City of Delray Beach - Water Level Infrastructure ...

23
www.aptim.com City of Delray Beach Intracoastal Waterway Water Level & Infrastructure Vulnerability Study Submitted to: City of Delray Beach Submitted by: Aptim Environmental & Infrastructure, Inc. Project No. 631233074 October 2018

Transcript of City of Delray Beach - Water Level Infrastructure ...

  

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City of Delray Beach Intracoastal Waterway Water Level & Infrastructure Vulnerability Study Submitted to: City of Delray Beach Submitted by: Aptim Environmental & Infrastructure, Inc. Project No. 631233074 October 2018

1 Aptim Environmental & Infrastructure, Inc.

CITY OF DELRAY BEACH INTRACOASTAL WATERWAY

WATER LEVEL & INFRASTRUCTURE VULNERABILITY STUDY

1. EXECUTIVE SUMMARY

In recent years, the City of Delray Beach has experienced more frequent and increased flooding within its coastal communities, streets, parks, and other facilities that border the Intracoastal Waterway, primarily due to seasonal high tide events, commonly referred to as King Tides. Similar to other coastal Florida communities, the City seeks to assess its vulnerability to future seasonal flooding and to identify potential options to protect its infrastructure and citizen’s property, and has begun this work with the 2018 Intracoastal Waterway Water Level & Infrastructure Vulnerability Study.

In support of the City’s goals for this study, Aptim Environmental & Infrastructure, Inc. (APTIM) was retained to review available water level data, analyze return periods of extreme events, and consider sea level rise guidance to determine water level projections for the City’s requested 30-year and 75-year planning horizons. Based on the water level analyses performed in this study, it is recommended that the City use elevation 4.4 feet when planning for infrastructure improvements on a 30-year planning horizon.

Field investigations were performed to catalogue existing conditions of seawalls, stormwater inlets and outlets, and backflow prevention devices along approximately 4 miles of the ICW and the adjoining canals within the City’s study area in early 2018. Analyses of the collected field data were performed to support the City in assessing its vulnerability to future seasonal flooding and to identify options to protect its infrastructure and citizen’s property. To allow for additional analysis, all of the collected data was incorporated into an interactive geodatabase with hyperlinked videos, and observation reports.

The City is primarily vulnerable to coastal flooding due to low or unmaintained seawalls, and low or unprotected stormwater inlets under both private and public ownership. Considering the 30-year planning elevation of 4.4 ft., approximately 85% of waterfront parcels are vulnerable and require seawall raisings to prevent flooding, and 58 public stormwater inlets are vulnerable and unprotected by a backflow prevention device. Through analyses of current conditions and in consultation with City staff, the following recommendations for improving resilience to coastal flooding have been concluded from this study:

Implement seawall repairs and raisings to publically owned seawalls following the developed ranking table.

Systematically install backflow prevention devices, develop standards for maintenance of backflow prevention devices, and monitor for structural or hydraulic decay of the public stormwater system.

Perform public outreach and educate residents about the contributing factors to coastal flooding and develop guidelines for improvements to private seawalls and stormwater systems.

To guide implementation of seawall and stormwater system improvements by private residents, the City may develop ordinances to mandate elevations and timing of improvements to improve resiliency to coastal flooding City-wide. In pursuing a City Guided Implementation method, the City should weigh the benefits of implementing a time specific resiliency goal versus allowing for ongoing sea level rise and recurring storms to trigger improvements.

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SEAWALL ELEVATION (FT., NAVD88)STUDY AREA

PARCELS

<22.0 - 2.52.5 - 3.0 3.9 - 7.9

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SE

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SEAWALL ELEVATION (FT., NAVD88)STUDY AREA

PARCELS

<22.0 - 2.52.5 - 3.0 3.9 - 7.9

3.5 - 3.93.0 - 3.5

Seabreeze Ave

S M

allo

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allo

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allo

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SEAWALL ELEVATION (FT., NAVD88)STUDY AREA

PARCELS

<22.0 - 2.52.5 - 3.0

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Lain

g S

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NOTES:1. DATES OF SURVEY: JANUARY 22 - MAY 22, 2018 2. COORDINATES ARE IN FEET BASED ON THE FLORIDA PLANE COORDINATE SYSTEM, EAST ZONE, NORTH AMERICAN DATUM (NAD) 1983/2011.3. ELEVATIONS ARE IN FEET BASED ON THE NORTH AMERICAN VERTICAL DATUM (NAVD) 1988.4. AERIAL PHOTOGRAPHY IS THE PALM BEACH COUNTY IMAGE SERVICE, COLLECTED BETWEEN JANUARY 5 AND FEBRUARY 10, 2017.5. PALM BEACH COUNTY PARCELS DOWNLOADED FROM PALM BEACH COUNTY GIS DEPARTMENT.

SEAWALL ELEVATION (FT., NAVD88)STUDY AREA

PARCELS

<22.0 - 2.52.5 - 3.0 3.9 - 7.9

3.5 - 3.93.0 - 3.5

EstuaryWay

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lvd

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mar

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Lake Trl

Mc

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NOTES:1. DATES OF SURVEY: JANUARY 22 - MAY 22, 2018 2. COORDINATES ARE IN FEET BASED ON THE FLORIDA PLANE COORDINATE SYSTEM, EAST ZONE, NORTH AMERICAN DATUM (NAD) 1983/2011.3. ELEVATIONS ARE IN FEET BASED ON THE NORTH AMERICAN VERTICAL DATUM (NAVD) 1988.4. AERIAL PHOTOGRAPHY IS THE PALM BEACH COUNTY IMAGE SERVICE, COLLECTED BETWEEN JANUARY 5 AND FEBRUARY 10, 2017.5. PALM BEACH COUNTY PARCELS DOWNLOADED FROM PALM BEACH COUNTY GIS DEPARTMENT.

SEAWALL ELEVATION (FT., NAVD88)STUDY AREA

PARCELS

<22.0 - 2.52.5 - 3.0 3.9 - 7.9

3.5 - 3.93.0 - 3.5

APPENDIX E

RAPID SEAWALL ASSESSMENT

Commodo

re Cir

CommodoreCir

AdmiralsWay

Com

mod

ore

Cir

Spa

nish

Trl S

Harbor Cir

Aven

ue F

Admirals Way

Aven

ue G

Bosun Cir

CaptainsWalk

La M

at A

ve

Aven

ue H Tr

opic

Isle

Dr

PelicanPointe Dr

Aven

u e L

Iris

Dr

Frederick Blvd

Jasm

ine

Dr

Spanish Trl

Boone Dr

Jasmine Ct

Spa

nish

CirJasmine Ter

Frederick Blvd

Ensi

gn C

irP

elic

an W

ay

Gar

deni

a D

r

Fern

Dr

Eve

rgre

en D

r

Florida Blvd

Hya

cint

h D

r

S Ocean Blvd

Che

cked

by:

D

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RAPID STRUCTURAL ASSESSMENT

GOOD

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SATISFACTORYCRITICAL

SERIOUS

POOR

STUDY AREA

P

P

PUBLICP

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S Federal Hwy

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Spanish Trl

Spanish TrlBan

yan

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a G

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ns R

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Florida Blvd

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NOTES:1. DATES OF SURVEY: MARCH 8 AND 14, 2018 2. COORDINATES ARE IN FEET BASED ON THE FLORIDA PLANE COORDINATE SYSTEM, EAST ZONE, NORTH AMERICAN DATUM (NAD) 1983/2011.3. SEAWALL CLASSIFICATIONS CONSISTENT WITH ASCE UNDERWATER CONDTION ASSESSMENT RATINGS (2011).4. AERIAL PHOTOGRAPHY IS THE PALM BEACH COUNTY IMAGE SERVICE, COLLECTED BETWEEN JANUARY 5 AND FEBRUARY 10, 2017.5. PALM BEACH COUNTY PARCELS DOWNLOADED FROM PALM BEACH COUNTY GIS DEPARTMENT.

RAPID STRUCTURAL ASSESSMENT

GOOD

FAIR

SATISFACTORYCRITICAL

SERIOUS

POOR

STUDY AREA

PP

P

P

PUBLICP

SE

9th

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2481

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NOTES:1. DATES OF SURVEY: MARCH 8 AND 14, 2018 2. COORDINATES ARE IN FEET BASED ON THE FLORIDA PLANE COORDINATE SYSTEM, EAST ZONE, NORTH AMERICAN DATUM (NAD) 1983/2011.3. SEAWALL CLASSIFICATIONS CONSISTENT WITH ASCE UNDERWATER CONDTION ASSESSMENT RATINGS (2011).4. AERIAL PHOTOGRAPHY IS THE PALM BEACH COUNTY IMAGE SERVICE, COLLECTED BETWEEN JANUARY 5 AND FEBRUARY 10, 2017.5. PALM BEACH COUNTY PARCELS DOWNLOADED FROM PALM BEACH COUNTY GIS DEPARTMENT.

RAPID STRUCTURAL ASSESSMENT

GOOD

FAIR

SATISFACTORYCRITICAL

SERIOUS

POOR

STUDY AREA

P

P P PP

P

PUBLICP

Seabreeze Ave

S M

allo

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allo

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NE 6th Ave

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allo

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SE

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SE

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7720

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NOTES:1. DATES OF SURVEY: MARCH 8 AND 14, 2018 2. COORDINATES ARE IN FEET BASED ON THE FLORIDA PLANE COORDINATE SYSTEM, EAST ZONE, NORTH AMERICAN DATUM (NAD) 1983/2011.3. SEAWALL CLASSIFICATIONS CONSISTENT WITH ASCE UNDERWATER CONDTION ASSESSMENT RATINGS (2011).4. AERIAL PHOTOGRAPHY IS THE PALM BEACH COUNTY IMAGE SERVICE, COLLECTED BETWEEN JANUARY 5 AND FEBRUARY 10, 2017.5. PALM BEACH COUNTY PARCELS DOWNLOADED FROM PALM BEACH COUNTY GIS DEPARTMENT.

RAPID STRUCTURAL ASSESSMENT

GOOD

FAIR

SATISFACTORYCRITICAL

SERIOUS

POOR

STUDY AREA

P

P

P

P

PUBLICP

Lain

g S

t

Geo

rge

Bus

h B

lvd

PalmTrl

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NE

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St

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in D

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NOTES:1. DATES OF SURVEY: MARCH 8 AND 14, 2018 2. COORDINATES ARE IN FEET BASED ON THE FLORIDA PLANE COORDINATE SYSTEM, EAST ZONE, NORTH AMERICAN DATUM (NAD) 1983/2011.3. SEAWALL CLASSIFICATIONS CONSISTENT WITH ASCE UNDERWATER CONDTION ASSESSMENT RATINGS (2011).4. AERIAL PHOTOGRAPHY IS THE PALM BEACH COUNTY IMAGE SERVICE, COLLECTED BETWEEN JANUARY 5 AND FEBRUARY 10, 2017.5. PALM BEACH COUNTY PARCELS DOWNLOADED FROM PALM BEACH COUNTY GIS DEPARTMENT.

RAPID STRUCTURAL ASSESSMENT

GOOD

FAIR

SATISFACTORYCRITICAL

SERIOUS

POOR

STUDY AREA

P

PP

PP

P

P P

P

P

P

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P

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mar

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d W

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NE 9th Ave

Estu

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Mc

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7820

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2000

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962000

NOTES:1. DATES OF SURVEY: MARCH 8 AND 14, 2018 2. COORDINATES ARE IN FEET BASED ON THE FLORIDA PLANE COORDINATE SYSTEM, EAST ZONE, NORTH AMERICAN DATUM (NAD) 1983/2011.3. SEAWALL CLASSIFICATIONS CONSISTENT WITH ASCE UNDERWATER CONDTION ASSESSMENT RATINGS (2011).4. AERIAL PHOTOGRAPHY IS THE PALM BEACH COUNTY IMAGE SERVICE, COLLECTED BETWEEN JANUARY 5 AND FEBRUARY 10, 2017.5. PALM BEACH COUNTY PARCELS DOWNLOADED FROM PALM BEACH COUNTY GIS DEPARTMENT.

GOOD

FAIR

SATISFACTORYCRITICAL

SERIOUS

POOR

RAPID STRUCTURAL ASSESSMENT

STUDY AREA

PUBLICP