The URL can be used to link to this page

04-24-2023 - Hurricane Workshop Back UpEnvironmental Services Department April 24, 2023 Randy Coslow, P.E., Department Director and City Engineer Topics to be Discussed 1.Hurricanes Ian & Nicole (2022): Severity & Impacts 2.Surface Waters & Canal System Inventory 3.Hurricane Response, Debris Removal 4.Stormwater Maintenance Maps 5.Stormwater Master Plan 6.Discuss Gravity vs Pump Systems 2 Canal & Stormwater Maintenance Front yard systems and inlets Retention and detention areas Canal system and control structures in both back yards and right-of-ways Our outfalls-connections to rivers or other drainage systems 3 Preparing for Storm Season… Review & update of Debris Management Plan Pre-Disaster authorization for DDMS Debris Management Task Force Logistical review and coordination of equipment & staff staging Competitive bid process for storm debris monitors & haulers Annual meeting with debris monitors & haulers Canals are cleaned bi-annually and surveyed at the threat of storms 4 Topics to be Discussed 1.Hurricanes Ian & Nicole (2022): Severity & Impacts 5 Storm Surge and Tidal Influence Storm surge and tides Our stormwater outfalls 18th Street Canal Gabordy Canal Ariel Canal Turnbull Hammock Rain fall 6 Tides and Storm Surge +/-900 homes flooded in IAN +/-12 homes flooded in NICOLE Storm Surge from IAN = 6ft EL (3ft over High Tide) Storm Surge from NICOLE = 6ft EL (same as IAN) 7 Flooded Properties –Hurricane Ian 8 +/-900 homes Flooded North NSB 1924 Flooding: 23”/24hr 9 NSB 1924 Flooding: 23”/24hr 10 Topics to be Discussed 1.Hurricanes Ian & Nicole (2022): Severity & Impacts 2.Surface Waters & Canal System Inventory 11 Surface Water in Edgewater 12 Gabordy Canal 18th Street Canal (Florida Shores) Turnbull Hammock Swamp Towards North Indian River Lagoon Ariel Canal(Towards River Breeze Park) To Ponce Inlet North There are approx. 1,300 properties adjacent to canals in FL Shores Approx. 14.6 miles of canal (x2 banks = 30 miles of sodded slope to maintain). Florida Shores Canals 13 North Constructed in the 1960’s 14North Constructed in the 1960’s 15 North Topics to be Discussed 1.Hurricanes Ian & Nicole (2022): Severity & Impacts 2.Surface Waters & Canal System Inventory 3.Hurricane Response, Debris Removal 16 During & Immediate Post Storm Response Staffing of emergency operations center Dispatch response to trees blocking roads and the investigation of flooding High water alarms at lift stations Clearing of roads and any blocked drainage structures Post storm survey of stormwater system Post storm survey of storm debris 17 Priority of Debris Clearance Ability to Extricate People Major Flooding Drainage Arteries Egress For Fire, Police, and Emergency Operations Center Major Traffic Routes US-1 and SR-442 Government Facilities Secondary Roads to Neighbor Collection Points Riverside Dr. 30th St. Park Ave. Air Park Rd. Silver Palm Dr. Access For Utility Restoration Neighborhood Streets 18 Debris Clean up and Restoration •Process –Initial Survey –1st Pass, 2nd Pass, etc. –Black bags –Daily monitoring by both contractor and staff –Potential additional passes –PPDR •Outside contractors –Monitors and Haulers 19 Debris Classifications Most Common Hurricane Debris 30% clean woody material 70% construction & demolition (C&D) Ineligible Debris Chemicals Petroleum products Paint products Asbestos Any material that is classified as hazardous or toxic waste 20 21 No Black Bags for Hurricane Debris Debris Status 22 First pass complete: 1,809 Loads 78,070 CY of debris Second pass complete: 458 Loads 34,736 of debris October 6, 2022 Thru December 9,2022 23Data as of Sunday, November 27, 2022 Debris Status Topics to be Discussed 1.Hurricanes Ian & Nicole (2022): Severity & Impacts 2.Surface Waters & Canal System Inventory 3.Hurricane Response, Debris Removal 4.Stormwater Maintenance Maps 24 Stormwater Maintenance Maps 25 Stormwater Maintenance Maps 26 Stormwater Maintenance Maps 27 Topics to be Discussed 1.Introduce Environmental Services Department 2.Hurricanes Ian & Nicole (2022): Severity & Impacts 3.Surface Waters & Canal System Inventory 4.Hurricane Response, Debris Removal 5.Canal Maintenance Maps 6.Stormwater Master Plan 28 Stormwater Master Plan Hydraulic & Hydrology Studies (aka Models) focus on Water Quantity and Flooding: 2005 Gabordy Canal Watershed Stormwater Management Plan (PEC) 2007 18th Street Canal and Silver Palm Canal Watershed Stormwater Management Plan (PEC) 2007 Edgewater Stormwater Master Plan Capital Improvement Plan (PEC) 2008 Ariel Canal Study (QLH) –Suspended/Incomplete 2010 –2013 Brown Tide & Marine Mammal Deaths in IRL changed focus to Water Quality and Treatment 2013 Stormwater Master Plan Update & CIP (QLH) –Focus on treating direct runoff to Indian River (i.e. East of US-1) 2019 Mosquito Lagoon Reasonable Assurance Plan (JEA) G2/G11 Canal Improvements –Grant $14.7M, Engineer proposal 6/5 agenda 29 Stormwater Master Plan Requesting $1.2M funding in FY2023-2024 for a Comprehensive Edgewater Stormwater Master Plan H&H Models of all watersheds, calibrated to the impacts of Hurricanes Irma (2017), Ian (2022) and Nicole (2022) Turnbull Hammock Swamp –never modeled, important to effectively regulate new growth, NIRL BMAP Need recommendations for both Quantity and Quality Finalize Ariel Canal study Vulnerability Assessment (Grant Funded) Comprehensive Plan Amendments 30 Topics to be Discussed 1.Introduce Environmental Services Department 2.Hurricanes Ian & Nicole (2022): Severity & Impacts 3.Surface Waters & Canal System Inventory 4.Hurricane Response, Debris Removal 5.Canal Maintenance Maps 6.Stormwater Master Plan 7.Discuss Gravity vs Pump Systems 31 What about Storm Pumps? To be analyzed in Master Plan Not City-wide, but specific areas/neighborhoods Pre -Storm Dewatering vs During Storm Discharge 32 Questions? 33 Gabordy Canal 18th Street Canal (Florida Shores) Turnbull Hammock Swamp Towards North Indian River Lagoon Ariel Canal(Towards River Breeze Park) To Ponce Inlet North 4/25/23, 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor FLOOD RISK OVERVIEW Does Edgewater have risk? Moderate F L 0 0D F A C T O R There are 3,133 properties in Edgewater that have .................... greater than a 26% chance of being severely affected by flooding over the next 30 years. This represents 44% of all properties in Edgewater. In addition to damage on properties, flooding can also cut off access to utilities, emergency services, transportation, and may impact the overall economic well-being of an area. Overall, Edgewater has a moderate risk of flooding over the next 30 years, which means flooding is likely to impact day-to-day life within the community. This is based on the level of risk the properties face rather than the proportion of properties with risk. Edgewater Flood Risk Residential Moderate Risk https://riskfactor.com/city/edgewater-fl/l219825_fsid/flood 1/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor 4,131 out of 9,334 homes Q Road Minor Risk 138 out or 221 miles of roads (D Commercial Minor Risk 217 out of 539 commercial properties 0 Critical Infrastructure Moderate Risk 3 OUt of 6 infrastructure facilities Q Social Facilities Minor Risk 6 out of 14 social facilities Q Minor Moderate Major Severe Extreme h 1 ,k, �H \ "4.I W S UrVG� Y'L i t L p «r ;r-dit CURRENT PROTECTIONS Is Edgewater protected from flooding? Although flood risk can never be completely eliminated, communities that adapt to higher flood risks can limit flood damage and lower flood insurance costs. Learn more about solutions. https://riskfactor.com/city/edgewater-fl/1219825 fsid/flood 2/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor@ Report I Risk Factor Adaptation measures 0 0 Known adaptation Properties measures 0 protected by adaptation Q WHERE TO START How can communities begin to protect themselves? Lowering flood risk starts with higher standards. Some places plan to a higher standard (a "500 year" standard) that lowers the number of properties at severe risk. Protecting homes to this level would reduce the risk to the 3,133 severely affected properties. % chance of % chance of Flood event flooding in a given flooding over 30 year years 100 year 1% 26% 500 year .2% 6% hftps://riskfactor.com/city/edgewater-fl/1219825_fsid/flood 3/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor CURRENT & FUTURE RISK How will Edgewater's risk change? Deeper floods from major events, like hurricanes, are less likely to occur, but affect more properties than more shallow flood events, like heavy rains. As Edgewater feels the effects of a changing environment, however, events of all kinds will affect more properties within the community. If a low -likelihood storm resulting in severe flooding (a 1 -in -100 year flood event), occurred ............................................. today, it could affect 2,484 properties in Edgewater. This type of event has a 26% chance of occurring at least once over the life of a 30 year mortgage. 30 years from now, an event of this same likelihood would affect 3,169 properties due to a changing environment. Properties at risk 2,484 Today 0 3,169 In 30 years 0 0 0.5 1 Depth of flooding (ft.) This year A 2 3+ ► In 30 years https://riskfactor.com/city/edgewater-fl/1219825 fsid/Flood 4/11 4/25/23. 3:20 PM Edgewater, Florida Flood Factor0 Report I Risk Factor HISTORIC FLOODS Are there past examples? Based on a recreated model of the flood, 16 ............................. properties were impacted by Hurricane Irma's storm surge in September, 2017. Hurricane Irma: September 2017 00 Properties impacted in Edgewater0 0 0.5 1 2 3+ Depth of flooding (ft.) O https://riskfactor.com/city/edgewater-fl/l 219825_fsid/flood 5/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor ENVIRONMENTAL CHANGES Why is risk changing? A changing environment means higher seas, new weather patterns, and stronger storms. As the atmosphere warms, there is more evaporation and more water available when it rains. A warmer atmosphere also means warmer oceans, which can intensify flooding from hurricanes and offshore storms. Sea level rise also increases coastal flood risks, as higher seas mean there's more water available when high tides and coastal storms cause flooding. Learn more about the environmental factors increasing flood risk here. r' w Precipitation Change Sea Level Rise Sea Surface Temperatures https://riskfactor.com/city/edgewater-fl/1219825 fsid/flood 6/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor This year In 15 years In 30 years Change in extreme rain events compared to 1980- 2010 average. Q Change in extreme rain events compared to 1980- 2010 average. —LIGHTER HEAVIER- -10% -5% 0% 5% 10% Source: NASA Earth Exchange Global Daily Downscaled Projections (NEX-GDDP). COMMUNITY SOLUTIONS What else can communities do? Individuals, mayors, governors, and Congress can work together to build protections before flooding, build back stronger after flooding, and create plans that future -proof communities. https://riskfactor.com/city/edgewater-fl/1219825_fsid/flood 7/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor Green Green infrastructure is a cost-effective and sustainable flood management approach that gathers and removes water at its source. Grey Grey infrastructure uses concrete or steel structures to control flooding. These engineered structures are costly, take time to build, and require regular maintenance. https://riskfactor.com/city/edgewater-fl/1219825 fsid/flood 8/11 4/25/23. 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor Resilience Resilience measures are community -wide, non- structural strategies that help people bounce back more quickly after floods. Explore more solutions here. OTHER RISKS What are my other risks? In addition to the flooding risk described above, Edgewater has major risk from wildfires, extreme risk from heat and extreme risk from severe winds. To learn more details about Edgewater's risk and solutions visit this area's Risk Factor@ pages below. https://riskfactor.com/city/edgewater-fl/1219825_fsid/flood 9/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor® Report I Risk Factor Major F I R E F A C T O qR 11,191 properties in Edgewater have some risk of being in a wildfire within the next 30 years. Extreme H E A T F ACT 0 R Edgewater is expected to see 185.7% increase in the number of days over 105°F over the next 30 years. Extreme W I N D F A C T O R https://riskfactor.com/city/edgewater-fl/l 219825_fsid/flood 10/11 4/25/23, 3:20 PM Edgewater, Florida Flood Factor@ Report I Risk Factor 11,191 properties in Edgewater have some risk of being in a severe wind event within the next 30 years. https://riskfactor.com/city/edgewater-fl/1219825_fsid/flood 11/11