Flood Resilience Zoning Text Update Throggs Neck Homeowners Association
September 26, 2017 Hurricane Sandy
Port Morris Source: dna.info Harding Park Source: Bronx Ink
Source: Bronx Ink Hunts Point Locust Point Source: Daily News 3 Flood Resilience Zoning Projects at DCP
RESILIENT INDUSTRY
2018
2013 2018 “Flood Text” “Flood Text Update” initial temporary regulations improve upon, and make to facilitate recovery permanent, the Flood Text
4 DCP Resilient Neighborhoods Outreach Summary
Late 2013 Kick off of Harding Park and August 2014 Ongoing DCP coordinates interagency Edgewater Park studies DCP coordinates with workshops with DCP and the Edgewater Park and Early 2014 Mayor’s Office of Resiliency Harding Park Engagement of and Recovery October 2015 stakeholders and leadership in Harding leadership to advance and Edgewater park Summary reports are released resiliency measures on and identification of private and public neighborhood-scale levels challenges 5 Citywide Flood Risk NYC’s flood risk is high and it will only continue to increase.
100 year 2050s (1% annual 2015 Projected chance) PFIRMS FIRMS floodplain Residents 400,000 808,900 Buildings 71,500 118,000
Buildings: Residential 80% 1-4 units Units: 7% 5+ units 30% 1-4 units 13% nonresidential 70% 5+ units
50 of 59 Community Boards Map analysis based on Preliminary Flood Insurance Rate Maps (PFIRMS) 45 of 51 Council Districts Future flood zone impacts based on NPCC2 90th percentile sea level rise projections 6 Bronx Flood Risk
A significant portion of the Bronx’s critical infrastructure and institutions, building stock, and population is located in the 100 year floodplain.
100 year 2050s (1% annual 2015 Projected chance) PFIRMS FIRMS floodplain Residents 16,700 41,900 Buildings 3,900 8,400
Map analysis based on Preliminary Flood Insurance Rate Maps (PFIRMS) Future flood zone impacts based on NPCC2 90th percentile sea level rise projections 7 Bronx CB 10 Flood Risk
Community District 10 is one of the most vulnerable in the Borough with 60% of the Bronx’s floodplain population and nearly 80% of floodplain building stock.
100 year 2050s (1% annual 2015 Projected chance) PFIRMS FIRMS floodplain Residents 10,100 17,800 Buildings 3,100 5,200
Map analysis based on Preliminary Flood Insurance Rate Maps (PFIRMS) Future flood zone impacts based on NPCC2 90th percentile sea level rise projections 8 Bronx Flood Risk Land use + Common Building Typologies
Open Space & Parking Vacant No Data Outdoor Recreation Facilities Land 1% 3% 3% 12%
Public Facilities & Institutions <1% One & Two Family Buildings Transportation 66% & Utility 3%
Industrial & Manufacturing 6%
Commercial & Office Buildings Mixed 1% Commercial & Multifamily Residential Buildings Buildings 3% 2% % Tax lots Analysis based on 2014 PLUTO data 9 Bronx Flood Risk Land use + Common Building Typologies
One & Two Multifamily Mixed No Data Family Buildings Buildings Commercial & 3% 18% 2% Residential Buildings 2% Vacant Land 27% Commercial & Office Buildings 2%
Industrial & Parking Manufacturing Facilities 22% 5% Transportation Open & Utility Space & 4% Outdoor Public Recreation Facilities & 15% Institutions % Acres <1% Analysis based on 2014 PLUTO data 10 How are buildings in the floodplain regulated?
Flood Insurance Rate Building Code Maps (FIRMs) (DOB)
Determine where floodplain Requires new buildings and regulations apply substantial improvements to meet FEMA standards National Flood Insurance Program Zoning Resolution (DCP) Set up Insurance Rates depending on building elevation Zoning accommodates these and other requirements regulations and improves Construction neighborhood character Standards (ASCE 24)
Design minimum construction requirements for flood hazard areas 11 Flood resilient construction Building Code Required by DOB (DOB) Requires new buildings and substantial improvements to meet FEMA standards
Required Not required for existing buildings for all new buildings (unless substantially damaged or improved)
12 Flood resilient construction Terms
A building’s Base Flood Elevation (BFE) and Design Flood Elevation (DFE) affect the regulatory and building code requirements and may have an impact on flood insurance premiums.
The expected height of flooding from the 1% annual chance flood for each flood zone, is known as the Base Flood Elevation (BFE). DFE First occupiable floor
BFE Freeboard The Design Flood Elevation (DFE) is the height of the lowest inhabited floor.
Additional height between the BFE and the DFE is known as freeboard.
13 Flood resilient construction Required by DOB
Flood resilient construction Living spaces standards require certain buildings are elevated to elevate the lowest floor, as well above DFE as mechanical equipment, above Mechanical systems the Design Flood Elevation (DFE). are elevated above DFE
DFE
Site is filled to lowest adjacent grade WET FLOODPROOF (Water comes in and out)
Use below DFE is restricted to parking, storage or access 14 Flood resilient construction Required by DOB
Flood resilient construction standards Unit 4 require certain buildings to elevate the
lowest floor, as well as mechanical Unit 3 Living spaces equipment, above the Design Flood are elevated above DFE Elevation (DFE). Unit 2
Mechanical systems Unit 1 are elevated above DFE
Residential Lobby DFE WET-FLOODPROOF
Site is filled to lowest adjacent grade
15 Flood insurance rates Set by FEMA
Raising or retrofitting your building or home will reduce costs
FEMA’s flood insurance premiums are lowest when the lowest inhabited floor (any area not used solely for storage, access or parking) is elevated above the Base Flood Elevation (BFE).
~$450 ~$1,400 Annual premium ~$9,000 Annual premium Annual premium BFE
4 FEET OR MORE AT 3 FEET OR MORE BELOW BFE BFE ABOVE BFE 16 2013 Citywide Flood Text Amended zoning in six key areas
1 2 3 Height Access Parking Measured from Flexibility for Flexibility to flood elevation stairs, ramps, lifts relocate parking
4 5 6 Systems Ground Floors Streetscape Flexibility to Account for costs Require features to relocate/elevate of new flood risk mitigate blank wall
17 Flood Text Update Need for a new citywide text amendment
1 2 3 Make the provisions of Fix and improve Begin to promote new the current, temporary provisions based on development + proactive 2013 Flood Text studies, lessons retrofitting to high permanent learned, and outreach resiliency standards
18 Flood Text II Zoning and land use strategies
Where flood risk is exceptional, Where risk from extreme events including where sea level rise will can be managed and infrastructure lead to future daily tidal flooding. and context support growth.
Flood risk and local planning considerations
Limit Accommodate Encourage Zoning and other tools should Adjust zoning to allow buildings to Encourage construction of new limit exposure to damage and retrofit, by providing flexibility and development built to a higher disruption by limiting the removing obstacles to resiliency standard of flood protection. density of future development. investments.
*stakeholder input factored into zoning and land-use strategy throughout
19 Flood Text II Zoning Resolution Fix and improve provisions based on lessons (DCP) learned
1 2 3 Height Height Ground Floors Homeowners may Property owners Current incentives to face the loss of may want to keep active ground subgrade spaces address future risk floors may not be when retrofitting by over-elevating enough
4 5 6 Homes in M Old Homes in Improve Districts Small Lots Streetscape Existing homes in M. Old homes on small lots Mitigate the effects of Districts, if damaged, may need more flexibility elevated buildings on may not be able to to rebuild in the future neighborhood character rebuild
20 Flood Text Update Outreach
DCP has planned a robust public engagement process:
2016 2017 2018 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Community Outreach Scoping / ULURP
As part of this outreach process, DCP will: • Partner with stakeholders to educate and promote awareness of flood risk and resiliency issues • Explain how zoning tools relate to resiliency • Explore unique neighborhood issues through in-depth public presentations and workshops • Develop a proposal through an iterative process that is shaped by feedback
* Schedule is tentative and subject to change 21 Outreach Resources
NYC Flood Hazard Mapper www.nyc.gov/floodhazardmapper
Info briefs on Flood Resilience Zoning, Flood Risk, Flood Resilient Construction, and Flood Insurance www.nyc.gov/resilientneighborhoods
22 Thank you!
For more information, and to stay involved, email [email protected] [email protected]
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