Public Review of Draft Boulder County Floodplain Maps Januar y 31, - - PowerPoint PPT Presentation

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Public Review of Draft Boulder County Floodplain Maps Januar y 31, - - PowerPoint PPT Presentation

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Public Review of Draft Boulder County Floodplain Maps Januar y 31, 2017 Boulde r , CO HOUSEKEEPING Sign- in she e t Ne wsle tte r s & F lye r s L oc ator Map (add your dot!) Snac ks, r e str ooms, e tc .

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SLIDE 1

Public Review of Draft Boulder County Floodplain Maps

Januar y 31, 2017 Boulde r , CO

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SLIDE 2

HOUSEKEEPING

  • Sign- in she e t
  • Ne wsle tte r

s & F lye r s

  • L
  • c ator

Map (add your dot!)

  • Snac ks,

r e str

  • oms, e tc .
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SLIDE 3

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!

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SLIDE 4

Introductions

  • E

rin Coope r, Boulde r County

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

lliott, CWCB

  • Ge off Uhle ma nn, AE

COM (CWCB)

  • Ga rry Sa nfa ç on, Boulde r County
  • Ke vin Doyle , Mic ha e l Ba ke r Intl.
  • Additiona l Boulde r County Support Sta ff
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SLIDE 5

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

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SLIDE 6

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?

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SLIDE 7
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SLIDE 8

www.c olor adohazar dmapping.c om

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SLIDE 9

www.c olor adohazar dmapping.c om

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SLIDE 10

www.c olor adohazar dmapping.c om

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SLIDE 11

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

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SLIDE 12
  • 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

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SLIDE 13

Flows Experienced & Modeled

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

Boulde r Cr e e k (@ Hwy 287)

  • Ne wly Mode le d – 13,500 c fs (6% inc r

e ase )

  • E

ffe c tive F E MA – 12,700 c fs

Boulde r Cr e e k (b e lo w F

  • urmile Cr)
  • Ne wly Mode le d – 6,850 c fs (41% de c r

e ase )

  • E

ffe c tive F E MA – 11,650 c fs

South Boulde r Cr e e k (a b o ve

E ldo ra do Spring s)

  • Ne wly Mode le d – 5,330 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

Boulde r Cr e e k (@ Hwy 287)

9,000 c fs (~50 yr e ve nt)

Boulde r Cr e e k (b e lo w F

  • urmile Cr)

4,818 c fs (~50 yr e ve nt)

South Boulde r Cr e e k (a b o ve

E ldo ra do Spring s)

2,120 c fs (<25 yr e ve nt)

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SLIDE 14

Flows Experienced & Modeled

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

T wo Mile Canyon Cr e e k (@ L

inde n a nd 4th St)

  • Ne wly Mode le d – 699 c fs (0% inc r

e ase )

  • E

ffe c tive F E MA – 699 c fs

Coal Cr e e k (@ Hwy 93)

  • Ne wly Mode le d – 3,590 c fs (ne w study)
  • E

ffe c tive F E MA – NA

Roc k Cr e e k(@ Hwy 128)

  • Ne wly Mode le d – 1,190 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

Coal Cr e e k (ne a r Pla invie w Rd)

3,900 c fs (> 100 yr e ve nt)

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SLIDE 15

2013 Flood vs. 100-yr Mapped Floodplain

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SLIDE 16

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

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SLIDE 17

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

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SLIDE 18

c

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SLIDE 19

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)

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SLIDE 20

Hatc he d laye r s ar e same laye r type s as

  • nline ; pr

inte d in c olor for e ase of vie wing

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SLIDE 21

Solid c olor ar e as =

c urre nt re g ula to ry flo o dpla ins

L e tte r s = Ma p Zo ne s

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SLIDE 22

County Floodplain Remapping

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

[

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SLIDE 23

Using the Map Review Website

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

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SLIDE 24

Map Review Website

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SLIDE 25

Map Review Website

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SLIDE 26

Map Review Website

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SLIDE 27

Map Review Website

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SLIDE 28

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

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SLIDE 29

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

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SLIDE 30

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

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SLIDE 31

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
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SLIDE 32

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 o ntac t info on maps
  • Use c omme nt for

ms

  • If you think the map ne e ds r

e vision, te ll us WHY

  • DE

ADL INE for c omme nts for this ar e a: F E BRUARY 28th

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