2/5/2017 Hancock County Flood Risk Reduction Project Update: Maumee Watershed Conservancy District Draft Draft January 17, 2017 Project Overview Agenda Stantec Scope • Ga p Ana lysis Da ta Co lle c tio n • • De sig n Re fine me nt Why Alternatives? Alternatives • Hydra ulic • Cha nne l Wide ning , Da m Re mo va l, a nd Bridg e Mo dific a tio ns • Hydro lo g ic Dive rsio n E xpa nsio n / E xte nsio n a nd Sto ra g e Draft Draft • Our Cha lle ng e L a rg e r flo o ds ha ve o c c urre d mo re fre q ue ntly Draft Draft 1
2/5/2017 Draft Draft We ste rn Cha nne l Size Co sts E stima te Dive rsio n o f E a g le Cre e k 25-Year Channel Sizing Estimates 01 Lands & Damages $ 6,580,000 25-ye a r 3,000 c fs 02 Relocations $ 14,590,000 06 Fish & Wildlife $ 1,758,000 08 Roads, Railroads Bridges $ 2,657,000 50-ye a r 3,500 c fs 09 Channels and Canals $ 34,587,000 15 Floodway Control & Diversion Structure $ 8,708,000 18 Cultural Resource Preservation $ 692,000 30 Planning, Engineering & Design $ 8,182,000 100-ye a r 4,050 c fs 31 Construction Management $ 3,149,000 First Costs $ 80,903,000 Interest during construction $ 5,671,000 500-ye a r 5,400 c fs Total Cost $ 86,574,000 Draft Draft **Ab o ut $15 millio n a llo c a te d fo r b ridg e s a nd ro a ds Stantec Scope E nte r Sta nte c • Ana lyze the USACE F e a sib ility Re po rt to unde rsta nd the ir finding s a nd re c o mme nd a ny c ha ng e s to the Co rps c o nc lusio ns • Pe rfo rm fie ld surve ys a nd g e o te c hnic a l inve stig a tio ns • De te rmine pre fe rre d c ha nne l a lig nme nt • Prepare property acquisition plan and legal descriptions • Prepare final design and construction plans • Prepare necessary documents to secure Draft Draft regulatory permits 2
2/5/2017 Pha se 1 – Ga p Ana lysis Sta nte c Sc o pe Pha se 2 – Wo rk Pla n & Pro o f o f Co nc e pt Co nc e ptua l De sig n Adva nc e me nt • Pa rt A – Additio na l Da ta Co lle c tio n And Ana lysis • Pa rt B – Re fine me nt o f Co nc e ptua l De sig n • Pa rt C – 30% De sig n Pla ns Draft Draft 4 Key Gaps De sig n a nd E ng ine e ring Missing 1. Unc le a r pro je c t o bje c tive Da ta / Ana lysis Co st/ E c o no mic s 2. BCR le ss tha n 1.0 Hydro lo g y & Hydra ulic s (H&H) 3. Risk ba se d e va lua tio n ne e de d 4. Co nflic ting re sults be twe e n USACE mo de l a nd re po rt Draft Draft Pa rt B Pa th F o rwa rd • Asse ss wa ys to impro ve the initia l de sig n c o nc e pt (Alte rna tive 13) Re fine me nt o f Co nc e ptua l De sig n • Be ne fit/ Co st Ana lysis – E va lua te a dditio na l be ne fits to a c hie ve a BCR g re a te r tha n 1 • H&H – Asse ss va ria tio ns to the re c o mme nde d pla n via c ha nne l a lig nme nt, da m a lig nme nt, c ha nne l sizing Draft Draft 3
2/5/2017 Co nc e pt Diversion Channel Refinement De sig n Ana lysis Draft Draft Co nc e pt De sig n Ana lysis Dive rsio n Cha nne l Alig nme nt Draft Draft Co nc e pt De sig n Ana lysis E a g le Cre e k Dive rsio n Cha nne l Pro file Draft Draft 4
2/5/2017 Co nc e pt Preliminary Recommendations De sig n Re fine me nt • Re lo c a te e ntra nc e • Re duc e dive rsio n c ha nne l le ng th • At-g ra de inte rse c tio n with Aura nd Run E a g le Cre e k Dive rsio n • Re fine pro file Cha nne l – Re duc e o ve ra ll e xc a va tio n & wa ste Re duc e ro c k e xc a va tio n – • Upda te width fo r de sig n disc ha rg e 25yr -vs- 100yr c a pa c ity – • Cro ssing g e o me trie s • Gra ding Re vie w Draft Draft Why Problems to Solve Alternatives? • Co nflic ting Mo de l/ Re po rting Re sults Re sidua l Risk o f Pro je c t • • Do ub le -Pe a ke d Hydro g ra ph Draft Draft April 2015 August 2015 Draft Draft 5
2/5/2017 Draft Draft Upda te d Achieve approximately 4.5’ level of reduction in Pro je c t Findlay to reduce flooding Ob je c tive at Main Street and other key points Be tte r c ha nc e a t “flo o d fig hting ” “The 4.6’ drop in WSE in downtown Findlay is based on a model run Spe c ific & me asurable where the flow pro je c t g o al optimization feature did not properly converge on an internally consistent result.” Draft Draft T he Bla nc ha rd Rive r Wa te rshe d Draft Draft 6
2/5/2017 Hydro g ra ph 15,560 cfs 14,370 cfs Co mpa riso ns E xisting Co nditio ns 11,120 cfs 10,470 cfs Bla nc ha rd Rive r in F indla y 7,880 cfs 4,600 cfs 1,890 cfs Draft Draft Hr 43 Part A Hydro lo g y a nd Hydra ulic s (H&H) “There would be a minimal performance of Alternative 13 when storm Additio na l events are primarily over either the Blanchard River or Lye Creek watersheds upstream of Findlay, with minimal storm events over the Da ta Eagle Creek watershed.” Co lle c tio n USACE F e a sibility Study And Ana lysis Will E a g le Cre e k dive rsio n wo rk? • Pro b a b ility o f a disc ha rg e o f X o n E a g le Cre e k whe n the Bla nc ha rd Rive r in F indla y e xpe rie nc e s a disc ha rg e o f Y • Appro pria te ly size E a g le Cre e k dive rsio n fo r de sire d flo o d risk re duc tio n Draft Draft Pe rc e nt o f Wa te rshe d Influe nc e d Re sidua l Risk Draft Draft 7
2/5/2017 Hydro g ra ph Co mpa riso ns 11,120 cfs 10,890 cfs E a g le Cre e k 10,680 cfs Dive rsio n Bla nc ha rd Rive r in F indla y Draft Draft Hr 65 Bla nc ha rd Rive r Ra ting Curve a t Ma in Stre e t Draft Draft Alternative 13 (Recommended Plan) Why 25-year event diversion channel with Eagle Creek at 100 cfs • Alternatives? Curre nt pro je c t do e s no t fully a c hie ve de sire d re duc tio n (2’ dro p in WSE @ Ma in St.) • • Re c o mme nde d Pla n re c e ive s flo w fro m o nly 15% o f the dra ina g e a re a • BCE < 1.0 Pro je c t a dditio ns a nd/ o r e nha nc e me nts ne e de d to ma na g e “do ub le pe a k” • Draft Draft 8
2/5/2017 Alte rna tive s Draft Draft Hydraulic Improvements Co nc e pt De sig ns “Clean out the Blanchard!” Re vie we d Re mo ve Inline Riffle s/ Da ms Cha nne l Wide ning Bridg e Mo dific a tio ns Draft Draft F lo o dpla in Be nc h Wide ning Hydra ulic Impro ve me nts Draft Draft 9
2/5/2017 L o w He a d Da ms & Riffle Struc ture s Hydra ulic Impro ve me nts Draft Draft RR Bridg e F a c ing upstre a m Draft Draft Opportunities • Re duc e WSE o n the Bla nc ha rd Rive r Co nc e pt • Po te ntia l c o st sha ring with RR fo r re pla c e me nt De sig n Ana lysis Challenges • Minima l rise a va ila b le - tie in to side stre e ts Bla nc ha rd Rive r Mo dific a tio ns Costs RR Bridge Modification Costs Scenario RR Rise Track & Roadway Total 1' Rise $125,000 $130,000 $255,000 RR Bridg e 2' Rise $300,000 $500,000 $800,000 3' Rise $900,000 $2,000,000 $2,900,000 Mo dific a tio n 50' Span Addition $1,000,000 Reduction in WSE? • ~0.05’ fo r 1’ rise • ~0.10’ fo r 2’ rise Draft Draft • ~0.20’ fo r 3’ rise 10
2/5/2017 Bla nc ha rd Rive r Ra ting Curve a t Ma in Stre e t Draft Draft Pe rc e nt o f Wa te rshe d Influe nc e d Draft Draft Dive rsio n E xte nsio n Draft Draft 11
2/5/2017 Dive rsio n Eagle to Lye to Blanchard E xte nsio n Draft Draft Pe rc e nt o f Wa te rshe d Influe nc e d Draft Draft Pe rc e nt o f Wa te rshe d Influe nc e d Draft Draft 12
2/5/2017 Sto ra g e Draft Draft E a g le Cre e k Dry Sto ra g e Draft Draft Hydro g ra ph Co mpa riso ns 11,120 cfs E a g le Cre e k 10,890 cfs 10,680 cfs Sto ra g e Bla nc ha rd Rive r in F indla y Draft Draft Hr 65 13
2/5/2017 Sto ra g e Draft Draft Bla nc ha rd Rive r & Po ta to Run Sto ra g e a t Mt. Bla nc ha rd Draft Draft Hydro g ra ph Co mpa riso ns Mt. Bla nc ha rd Sto ra g e + E a g le Cre e k Sto ra g e Bla nc ha rd Rive r in F indla y Draft Draft 14
2/5/2017 Pe rc e nt o f Wa te rshe d Influe nc e d Draft Draft Draft Co nc e pt De sig ns Re vie we d Bla nc ha rd/ L ye Cuto ff L e ve e E xisting Co nd. 500-Ye a r Ma ximum De pth Draft Draft Co nc e pt De sig ns Re vie we d Bla nc ha rd/ L ye Cuto ff L e ve e With L e ve e 500-Ye a r Ma ximum De pth Draft Draft 15
2/5/2017 Opportunities • Re duc e flo o ding a lo ng L ye Cre e k Co nc e pt Challenges De sig n Ana lysis • I nduc e d flo o ding a lo ng Bla nc ha rd Rive r • Pro pe rty b uyo uts? Cut-o ff L e ve e Costs • ~$8,000,000 fo r c uto ff le ve e (fro m USACE / URS a na lysis) Increase in WSE • 0-2’ Draft Draft 2007 F lo o d Hydro g ra ph Co mpa riso ns Mt. Bla nc ha rd Sto ra g e + E a g le Cre e k Sto ra g e Bla nc ha rd Rive r in F indla y Draft Draft 2007 F lo o d Hydro g ra ph Co mpa riso ns E a g le Cre e k Dive rsio n Bla nc ha rd Rive r in F indla y Draft Draft 16
2/5/2017 • Pa th F o rwa rd Clo sing • Sc he dule • Que stio ns Draft Draft Draft 17
Recommend
More recommend
