6:40 8:00 : Open House 1 Update of King County Communities FEMA - - PowerPoint PPT Presentation

1

▸6:00 : Doors Open ▸6:10 : Presentation ▸6:40–8:00 : Open House

2

Update of King County Communities’ FEMA Flood Insurance Rate Map

Open House

March 21, 2018

3

Agenda

• Background of the National Flood Insurance Program
• Flood Study Map Update
• Process and Schedule
• Open House Layout

4

King County Communities

Background of the National Flood Insurance Program

5

Purpose of the National Flood Insurance Program (NFIP)

The NFIP is a Federal program enabling property owners in

participating communities to purchase insurance as a protection against flood losses in exchange for State and community floodplain management regulations that reduce future flood damages.

...If a community adopts and enforces a floodplain

management ordinance to reduce future flood risk to new construction in floodplains, the Federal Government will make flood

insurance available within the community as a financial protection against flood losses. Program started in 1968.

6

Purpose of the National Flood Insurance Program (NFIP)

7

Basis for Floodplain Mapping

1% Annual Chance Flood (“100-year”) Standard

1,125,000 Miles of River are mapped for the NFIP – on average 11,250 miles of river are seeing the 1% flood or greater every year. 42,500 Miles of Coastline are mapped – on average 425 miles of coastline are seeing the 1% flood or greater every year.

8

Purpose of the National Flood Insurance Program

Reduce duce economic

• nomic loss

ss cause sed d by flood

• od events

ents

• Between 1980 and 2013, the

United States suffered more than $260 billion in flood- related damages.

• Flooding accounts for

approximately 85% of all disaster declarations.

• On average, more people die

annually from flooding than any other natural hazard. Graphs from http://www.nws.noaa.gov/hic/ With adjustment for katrina

9

Purpose of the National Flood Insurance Program

Reduce uce economic

• mic loss

ss caused d by flood d events ts

10

King County Flood Insurance Claims 1977-Present

Community Claims Paid Building Contents Total Auburn 6 44,223.24 $

• $

44,223.24 $ Bellevue 35 642,502.31 $ 119,102.93 $ 761,605.24 $ Burien 10 75,323.02 $ 8,730.57 $ 84,053.59 $ Carnation 21 634,440.21 $ 122,206.47 $ 786,646.68 $ Des Moines 5 216,514.76 $ 4,237.18 $ 220,751.94 $ Duvall 4 136,708.84 $ 9,802.75 $ 146,511.59 $ Enumclaw 3 56,801.50 $ 12,699.15 $ 69,500.65 $ Federal Way 3 17,532.90 $ 2,132.60 $ 19,665.50 $ Issaquah 125 3,089,181.06 $ 892,651.36 $ 3,981,832.42 $ Kenmore 1 14,697.30 $

• $

14,697.30 $ Kent 15 148,628.44 $ 1,205.06 $ 149,833.50 $ Unincorporated King County 1000 18,654,592.46 $ 3,045,796.34 $ 21,818,494.17 $ Kirkland 4 40,083.87 $ 4,434.97 $ 44,518.84 $ Lake Forest Park 1 1,886.44 $

• $

1,886.44 $ Mercer Island 2 20,830.35 $

• $

20,830.35 $ Milton 4 70,379.73 $

• $

70,379.73 $ Normandy Park 3 13,978.43 $

• $

13,978.43 $ North Bend 61 826,087.52 $ 159,679.81 $ 985,767.33 $ Pacific 35 579,145.56 $ 19,864.30 $ 599,009.86 $ Redmond 5 22,290.75 $

• $

22,290.75 $ Renton 10 71,134.89 $ 13,840.03 $ 84,974.92 $ Sammamish 2 41,996.22 $

• $

41,996.22 $ SeaTac 1 1,319.24 $

• $

1,319.24 $ Seattle 122 1,692,480.66 $ 358,460.87 $ 2,050,941.53 $ Shoreline 1 4,021.74 $

• $

4,021.74 $ Skykomish 23 362,992.17 $ 11,247.47 $ 374,239.64 $ Snoqualmie 872 15,570,635.09 $ 2,300,850.94 $ 18,114,839.26 $ Tukwila 1 1,309.89 $

• $

1,309.89 $ Total 2375 43,051,718.59 $ 7,086,942.80 $ 50,530,119.99 $

11

Flood Definition

From FloodSmart.com: A flood is a general and temporary condition where two or more acres of normally dry land or two or more properties are inundated by water or mudflow.

12

Mandatory Purchase Requirement

Two federal statutes mandate purchase of flood insurance

• The Flood Disaster Protection Act of 1973
• The National Flood Insurance Reform Act of 1994

▸Applies to properties in the 1% Chance Floodplain

• Insurance is a prerequisite to receive a loan from Federally regulated and insured

lenders.

• The requirement is triggered when a loan is:
• Made
• Increased
• Renewed
• Extended
• The insurance must be in effect for the life of the loan.
• Monetary penalties on lenders for non-compliance, requires escrow accounts for
• ther insurance purposes, and requires that lenders review flood maps and map

changes.

13

How the National Flood Insurance Program (NFIP) Works

Three disciplines of the NFIP:

• Mapp

pping ng – Fl Floo

• od

d Studi dies

• Regulations

lations

• Ins

nsuran rance ce

14

King County Communities

Review of the Flood Study Map Update

15

▸ New maps are digital county-wide ▸ Follows a USGS Quad layout – countywide coverage with no city “cut-outs” ▸ Re-delineation of flooding sources where better topography was available ▸ Vertical Datum change (NGVD 1929 to NAVD 1988)

Map Modernization Process

16

What’s new

Vertical tical Da Datum tum Chang ange

▸ NGVD 29

• Based on a mean sea level from 21 tidal stations in the US & 5

stations in Canada ▸ NAVD 88

• Based on the density of the Earth instead of varying values of sea

heights

• More accurate

▸ Conver

versio sion n for King Count nty y Varies ies

• NGVD + (vertical adjustment’) = NAVD
• Conversion factor for County for FIS ranges from 3.5 to 4.1 feet

17

Digital Flood Insurance Rate Maps

Vertical Datum and FIRMs (e.g. uses 3.8’ conversion)

NGVD D 29 NA NAVD VD 88 BFE E = 5 5.8 ft BFE E = 2 2 ft ft

15 15 5 10 10 15 15 10 10 5

18

King County DFIRM Timeline

• Scoping Meeting – July 27, 2005

Discuss proposed scope of work, identify available data and update needs, 25 Attendees

• Levee Certification Documentation Needs Identified – April 2006
• Preliminary Map Release – September 2007
• King County Appeal – February 2008
• Revised Preliminary Map Release – November 8, 2010
• FEMA Letter to Senators on Levee Policy– March 2011

Hi History

19

King County DFIRM Study Timeline

Hi History y

20

Seclusion (2017) Seclusion and appealable areas 38 map panels

21

Riverine Floodplain and Floodway Definitions

100 YEAR FLOODPLAIN

SURCHARGE

FLOODWAY

FLOODWAY FRINGE

FLOODWAY + FLOODWAY FRINGE = 100 YEAR FLOODPLAIN SURCHARGE NOT TO EXCEED 1.0 FEET

22

Survey Collection

• Collected by Minister Glaeser

Surveying in 2006

• 42 bridges
• 282 cross sections
• 40.5 miles of stream

LiDAR Survey

23

Hydrologic Methods

EXCEEDANCE FREQUENCY IN PERCENT

2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 10,000 100,000 1,000,000

DISCHARGE (cfs)

• ST. DEV.=

SKAGIT RIVER NEAR CONCRETE USGS #12194000 UNREGULATED PEAK FLOWS DERIVED FROM PEAK VERSUS 1DAY REGRESSION CORPS OF ENGINEERS, SEATTLE DISTRICT 28 APR 1998 BASIN AREA= 2737 SQ MI WATER YEARS OF RECORD HISTORIC EVENTS= 1898, 1909, 1917, 1921 RECORDED EVENTS= 1925, 1944-1991, 1994-1996

CONSTRUCTED BY:

• C. FITZGERALD, E.I.T.

APPROVED BY: ____________________________________ HEC-FFA COMPUTED CURVE EXPECTED PROBABILITY ADJUSTMENT 5% CONFIDENCE LIMITS 95% CONFIDENCE LIMITS MEDIAN PLOTTING POSITIONS

F l

• w

Frequency

24

Hydraulic Methods

Method Description Detailed (Zone AE)

• Steady State HEC-RAS model
• Roughness is examined closely (calibrated to gages)
• High water mark data were collected by nhc and MGS for

the high flow events of January 7, 2006, November 11, 2006, and March 25, 2007

• Floodway Analysis

25

Green River Scope of Work (2010)

26

Why Modify our Current Approach?

▸ Throughout Map Modernization,

stakeholders expressed concern on the “without-levee” procedures used to map non-accredited levees

▸ In February 2011, a group of U.S.

Representatives and Senators wrote to FEMA requesting a revision to the current practice of mapping levees and their associated flood risk.

▸ Stakeholders and Congress felt the

historical mapping approach did not reflect the hazard reduction that some non-accredited levees may still afford.

27

Levee Policy Process

▸ Th

The e King County ty Fl Flood d Insur surance ance Stu tudy y has s bee een on ho hold as i s it t waits ts for r FEMA A to to f finalize alize a ne new appro roach ach in sh showin ing g floodp

• odplains

lains on th the landwa ward rd si side of leve vees es th that t are re not t accre redit ited ed to to pr prote tect t against nst th the e 1% f flood.

• od.

28

Seclusion criteria

▸ The

e le leve vee e has s not t be been n sh show

• wn

n to to meet et 44 CFR R 65.10

▸ The

e leve vee e is h s hydrau draulicall ically y si signifi nificant cant du duri ring g th the e 1% fl flood,

• d,

▸ The

e leve vee e has s an owner, er,

▸ The

e leve vee e meets ets th the e de definition nition of a leve vee e as s sp spelled led out t in 44 CFR R 59, and/ d/or,

• r,

▸ The

e flo lood

• d hazards

ards at t th the e le levee ee we were re upd pdate ted d wi with th a new w analy alysis sis in in th the e Kin ing g County unty flood

• d st

study dy effort forts. s.

29

Seclusion Mapping Process

Current Effective FIRM Depicted

Seclusion Boundary

St Study dy Findi inding ngs Depicted ed

30

Preliminary Map Format

31

King County Communities

The Flood Mapping Process and Schedule

32

RiskMAP, the NFIP and Hazard Mitigation Planning

33

WA State Risk MAP Website

https://waecy.maps.arcgis.com/apps/MapSeries/index.html?appid=8451cb0db0c4461182e592eb5a43400a

34

Timeline

Leve vee e Seclus usion n Meet eting ng fo for Commu muni nity ty St Staff

June 14, , 2016

CCO Meet eting ng

Nov

• vembe

ber 20, , 2017

Preliminar minary y Maps s issued ed

Septembe ber 15, , 2017

Public c Open en Hous

• use

e Meetin eting

March h 21, , 2018

Appeal eal Period

~Apri ril 17, , 2018

Effe fecti tive e Date

~Summ mmer r 2019 19

“Letter of Final Determination”

To communities and publishes the BFEs in the Federal Register Communities have 6 months to adopt the study before the data becomes “effective”. Failure to adopt results in suspension from NFIP

End of Appeal eal Period

~July y 15, , 2018

FEMA issues es LFD

~Winter r 2018/1 /19

35

Input & Comments

▸ Private

vate lando ndowne wners rs submit bmit to their eir commu munity ity officials icials

▸ Commun

munity ity bundles dles all the comment ments s and nd forwards rds them m to FEM EMA A Regi gion

• n 10 Servi

vice ce Cent nter

▸ Forms

ms will ll be available ilable at the e Op Open en House se

36

Letters of Map Change (LOMC)

Lette ter r Of Of Map p Amendment endment (LOM OMA) A) – for property owners who

believe a property was incorrectly included in a floodplain, primarily through showing that the lowest elevation of the structure is above the 1% flood elevation.

(LOM OMA) A) Hotline line – 1-877 877-FE FEMA-MAP MAP Lette ter r Of Of Map p Revision vision (LOM OMR) R) – for communities to submit

better technical information to change a floodplain or to reflect physical changes made to the floodplain.

LOMR

37

King County Communities

Open House Layout

38

Information Tables

Proper perty y ID D & Di Digital ital Mappi pping ng

Receive a printed map

• f your property and

understand the flood zone

Flood

• d St

Study dy / Eng nginee ineerin ring

Understand the methodology and technical specifications of the maps

Flood

• d Ins

nsuran urance ce

Learn about your insurance policy options and rates

St State e Table ble

Gain insights into state floodplain mapping priorities

Commu munity ity Table ble

Ask about city/county floodplain regulations and hazard plans

Flood

• dplain

lain Regul gulations tions

Gather information on specific building requirements / restrictions