82 22.32999992 0 0 0 0 0 0 20.79630089 47 IRC 2005 1296 24 11.93999958 0 0 0 0 0 11.03499985 9.99944973 48 IRC 2002 1260 37 25.57999992 0 0 0 0 0 0 23.69079971 49 IRC 2004 1270 234 13.10999965 0 13.05500031 13.05599976 13.05599976 0 0 12.53820038 50 IRC 2006 1314 137 17.53000068 0 0 0 0 0 0 16.6427002 51 IRC 2005 1285 101 25.17000007 0 0 0 0 0 0 23.77129936 52 PVT 0 27.54999923 0 0 0 0 0 0 25.81819916 53 PVT 0 0 0 0 0 0 0 11.02200031 5.605110168 HIGH 54 PVT 0 23.37999916 0 0 0 0 0 0 23.23469925 55 IRC 2005 1299 193 25.04000091 0 0 0 0 0 0 23.16349983 56 PVT 0 26.54000091 0 0 0 0 0 0 24.92029953 57 PVT 0 25.5 0 0 0 0 0 0 24.59230042 58 IRC 1985 1202 94 23.95 0 0 0 0 0 0 24.07089996 59 IRC 1985 1163 506 22 0 19.84399986 19.84300041 19.84399986 0 0 19.35560036 60 PVT 0 32.06999969 0 0 0 0 0 0 30.19529915 61 IRC 2002 1216 194 20.44000053 0 0 0 0 0 0 19.10810089 62 IRC 1999 1212 114 20.09000015 0 0 0 0 0 0 18.52549934 63 PVT 0 9.39999961 0 0 0 0 0 11.02099991 7.038440228 LOW 64 PVT 0 9.53999996 0 0 0 0 0 11.02200031 6.571090221 LOW 65 PVT 0 0 0 6.413000107 6.413000107 6.409999847 0 11.01299953 5.752679825 HIGH 66 PVT 2009 0 0 0 0 0 0 11.01399994 9.920450211 LOW 67 PVT 2010 0 0 0 0 0 0 0 23.01009941 68 PVT 2010 0 0 21.72400093 21.72299957 21.71899986 0 0 11.80000019 69 IRC 2001 1206 25 13.29 0 0 0 0 0 0 11.51840019 70 PVT 2005 0 0 0 0 0 0 0 27.52059937 71 PVT 1989 24.95 0 0 0 0 0 0 23.80990028 72 PVT 2011 0 0 0 0 0 0 0 28.81209946 73 PVT 1999 0 0 0 0 0 0 0 24.60610008 74 IRC 2004 1198 21 23.22999954 0 0 0 0 0 0 21.61650085 75 PVT 0 30.5 0 0 0 0 0 0 29.54680061 76 PVT 0 8.5 0 0 0 0 0 11.01099968 8.550359726 MEDIUM 77 PVT 0 11.30000019 0 0 0 0 0 11.01200008 9.061450005 78 PVT 0 31.06999969 0 0 0 0 0 0 29.18650055 79 PVT 0 0 0 0 0 0 0 0 12.57740021 80 IRC 2005 1286 198 24.54999923 0 0 0 0 0 0 22.92910004 81 PVT 2005 0 0 0 0 0 0 0 22.66720009 82 PVT 1999 0 0 0 0 0 0 0 21.49360085 83 PVT 0 0 0 7.913000107 7.913000107 7.913000107 0 11.01299953 7.824550152 HIGH 84 PVT 0 0 0 21.71699905 21.71800041 21.71299934 0 0 21.57439995 85 PVT 0 0 0 0 0 0 0 0 23.21980095 86 IRC 1980 1192 148 26.5 0 0 0 0 0 0 26.24250031 87 PVT 0 0 0 0 0 0 0 0 21.91189957 88 PVT 0 0 0 0 0 0 0 0 22.66539955 89 PVT 2001 PVT 0 0 0 0 0 0 0 16.51759911 90 PVT 0 20.67000007 0 0 0 0 0 0 20.35619926 91 PVT 0 25.31999969 0 0 0 0 0 0 23.64259911 92 IRC 2001 1191 200 22.94000053 0 0 0 0 0 0 21.00180054 93 PVT 2005 0 0 0 0 0 0 0 16.87739944 94 PVT 2002 0 0 5.893000126 0 0 0 11.01099968 4.942550182 HIGH 95 PVT 0 9.5 0 0 0 0 0 11.02000046 8.274350166 LOW 96 IRC 2006 1047 49 0 0 20.30400085 20.30400085 20.30400085 0 0 19.22100067 LOW 97 PVT 0 0 0 28.76600075 28.76600075 28.76600075 0 0 28.61240005 98 PVT 0 11.96000003 0 0 0 0 0 11.01799965 9.935819626 99 IRC 1981 1263 0 0 0 0 0 0 0 21.55340004 100 PVT 0 0 0 0 0 0 0 0 23.27459908 101 IRC 2006 1048 50 22.19 0 19.87999916 19.87899971 19.87899971 0 0 19.86680031 102 PVT 0 0 0 0 0 0 0 11.01200008 6.802370071 HIGH 103 PVT 0 0 0 0 0 0 0 11.01200008 6.178110123 HIGH 104 PVT 0 0 0 5.893000126 0 0 0 11.01099968 5.146210194 HIGH PRIORITY HIGH MEDIUM LOW More than 2' of flood water - Possible impact to electrical equipment Flood waters - Pumps will still remain in operation Definition More than 3' of flood water - Impact to electrical equipment City of Sebastian Vulnerability Assessment March 2019 APPENDIX C: PROGRESS MEETING PRESENTATION City of Sebastian – Coastal Resiliency Plan PROGRESS MEETING FEBRUARY 19, 2019 Agenda q Introductions q Flood Analysis qInundation Extents qFacility Overlays qAsset Matrix q Next Steps Analysis Actionable Strategies Rapid Inundation Analysis UF SLR Sketch Tool NOAA Coastal Flood Exposure Mapper Rapid Inundation Analysis •Run multiple events in one day •Combine SLR with varying rainfall events •Aids in knowledge transfer DEM Flood Extents Rapid Inundation Analysis q Inundation Extents Analyzed q100 Year q25 Year q2070 SLR (NOAA High) q2070 SLR (NOAA High) + 100 YR qCAT 1 Storm Surge qCAT 3 Storm Surge Rainfall Depths 100 Year Event 12 inches/24 hours 25 Year Event 9.5 inches/24 hours Data Sources: SJRWMD Tidal Information Data Source: NOAA, Station 8721604 Port Canaveral, FL Average MHHW taken from 2008 to 2018 (10 years) = 1.32 (NAVD) 2070 SLR (NOAA High) UF Sketch planning tool: 2070 SLR Indian River County Surge Map Indian River County City of Sebastian – Category 1 Surge RI tool CAT 1:NOAA Coastal Exposure Map CAT 1 (Bright Red): City of Sebastian – Category 3 Surge RI tool CAT 3:NOAA Coastal Exposure Map CAT 3 (Light Orange): Exposure VS. Vulnerability Asset Analysis q Asset Elevations qDEM (point) Elevation as FFE if no other information is available qAs Builts qLift Station As-Builts qGovernment Facilities Criticality qHigh – Impacts emergency or critical infrastructure needed during major events qMedium – Impacts infrastructure where individuals may work or live qLow – Impacts outdoor facilities qLift Stations Priority qHigh – More than 3’ of flood water – Impact to electrical equipment qMedium – More than 2’ of flood water – Possible impact to electrical equipment qLow – Under 2’ of flood water – Pumps will still remain in operation NOAA Societal Exposure NOAA Societal Exposure Next Steps q Submit Vulnerability Matrix – Flood Analysis qIdentify Master Pump Stations for criticality identification qSubmit Model Result Geodatabase (GDB) qSubmit Coastal Resiliency Plan Technical Memo qComprehensive Plan – Evaluation and Opportunity Assessment qComprehensive Plan – Resiliency Amendments Potential Adaptation Strategies q Update Stormwater Master Plan qUpdate Comprehensive Plan Elements City of Sebastian Vulnerability Assessment March 2019 APPENDIX D: NOAA COASTAL FLOOD EXPOSURE MAPS Coastal Flood Exposure Mapper Societal Exposure | Elderly Flood Hazard Composite 1 Hazard Zone 2 Hazard Zones 3 Hazard Zones 4 Hazard Zones 5 Hazard Zones 6 Hazard Zones 7 Hazard Zones 8 Hazard Zones 9 Hazard Zones 10 Hazard Zones 11 Hazard Zones Areas Not Mapped Percent Age 65 and Older 25.1% or more 15% to 25% 10.1% to 15% 5.1% to 10% 5% or less Unpopulated https://go.usa.gov/xEqBe Coastal Flood Exposure Mapper Societal Exposure | Elderly Storm Surge Scenarios Category 1 Category 2 Category 3 Category 4 Category 5 Levee Areas - Consult Local O cials For Flood Risk Areas Not Mapped Percent Age 65 and Older 25.1% or more 15% to 25% 10.1% to 15% 5.1% to 10% 5% or less Unpopulated https://go.usa.gov/xEqBz Coastal Flood Exposure Mapper Societal Exposure | Elderly Sea Level Rise Scenarios 1 Ft Above Current MHHW 2 Ft Above Current MHHW 3 Ft Above Current MHHW 4 Ft Above Current MHHW 5 Ft Above Current MHHW 6 Ft Above Current MHHW Levee Areas - Consult Local O cials For Flood Risk Areas Not Mapped Percent Age 65 and Older 25.1% or more 15% to 25% 10.1% to 15% 5.1% to 10% 5% or less Unpopulated https://go.usa.gov/xEqBJ Coastal Flood Exposure Mapper Societal Exposure | Population Density Flood Hazard Composite 1 Hazard Zone 2 Hazard Zones 3 Hazard Zones 4 Hazard Zones 5 Hazard Zones 6 Hazard Zones 7 Hazard Zones 8 Hazard Zones 9 Hazard Zones 10 Hazard Zones 11 Hazard Zones Areas Not Mapped People per Square Mile 45,001 or more people 15,001 to 45,000 people 7,501 to 15,000 people 2,501 to 7,500 people 501 to 2,500 people 500 people or less Unpopulated View Online Coastal Flood Exposure Mapper Societal Exposure | Population Density Storm Surge Scenarios Category 1 Category 2 Category 3 Category 4 Category 5 Levee Areas - Consult Local O cials For Flood Risk Areas Not Mapped People per Square Mile 45,001 or more people 15,001 to 45,000 people 7,501 to 15,000 people 2,501 to 7,500 people 501 to 2,500 people 500 people or less Unpopulated https://go.usa.gov/xEqBt Coastal Flood Exposure Mapper Societal Exposure | Population Density Sea Level Rise Scenarios 1 Ft Above Current MHHW 2 Ft Above Current MHHW 3 Ft Above Current MHHW 4 Ft Above Current MHHW 5 Ft Above Current MHHW 6 Ft Above Current MHHW Levee Areas - Consult Local O cials For Flood Risk Areas Not Mapped People per Square Mile 45,001 or more people 15,001 to 45,000 people 7,501 to 15,000 people 2,501 to 7,500 people 501 to 2,500 people 500 people or less Unpopulated https://go.usa.gov/xEqBu Coastal Flood Exposure Mapper Societal Exposure | Poverty Flood Hazard Composite 1 Hazard Zone 2 Hazard Zones 3 Hazard Zones 4 Hazard Zones 5 Hazard Zones 6 Hazard Zones 7 Hazard Zones 8 Hazard Zones 9 Hazard Zones 10 Hazard Zones 11 Hazard Zones Areas Not Mapped Percent Living Below Poverty Line 25.1% or more 15.1% to 25% 10.1% to 15% 2.1% to 10% 2% or less Unpopulated No Data https://go.usa.gov/xEqBM Coastal Flood Exposure Mapper Societal Exposure | Poverty Storm Surge Scenarios Category 1 Category 2 Category 3 Category 4 Category 5 Levee Areas - Consult Local O cials For Flood Risk Areas Not Mapped Percent Living Below Poverty Line 25.1% or more 15.1% to 25% 10.1% to 15% 2.1% to 10% 2% or less Unpopulated No Data View Online Coastal Flood Exposure Mapper Societal Exposure | Poverty Sea Level Rise Scenarios 1 Ft Above Current MHHW 2 Ft Above Current MHHW 3 Ft Above Current MHHW 4 Ft Above Current MHHW 5 Ft Above Current MHHW 6 Ft Above Current MHHW Levee Areas - Consult Local O cials For Flood Risk Areas Not Mapped Percent Living Below Poverty Line 25.1% or more 15.1% to 25% 10.1% to 15% 2.1% to 10% 2% or less Unpopulated No Data View Online