HURRICANE IRMA FLOOD DATA AND WATERSHED MODELING FSA Annual - - PowerPoint PPT Presentation

▶
hurricane irma
SMART_READER_LITE
LIVE PREVIEW

HURRICANE IRMA FLOOD DATA AND WATERSHED MODELING FSA Annual - - PowerPoint PPT Presentation

Jun 06, 2023 486 likes •781 views

HURRICANE IRMA FLOOD DATA AND WATERSHED MODELING FSA Annual Conference: June 13-15, 2018 Mark Fulkerson , PhD, PE (SWFWMD) Kent Boulicault , PE (SAI) O UTLINE Hurricane Irma response Management of flood data Mill Creek watershed

slide-1
SLIDE 1

HURRICANE IRMA

FLOOD DATA AND WATERSHED MODELING

FSA Annual Conference: June 13-15, 2018 Mark Fulkerson, PhD, PE (SWFWMD) Kent Boulicault, PE (SAI)

slide-2
SLIDE 2

Ifrc.org

OUTLINE

  • Hurricane Irma response
  • Management of flood data
  • Mill Creek watershed model

2

slide-3
SLIDE 3
  • Lifetime max winds 185 mph

(strongest in Atlantic outside Caribbean)

  • Max winds for 37 hours
  • 3.25 days as a Cat 5 hurricane

(tied for longest in Atlantic)

  • 8.5 days as a major hurricane

(2nd since 1966 )

  • Landfall Cudjoe Key, FL: 130 mph

(strongest continental Landfall)

  • 1st Cat 4 in FL since Charley (2004)
  • 1st Major Hurricane since Wilma (2005)
  • 2nd Landfall Marco Island, FL: 115 mph

HURRICANE IRMA

3

slide-4
SLIDE 4
  • EOC activation
  • Tested/fueled generators
  • Deployed sandbags
  • Operated structures
  • Relaxed regulations

4-5 day potential track area

STORM PREPARATION

4

slide-5
SLIDE 5

IRMA IMPACTS

FLOODING POWER OUTAGES STRUCTURE FAILURES FISH KILLS FLOW RESTRICTIONS

5

slide-6
SLIDE 6
  • Cleared debris
  • Repaired structures
  • Responded to flood complaints
  • Assisted other agencies/public
  • Documented high water

STORM RESPONSE

6

slide-7
SLIDE 7
  • 400 flood photos
  • 270 flood complaints
  • 200 high water elevations

7

Approximate Path of Irma

HIGH WATER DOCUMENTATION

slide-8
SLIDE 8

FLOOD COMPLAINTS KNOWN FLOODING AREAS FLOOD PHOTOS HISTORICAL WATER LEVELS

ftp://ftp.swfwmd.state.fl.us/pub/gisdata/HighWater_Database/

HIGH WATER DATABASE

8

(location and elevation)

slide-9
SLIDE 9
  • Historical Evidence
  • Public Awareness

IMPORTANCE

9

slide-10
SLIDE 10
  • Historical Evidence
  • Public Awareness
  • Limited Data

IMPORTANCE

10 Surface Water Gage

slide-11
SLIDE 11

Built Flooded Mitigated 2002 2004 2006

  • Historical Evidence
  • Public Awareness
  • Limited Data
  • Decision Making

IMPORTANCE

11

slide-12
SLIDE 12
  • Historical Evidence
  • Public Awareness
  • Limited Data
  • Decision Making
  • Verification Tool

No Historical FEMA Floodplain Modeled 100-yr Floodplain (SWFWMD, 2010)

IMPORTANCE

12

2003 FLOOD PHOTO

slide-13
SLIDE 13

WATERSHED MANAGEMENT PROGRAM

  • Cooperative funding
  • Identify flood risk
  • Storm water

implementation projects

(122) (35)

13

slide-14
SLIDE 14

Mill Creek Watershed

14

MILL CREEK

LAKE MANATEE GAMBLE CREEK BUFFALO CANAL/ FROG CREEK BRADEN RIVER SR-64 MANATEE RIVER

slide-15
SLIDE 15

Mill Creek Watershed

15

SR-64

MANATEE RIVER

LAKEWOOD RANCH BLVD

MILL CREEK

slide-16
SLIDE 16

16

Model Network Development (1D / 2D)

Legend

Mill Creek Watershed

! (

Nodes

Links

Channels Drop Structures Pipes Rating Curves Weirs Subbasins 2D Areas

slide-17
SLIDE 17

17

2D Feature Development

slide-18
SLIDE 18

Field Data Acquisition

Collaborative Effort

SAI & SWFWMD

18

SAI

SWFWMD

slide-19
SLIDE 19

Field Data Acquisition

  • SWFWMD

– Stream cross-sections – Bridges – Structures distant from hard surfaces

19

slide-20
SLIDE 20

Field Data Acquisition

  • SWFWMD

– High water marks – Coordinated with residents

20

slide-21
SLIDE 21

Flooding and High Water Documentation

21

Inactive: 2013 Inactive: 2016

Legend ! .

Gages

# *

Flooding Photo Locations

# *

Known Flooding Locations

# *

Historic Water Levels

# *

Flooding Complaint Locations Mill Creek Watershed

Installed: 2016 Hurricane Irma High Water Mark

Hurricane Irma: 6.3” in Mill Creek

slide-22
SLIDE 22

Comparison of Observed Stage and Preliminary Simulated Stage During the IRMA Storm at Gage (E. Mill Run)

22

Simulated: 17.7 FT-NAVD Observed: 20.0 FT-NAVD

slide-23
SLIDE 23

Comparison of High Water Mark and simulated stage of White Eagle Boulevard @ Mill Creek

23

Observed: 19.8 FT-NAVD Simulated: 21.2 FT-NAVD

slide-24
SLIDE 24

Comparison of High Water Mark and simulated stage of Rye Road @ 18th Place East

24

Observed: 17.2 FT-NAVD Simulated: 21.2 FT-NAVD

slide-25
SLIDE 25

Preliminary Flood Plain for Hurricane IRMA

(State Rd. 64 @ Rye Rd.)

25

slide-26
SLIDE 26
  • Evaluate ICPR V4 Runoff methodologies (Curve Number, Green-Ampt,

Vertical layers

  • Calibration / sensitivity analyses

– Hydraulic

  • Initial conditions (wetland/lake stages, etc.)
  • Flow obstructions (sediment accumulation)
  • Manning’s values in 1D and 2D areas

– Hydrologic - Runoff evaluation

  • Soil parameters (permeability / thatch effects, soil storage)
  • Antecedent conditions
  • Peak Rate Factor
  • Calibrate 1D ag areas using 2D approach (consider pumping operations)
  • Validate the calibrated model using August 2017 storm or TS Hermine

26

Calibration – Next Steps

slide-27
SLIDE 27

27

slide-28
SLIDE 28

MICHAEL SECHLER

QUESTIONS?

Hurricane Irma, 2017