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 oc ator Map • (add your dot!)

Tonight’s Agenda 1. Intr oduc tions 2. Me e ting Goals 3. Pr ogr 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 o 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!) of 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 • on 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?

dmapping.c om www.c olor adohazar

dmapping.c om www.c olor adohazar

dmapping.c om www.c olor adohazar

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

Boulder County’s role E nc our age c ommunity • input to impr ove map ac c ur ac y E ar ly adoption to • pr omote he alth & safe ty of r e side nts 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 • Ne wly Mode le d – 7,230 c fs (33% inc r e ase ) South St. Vr ain (upstre a m o f L yo ns) • E ffe c tive F E MA – 5,430 c fs • Ne wly Mode le d – 2,160 c fs (8% c hange ) Middle St. Vr ain (@ Rive rside ) • E ffe c tive F E MA – 2,000 c fs • Ne wly Mode le d – 6,956 c fs (ne w study) Nor th St Vr ain (a b o ve Butto n Ro c k) • E ffe c tive F E MA – NA • Ne wly Mode le d – 2,594 c fs (ne w study) Cabin Cr e e k (@ mo uth) • 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 9,000 c fs (100 – 500 yr e ve nt) South St. Vr ain (upstre a m o f L yo ns) 1,750 c fs (50 – 100 yr e ve nt) Middle St. Vr ain (@ Rive rside ) 450 c fs (10 yr e ve nt) Nor th St. Vr ain (@ Hwy 7)

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 oc al Role (Boulde r County) Adoption of floodplain mapping and c ode • F lood r isk mapping par tic ipation • Ultimate Go al – Pr o 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

500- ye ar floodplain floodway c 100- ye ar floodplain 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 Uppe r r ight hand c or ne r of we bpage Website

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 opogr 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 • e a: JANUARY 31 st DE ADL INE for c omme nts for this ar • Re ma pping Point of Conta c t: E rin Coope r floodpla inma psc omme nt@boulde rc ounty.org