1. Flood RecoveryFlood RecoveryLessons Learned Along theLessons Learned Along theWayWayPrepared For:Prepared For:The Cary InstituteThe Cary InstituteMay 4, 2013May 4, 2013By: Delaware County Department of Public WorksBy: Delaware County Department of Public Works

2. Requested topicsRequested topics How has Delaware County responded toHow has Delaware County responded tofloodsfloods Adaptations made to road infrastructureAdaptations made to road infrastructure Introduction to practices outside ofIntroduction to practices outside ofculvertsculverts Success stories and lessons learnedSuccess stories and lessons learned 3. OutlineOutline HistoryHistory EventsEvents Lessons LearnedLessons Learned Solutions that work for Delaware CountySolutions that work for Delaware County 4. Quick HistoryQuick History Open channel flowOpen channel flowTrapezoidal channelsTrapezoidal channelsUniform alignmentsUniform alignmentsLined for scour protectionLined for scour protectionBermed for flood protectionBermed for flood protection January 19, 1996January 19, 1996All new educationAll new education 5. FEMA Declared EventsFEMA Declared Events 11 events in 15 years11 events in 15 yearsJanuary 19, 1996January 19, 1996November 9, 1996November 9, 1996May 13, 2004May 13, 2004September 18, 2004September 18, 2004April 5, 2005April 5, 2005June 26, 2006June 26, 2006November 16, 2006November 16, 2006June 19, 2007June 19, 2007April 26, 2011April 26, 2011August 28, 2011August 28, 2011September 8, 2011September 8, 2011 6. Numerous Undeclared EventsNumerous Undeclared Events June 1996June 1996 July 1998July 1998 July 2008 (FHWA Declared)July 2008 (FHWA Declared) October 2010 (FHWA Declared)October 2010 (FHWA Declared) 7. June 2006June 2006 $14 million in damage$14 million in damage 14 bridges closed14 bridges closed 12 roads closed12 roads closed Wide spread damageWide spread damage Heavy damage on tributaries as opposedHeavy damage on tributaries as opposedto 1996 which involved the main stems into 1996 which involved the main stems inthe headwatersthe headwaters 8. June 2007June 2007 Localized eventLocalized event Watershed: 9.6 square milesWatershed: 9.6 square miles Extremely destructiveExtremely destructive 4 lives lost4 lives lost 1 never recovered1 never recovered Homes were lostHomes were lost 6 to 8 inches of rain in 2 hour period6 to 8 inches of rain in 2 hour periodSome reports of up to 11 in 4 hoursSome reports of up to 11 in 4 hours In excess of $12 million in damageIn excess of $12 million in damage 9. 2011 Event2011 Event 5 Bridges lost5 Bridges lost 20 damaged due to scour20 damaged due to scour Estimated $15 million in damageEstimated $15 million in damage Not as bad as Greene and Ulster CountiesNot as bad as Greene and Ulster Counties 10. Lessons LearnedLessons Learned We have to work with nature, we will notWe have to work with nature, we will notwin a battle with itwin a battle with it Keep big picture in mindKeep big picture in mind Monitor your workMonitor your work Flooding resilience is not cheapFlooding resilience is not cheap Important elementsImportant elementsAlignmentsAlignmentsHydraulic capacityHydraulic capacityScourScourStructure typesStructure types 11. AlignmentsAlignments 12. Town of HancockTown of HancockA Case StudyA Case Study Fish CreekFish Creek County Bridge on a Town RoadCounty Bridge on a Town Road Dead end roadDead end road Drainage Area: 11.29 square milesDrainage Area: 11.29 square miles 13. August 1978August 1978 14. June 1996June 1996 15. Fall 2003Fall 2003 16. Summer 2004Summer 2004 17. April 2005April 2005 18. June 2006June 2006 19. June 2006June 2006 20. Post June 2006Post June 2006 21. November 2006November 2006 22. Summer 2008Summer 2008 23. Summer 2008Summer 2008 24. September 2008September 2008 25. August 2011August 2011 26. August 2011August 2011 27. ColchesterColchester Horse BrookHorse BrookDamaged in 1996Damaged in 1996Cleaned outCleaned outTU poster childTU poster child National recognitionNational recognition DEP sponsored Dave RosgenDEP sponsored Dave RosgenDPW/TU CooperativeDPW/TU Cooperative 28. County Bridge 17-21County Bridge 17-21 Reconstructed in 1998Reconstructed in 1998 Stream Design by TUStream Design by TU Incorporated floodplain drainageIncorporated floodplain drainage Step pool designsStep pool designs Special issues due to confluence withSpecial issues due to confluence withBeaverkillBeaverkill Drainage area: 2.58 Square MilesDrainage area: 2.58 Square Miles Span: 17.3 feetSpan: 17.3 feet Opening: 121.1 square feetOpening: 121.1 square feet 29. Town of HancockTown of HancockLaing RoadLaing Road 30. Town of ColchesterTown of Colchester June, 2007June, 2007 County Route 7County Route 7 Watershed: 9.6 square milesWatershed: 9.6 square miles 31. BR 7-8 32. Watershed AreaWatershed Area .44 Square miles.44 Square miles 281 acres281 acres 33. ScourScour 34. 20072007 35. Watershed AreaWatershed Area 6.69 Square miles6.69 Square miles Span: 48 feetSpan: 48 feet 36. BR 7-5 approach slab 37. Solutions for Delaware CountySolutions for Delaware County Adopt hydraulic and hydrology standardsAdopt hydraulic and hydrology standards Three sided box culvertsThree sided box culverts Floodplain benchesFloodplain benches Floodplain drainageFloodplain drainage Geomorphology designsGeomorphology designsRock vanesRock vanesRoot wadsRoot wadsNatural vegetationNatural vegetation 38. Adopt StandardsAdopt Standards Standards adopted by the BOSStandards adopted by the BOS Our standards are sizing a replacementOur standards are sizing a replacementstructure to pass a Q 50 with 2 feet ofstructure to pass a Q 50 with 2 feet offreeboard or pass Q 100 with gravity flowfreeboard or pass Q 100 with gravity flowwhichever is shorterwhichever is shorter Standards require scour protection for theStandards require scour protection for thedesign stormdesign storm Standard is natural, living bottoms (threeStandard is natural, living bottoms (threesided boxes or bridges as preferredsided boxes or bridges as preferred Strict bridge takeover policyStrict bridge takeover policy 39. Three Sided BoxesThree Sided BoxesAdvantagesAdvantages More capacityMore capacity Square more efficient than roundSquare more efficient than round More scour protectionMore scour protection Better fish passageBetter fish passage Can precast in winterCan precast in winter 40. Floodplain DrainageFloodplain Drainage 41. Town of HamdenTown of Hamden 20112011 Existing Pipe: 9 X 5 elliptical CMPExisting Pipe: 9 X 5 elliptical CMP Watershed Area: 3.06 square milesWatershed Area: 3.06 square miles Q50: 586 cfsQ50: 586 cfs Q100: 681 cfsQ100: 681 cfs Design bankfull width: 16.7 feetDesign bankfull width: 16.7 feet 42. Town of StamfordTown of Stamford 20122012 Watershed Area: 4.69 square milesWatershed Area: 4.69 square miles Original crossing: 6 diameter pipeOriginal crossing: 6 diameter pipe Existing Capacity: less than Q 1.25Existing Capacity: less than Q 1.25 Q 50: 1195 cfsQ 50: 1195 cfs Q100: 1374 cfsQ100: 1374 cfs Construction Cost: $247,000Construction Cost: $247,000 43. Great PartnersGreat Partners Delaware County Soil and WaterDelaware County Soil and WaterConservation DistrictConservation District Delaware County Planning DepartmentDelaware County Planning Department Delaware County Watershed AffairsDelaware County Watershed Affairs New York City Department ofNew York City Department ofEnvironmental ProtectionEnvironmental Protection 44. Design for good wildlife habitat and thereDesign for good wildlife habitat and thereis a very good chance that you will get ais a very good chance that you will get adurable infrastructure.durable infrastructure. Design for durable infrastructure and thereDesign for durable infrastructure and thereis a very good chance that you will get ais a very good chance that you will get adurable infrastructure.durable infrastructure. 45. Life as we knew it seems to have passedLife as we knew it seems to have passed For whatever reason, the climate hasFor whatever reason, the climate haschangedchanged We need to really think about the futureWe need to really think about the future As an engineer, I am convinced that weAs an engineer, I am convinced that weneed to get homes and businesses out ofneed to get homes and businesses out ofthe floodplainsthe floodplains We really need to plan for future safetyWe really need to plan for future safety 46. Thank youThank you