LTC 567-2019 King Tide Season SummaryMIAMI BEACH
OFFICE OF THE CITY MANAGER
NO. LT G # 567-2019 LETIER TO COMMISSION
TO : Mayor Dan Gelber and Members o
DATE : October 24, 2019
SUBJE CT: King Tide Season Summary
Reducin rg f lood risk is of high importance to residents, as demonstrated in the resident
survey a1nd an important priority of our strategic plan. I'm pleased to share that we are
now ho Miing all-hands on deck after-action reviews for any type of event that may cause
types offl ooding as a result of extreme rainfall, high tides, or storms. This is especially
importa111t considering Miami Beach's low topography and sea level rise projections.
An afte r-·<a ction review is a usefut fact-based analysis to understand and document
conditions, what went welt and
recommendations for improvement.
By understanding the environmental
conditions and areas of impact, we
can better assess the effectiveness of
our resilience efforts ranging from
public infrastructure improvements
to land use amendments. Staff
presented an overview of the May
17, 2019 heavy rainfall event at the
Septem b(er 26, 2019 Sustainability and Resiliency Committee (the item had been
deferre d! f or a few months). Staff was prepared to discuss the most recent King Tide
summa r y f or Item R9 I on the October 16, 2019 City Commission agenda; however the
item wa s deferred. Attachment 1 includes the presentation that was prepared for Item
R9 I.
In sum m ar y:
• li cle s were about a foot higher than predicted, reaching 2.18 feet on Oct. 1 and
ne aching 1.5 feet or higher the rest of days (Sept. 26-0ct. 3).
• Al l stormwater pumps worked effectively. In areas of low elevation (not yet
imp roved) temporary pumps were deployed to alleviate flood risk where
possib l e.
• Th e ar eas that were affected the most by this event were: Indian Creek, North
Bay Road, North Beach and Commerce Street .
• 18 flood/drainage requests were made to the Public Works control room.
• Approximately 200 standing water/flooding events captured by staff through
Crisis Track (our emergency management tracking system) on Sept. 30. The city
has further categorized flooding types for better analysis, and they include:
o 71 standing water (minor puddle or standing water that do not present a
risk to pedestrians, property owners or vehicular traffic)
o 80 significant standing water (partial roadway blockage that presents
inconveniences to pedestrians and vehicles. Reasonable drainage time
frame expectedL and
o 45 stormwater flooding (causing a complete obstruction of vehicular and
pedestrian traffic on one or more low-lying streets in addition to
impacting low-lying properties). This is comparable to the NOAA minor or
moderate flooding definitions.
NOAAINOS/CO..OP S
Observed Water Levels at 8723214, Virginia Key, Biscayne Bay FL
From 2019/09/26 00:00 LSTILDT to 2019/10/03 23:59 LST/LDT 4.0 .--------------------------------,4.0
3.0
6 2.0
~
-1.0 ~
~ 0.0 ,
.c
C)
~ -1.0
-2 .0
00:00
9 /26
-2.0
NOAA NOS Center t oT Operational Ocunogra phlt Products-a.'nd Services
0000
9 /27
00:00
9 128
0000
9 /29
00:00
9 30
-Predictions -Verified -Observed -Forecast Guidance
00:00
10/1
oo·oo
1012
oo·oo
10/3
• Staff is now assessing results for completed and active projects, both visually and
through data. In all areas of complete or nearly completed projects, no King Tide
flooding was observed. In Sunset Harbour, 31 potential tidal flooding events
have been avoided to-date to 2019. Avoided flooding is an assumption made by
using data comparing tidal gauge data, the former road elevation, and the raised
road elevation. Photos are included in the attachment.
• Staff will also begin assessing vulnerable neighborhoods that have not had public
infrastructure improvements during King Tide events going forward.
• We are not aware of any private property damage .
The review was organized by the CRO team, true to the role of convening and
supporting operations from all departments to address our shocks and stresses. The
review was led by the City Manager, with participation of Assistant City Manager, Public
Works Engineering and Operations, Capital Improvement Projects, Emergency
Management, the Building Floodplain Manager, Planning, and Communications.
Attachment 2 contains the presentation used to facilitate the after-action review.
Staff is using the best data available-ranging from the city's tidal gauges to complaints
from the control room, to monitoring inspections conducted by staff, with a spatially
based analysis supported by GIS. The team is combining multiple automated data
systems in a utilizing a Power Bl dashboard funded with seed money from Bloomberg
Philanthropies competition.
This analysis will allow us to better understand and respond to events-to connect the
dots. Ultimately, the documentation and coordination will help provide the Commission
information needed to make policy-level decisions.
I am very pleased with the collaboration among departments and the collection of
actionable and practical data to inform future decision making. If you have any
questions, please contact Susanne Torriente, Assistant City Manager/Chief Resilience
Officer, or Amy Knowles, Deputy Resilience Officer.
Attachment 1-King Tide Photo Presentation
Attachment 2-King Tide After Action Presentation
JLM/SMT/AK
PUBLIC WORKS DEPARTMENTPUBLIC WORKS DEPARTMENT
PUBLIC WORKS DEPT
Before & After Elevation and
Drainage Improvements
Side-by-Side Comparisons
October 16, 2019
PUBLIC WORKS DEPARTMENT
<< 2 >>Flood Mitigation Results Purdy Ave and Dade Blvd
AFTERBEFORETides: 1.27 ft NAVD | 10/11/11 Tides: 1.88 ft NAVD | 10/15/19
PUBLIC WORKS DEPARTMENT
<< 3 >>Flood Mitigation Results Purdy Ave and 20th Street
BEFORE Tides: 1.27 ft NAVD | 10/11/11 Tides: 1.88 ft NAVD | 10/15/19AFTER
PUBLIC WORKS DEPARTMENT
<< 4 >>Flood Mitigation Results Purdy Ave and Dade Blvd
BEFORE Tides: 1.27 ft NAVD | 10/11/11 Tides: 1.88 ft NAVD | 10/15/19AFTER
PUBLIC WORKS DEPARTMENT
<< 5 >>Flood Mitigation Results Purdy Ave -North of Dade Blvd
BEFORE Tides: 1.88 ft NAVD | 10/29/12 Tides: 1.88 ft NAVD | 10/15/19AFTER
PUBLIC WORKS DEPARTMENT
<< 6 >>Flood Mitigation Results Purdy Ave -South of 18th Street
BEFORE Tides: 1.27 ft NAVD | 10/11/11 Tides: 1.88 ft NAVD | 10/15/19AFTER
PUBLIC WORKS DEPARTMENT
<< 7 >>Flood Mitigation Results 18th Street and Bay Road
AFTERBEFORETides: 1.27 ft NAVD | 10/11/11 Tides: 1.88 ft NAVD | 10/15/19
PUBLIC WORKS DEPARTMENT
<< 8 >>Flood Mitigation Results Palm Island 316 South Coconut Ln
BEFORE AFTERTides: 1.4 ft NAVD | 10/17/12 Tides: 1.88 ft NAVD | 10/15/19
PUBLIC WORKS DEPARTMENT
<< 9 >>Flood Mitigation Results Palm Island 303 North Coconut Ln
BEFORE AFTERTides: 1.4 ft NAVD | 10/17/12 Tides: 1.88 ft NAVD | 10/15/19
PUBLIC WORKS DEPARTMENT
<< 10 >>Flood Mitigation Results West Ave and 6th Street
BEFORE AFTERTides: 1.4 ft NAVD | 10/17/12 Tides: 1.88 ft NAVD | 10/15/19
PUBLIC WORKS DEPARTMENT
<< 11 >>NOAA Water Elevations Virginia Key, Biscayne Bay
AFTER
10/15/19
PUBLIC WORKS DEPARTMENT
<< 12 >>Avoided 60 Tidal Flooding Incidents
Due to Road Raising
January 2017 -Present
July 2017 Jan 2018 July 2018 Jan 2019 Jul 2019
Wa
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King Tides
Review
Sept. 26-Oct. 3
Oct. 17 2019
Public Works Department
City Manager’s Office-Resilience
Summary
1. The City of Miami Beach
experienced King Tides from Sept.
26 to Oct. 3.
2. The stormwater system functioned
as expected during this event, but
higher than normal high tides caused
minor flooding or standing water in
some areas.
3. The areas that were affected
the most by this event are:
Indian Creek, North Bay Road,
North Beach and Commerce
Street. 2
Observed Water Levels -NOAA
Oct 1. -levels reached
2. 18 feet (NAVD)
•All days reached
NOAA’s threshold of
minor flooding.
•Some days reached
moderate flooding.
3
Observed Water Levels –Miami Beach Tidal Gauges
•Miami Beach tidal gauges indicate a
maximum tidal level of 2.25 feet NAVD
on Oct. 1.
•This graph shows that we avoided
eight tidal flooding events due to road
raising in Sunset Harbour during Sept.
26-Oct. 3.
•2017: 17 events avoided
•2018: 11 events avoided
•2019: 32 events avoided
4
Flood Extent
& Impact
1. Tides were about 1 foot
higher than predicted,
reaching 2.18 feet on Oct. 1
and reaching 1.5 feet or
higher the rest of days
(Sept. 26-Oct. 3).
2. Approximately 200
standing water/minor
flooding events captured
by staff through Crisis
Track on Sept. 30.
3. 18 flood/drainage
requests captured
through control room
and CityWorks.
5
18 Flood/standing water
related complaints from
Cityworks (includes EGov
and phone calls to the
Public Works Control
Room)
6
Crisis Track Standing
Water/Flood Events
Reported (Sept. 30)
•71 Standing water
•80 Significant standing water
•45 Stormwater flooding
7
4580 N. Bay Road, Miami Beach FL 33140, Sept. 27 at 9:27am
8
Indian Creek, Sept. 28
9
Collins Ave, Indian Creek and Jefferson Ave., Sept. 28 and
30, morning
Flooding in Sardinia during
peak hour.
10
Royal Palm Ave, Alton Rd. and N Bay Rd, Sept. 30, morning
and noon
Flooding in Sardinia during
peak hour.
11
3250 Chase Ave., Sept. 30
12
Indian Creek., Oct. 1
13
Rue Notre Dame, 45th Street and N. Bay Rd, Oct. 1-2,
afternoon
14
Mid-Beach and North Beach Oct. 1-2, early afternoon
15
34th Street and Garden Ave, Oct. 2
16
Sunset Harbour, Oct. 2
17
Sunset Harbour, Oct. 2
18
Sunset Islands, Oct. 15
19
Impact From
King Tides
Event
Traffic congestion in the following areas:
1. Indian Creek Drive
2. Collins Avenue
No business closures or road closures.
No damage to fleet.
Private properties and roads experienced standing
water, significant standing water and stormwater
flooding.
20
Standing Water/Flooding in Completed or Active Projects
Sardinia at 1:17 pm –
water cleared on the outside
area.
1.Sunset Harbour
2.Sunset 3 and 4
3.Venetian Islands
4.Palm and Hibiscus
5.Indian Creek, 25TH –32ND St
6.Lower North Bay Rd.
Did these neighborhoods
experience standing water/
flooding?
21
Action: Will monitor according
to SOP , going forward
Standing Water/Flooding in Neighborhoods Requiring Monitoring
Sardinia at 1:17 pm –
water cleared on the outside
area.
Did these neighborhoods
experience standing water/
flooding? Discussion
Action: Will monitor according
to SOP , going forward
22
1.North Beach
2.Central Lower North Bay Rd
3.Central Bayshore
4.Central Bayshore South
5.Lakeview
6.Orchard Park
7.Palmview
Response to
King Tides Event
From Staff
Public Works:
1. Used temporary
pumps to alleviate
flooding
2. Checked pumps
3. Responded to
complaints
4. Communicated
with businesses
and residents
5. Documented
flooding/standing
water
CIP:
1. Documented
construction
projects
2. Checked
construction sites
3. Checked that
pumps were
operational
Emergency
Management:
1. Communicated
tidal levels
internally
2. Checked weather
updates to monitor
NWS advisories
3. Worked with
Public Works to
create Crisis Track
event
Communications:
1. Sent social media
and email updates
about event
2. Advised the
public to report
flooding/standing
water to control
room
3. Documented
standing
water/flooding
23
Develop an approach to
documenting conditions
and how improvements
are working.
Flood Documentation
Procedure (DRAFT)
discussion
24
Residents/ Employees
Employees
Neighborhood Infrastructure Projects
Future Neighborhoods (low-lying)
Social Media
Private Property Damage
Estimated
Resources &
Costs
25
Public Works Operations (Yard):
•Total of 15 people worked during event
•Equipment used: vactor trucks,
temporary bypass pumps, pick-up
trucks, fuel trucks
•Estimated value of temporary bypass
pumps: $36,560
•Estimated value of fuel for temporary
bypass pumps: $3,656
•Estimated value of labor & equipment
such as vehicles and vactor trucks:
$15,000
Recommendations
26
Create a GIS map of planned, completed and in-progress
stormwater projects. (pending)
Discuss changes to City Code that may require higher elevation
and/or an commercial property owner (Nov SRC).
Utilize employees already in the community (PWD, Code, Police)
to take photos. (in draft SOP)
Coordinated approach in using systems to avoid repetition of
data and efforts.(in draft SOP)
Develop plan for tracking and monitoring after-action
recommendation. (complete)
Update the Flood Response Preparedness & Communication
Standard Operating Procedure (in draft SOP)
Conduct routine after-action meetings to understand what went
well and what needs improvement. (underway)
Train staff on using control room as a central point for
communicating and addressing flood complaints. (complete)
Event Review
What went well during
event? discussion
What are potential
opportunities for
improvement? discussion
27
Sources
28
•Crisis Track photos, drone imagery and
flood events data.
•CityWorks requests and work orders
related to standing water/flooding.
•Photos from Public Works Operations and
Communications.
•Narratives and input from Public Works,
Communications, CIP and Emergency
Management.
•Data can be found in the M drive:
M:\$CMB\Resiliency_Strategy_Team
under “Miami Beach 2019 Rain and King
Tides.”
Thank you
29