Public Review of Draft Boulder County Floodplain Maps Januar y 19, - - PowerPoint PPT Presentation

Public Review of Draft Boulder County Floodplain Maps

Januar y 19, 2017 Alle nspar k, CO

HOUSEKEEPING

• Sign- in she e t
• Ne wsle tte r

s & F lye r s

• L
• c ator

Map (add your dot!)

Tonight’s Agenda

• 1. Intr
• duc tions
• 2. Me e ting Goals
• 3. Pr
• gr

am Ove r vie w

• 4. Boulde r

County’s Role

• 5. Data Ove r

vie w

• 6. Online Re sour

c e s

• 7. T
• the T

able s!

Introductions

• E

rin Coope r, Boulde r County

• Va rda Blum, Boulde r County
• Core y E

lliott, CWCB

• Rig e l Ruc ke r, AE

COM (CWCB)

• Ke vin Doyle , Mic ha e l Ba ke r Intl.
• Da vid Sutle y, F

E MA

• Ma tt Buddie , F

E MA

• Ga rry Sa nfa ç on, Boulde r County

Meeting goals:

• 1. Inform re side nts & la ndowne rs (you!)
• f the re ma pping proc e ss
• 2. Provide opportunity for public

c omme nt be fore the F E MA a ppe a l pe riod

Colorado Hazard Mapping Program

Why is this study be ing c onduc te d?

• Ha za rds c ha ng e
• F

loodpla in de line a tions a re ofte n outda te d a nd inc orre c t

• Ma ps re g ula rly upda te d a c ross the c ountry by F

E MA, Sta te s, Communitie s

• T

he Sta te of CO initia te d CHAMP a fte r the F lood of 2013

• Cha ng e s to flooding c ha ra c te ristic s
• Cha ng e s to unde rsta nding of ra infa ll

Why doe s it impac t you?

• Know if you a re a t risk for flood ha za rds
• Will re vise F

lood Insura nc e Ra te Ma ps tha t impa c t insura nc e ra te s (ba se d

• n risk)
• Re g ula tion is re la te d to flood zone / floodwa y

Whe r e will the r e be c hange s?

www.c olor adohazar dmapping.c om

www.c olor adohazar dmapping.c om

www.c olor adohazar dmapping.c om

Colorado Hazard Mapping Program

What happe ns ne xt?

• T

he re a re still multiple re vie ws tha t will oc c ur, so da ta is subje c t to c ha ng e

• Boulde r County be ing proa c tive to bring this informa tion to you in dra ft

form

• T

his is a first look for you to g e t your input we ll in a dva nc e of da ta fina liza tion

Whe n will c hange s go into e ffe c t?

• CHAMP te a m will re vie w c omme nts
• F

E MA will re vie w da ta in spring 2017

• Da ta will be put onto pre limina ry F

lood insura nc e Ra te Ma ps in fa ll 2017

• A forma l 90 da y a ppe a l pe riod will c omme nc e whe re a nyone c a n

a ppe a l ma ps with te c hnic a l da ta

• Onc e re solve d, ma ps will be re le a se d a s fina l (e ffe c tive ), like ly la te

2018/ e a rly 2019

• E

nc our age c ommunity input to impr

• ve map

ac c ur ac y

• E

ar ly adoption to pr

• mote he alth & safe ty
• f r

e side nts

Boulder County’s role

De stro ye d struc ture a lo ng the Middle St. Vra in

Flows Experienced & Modeled

Mode le d Disc har ge s of the 100- yr F lood E ve nt

South St. Vr ain (upstre a m o f L

yo ns)

• Ne wly Mode le d – 7,230 c fs (33% inc r

e ase )

• E

ffe c tive F E MA – 5,430 c fs

Middle St. Vr ain (@ Rive rside )

• Ne wly Mode le d – 2,160 c fs (8% c hange )
• E

ffe c tive F E MA – 2,000 c fs

Nor th St Vr ain (a b o ve Butto n Ro c k)

• Ne wly Mode le d – 6,956 c fs (ne w study)
• E

ffe c tive F E MA – NA

Cabin Cr e e k(@ mo uth)

• Ne wly Mode le d – 2,594 c fs (ne w study)
• E

ffe c tive F E MA – NA

E stimate d Pe ak Disc har ge s E xpe r ie nc e d in 2013 F lood

South St. Vr ain (upstre a m o f L

yo ns)

9,000 c fs (100 – 500 yr e ve nt)

Middle St. Vr ain (@ Rive rside )

1,750 c fs (50 – 100 yr e ve nt)

Nor th St. Vr ain (@ Hwy 7)

450 c fs (10 yr e ve nt)

2013 Flood vs. 100-yr Mapped Floodplain

Roles and Responsibilities

F e de r al Role (F E MA)

• F

lood Risk Mapping

• F

lood Risk Manage me nt

• F

lood Insur anc e – available to anyone

State Role (CWCB)

• Community assistanc e
• F

lood Risk Mapping

L

• c al Role (Boulde r

County)

• Adoption of floodplain mapping and c ode
• F

lood r isk mapping par tic ipation

Ultimate Go al – Pr

• te c t L

ife , He alth, & Safe ty

Timeline revisited

Now Boulde r County is r e vie wing the hydr aulic s and floodplain mapping Spr ing 2017 F E MA will r e vie w the hydr aulic s and floodplain mapping, Boulde r County to adopt floodplain as “be st available data” L ate 2017 Pr e liminar y F lood Insur anc e Rate Maps issue d E ar ly 2019 F lood Insur anc e Rate Maps E ffe c tive *a ll da te s sub je c t to c ha ng e

County Floodplain Remapping

http:/ / boc ofloodpla inre ma pping .c om

[

County Floodplain Remapping

http:/ / boc ofloodpla inre ma pping .c om

[

Using the Map Review Website

Dire c t link: http:/ / a rc g .is/ 2fF 4CZY

Map Review Website

Map Review Website

Map Review Website



Map Review Website

c

c

500- ye ar floodplain 100- ye ar floodplain floodway

Some maps on your table s have dr aft laye r s in c olor s (not gr ay)

How to comment

• Ho w to c o mme nt
• T

e xt b o x with a lte rna tive me tho d

• 6. Map Review

Website

How to comment

• Ho w to c o mme nt
• T

e xt b o x with a lte rna tive me tho d

• 6. Map Review

Website

Instructions button

• Ho w to c o mme nt
• T

e xt b o x with a lte rna tive me tho d

• 6. Map Review

Website

Resources button

• Ho w to c o mme nt
• T

e xt b o x with a lte rna tive me tho d

• 6. Map Review

Website

Uppe r r ight hand c or ne r

• f we bpage

Draft Maps at the Tables

• Wha t we ’d like to le a rn from your re vie w:
• Str

uc tur e loc ations – ac c ur ate ?

• Planne d wor

k?

• T
• pogr

aphic de tails

• Impac ts to wate r

flow

• Comme nts!
• Ple ase inc lude name & c ontac t info on maps
• Use c omme nt for

ms

• DE

ADL INE for c omme nts for this ar e a: JANUARY 31st

Re ma pping Point of Conta c t: E rin Coope r floodpla inma psc omme nt@boulde rc ounty.org