Flood Risk Review (FRR) Meeting. Cumberland County, Pennsylvania Carlisle, Pennsylvania December 5, 2016

Transcription

1 Flood Risk Review (FRR) Meeting Cumberland County, Pennsylvania Carlisle, Pennsylvania December 5, 2016

2 Why are we here today? The Flood Insurance Study (FIS) report and Flood Insurance Rate Maps (FIRMs) for Cumberland County, Pennsylvania are in the process of being updated as part of the Lower Susquehanna Swatara HUC 8 Watershed study. The FRR meeting is an opportunity for FEMA, the community, and partners to examine the new study areas, discuss how the analysis and mapping have changed since previous FIRMs, and work collaboratively to ensure that the needs of the community and its partners are met. 1

3 Agenda Introductions Overview of Risk MAP Program Project Area Study Methodology Overview of Flood Risk Products and Datasets Work Session Review maps Q & A Colonel Denning State Park / The Run, by Harvey Barrison on Flickr 2

4 Overview of Risk MAP Program Key Terms: Flood Insurance Rate Map (FIRM) Flood Insurance Study (FIS) Report Special Flood Hazard Area (SFHA) Flood Zone Base Flood Elevation (BFE) Regulatory Floodway Cross Section 3

5 Flood Zones on the FIRM Floodway Zone AE Zone A Zone X Shaded Zone X 4

6 Overview of Risk MAP Program Provides communities with flood information and tools they can use to Reduce risk Enhance their mitigation plans Better protect their residents Develops accurate flood maps, risk assessment tools, and outreach support Beyond the basic flood hazard information of regulatory flood hazard products 5

7 Overview of Risk MAP Program Risk Mapping, Assessment and Planning Builds on Map Mod digitized Flood Insurance Rate Map (FIRM) successes Increases public awareness and action that reduces risk to life and property Watershed approach Regulatory products: Flood Insurance Study (FIS) report and FIRM (flood study updates) New, non-regulatory Flood Risk Products and Datasets 6 Mapping Assessment Planning

8 Mitigation: What is it? To reduce or eliminate long-term risk to people and their property from hazards. Can occur before, during, and after a disaster. FEMA encourages local governments to develop Hazard Mitigation Plans: To increase public and political support and commitment for mitigation To be eligible for Hazard Mitigation Assistance grants Use new Risk MAP information to update your Hazard Mitigation Plan 7

9 Hazard Mitigation Builds Sustainable, Resilient Communities Sustainability meets the needs of the present without compromising the ability of future generations to meet their own needs. Indicators of sustainability are social, economic, and environmental health. Sustainable communities minimize the exposure of people and property to risk by planning for and mitigating against natural disasters. Sustainable communities are disaster-resilient! 8

10 Risk MAP and Community Resilience Critical to implementing FEMA s mission: to support our citizens and first responders to ensure that as a nation we work together to build, sustain, and improve our capability to prepare for, protect against, respond to, recover from, and mitigate all hazards. 9

11 Project Area Nearly all of Cumberland County is in the Lower Susquehanna Swatara Watershed. This watershed was updated as part of a larger study to unify Susquehanna River profiles from the Maryland State line to the Dauphin/Northumberland County line. 10

12 Study Methodology 11

13 Study Methodology 12

14 Study Methodology 13

15 Study Methodology 14

16 Study Methodology 15

17 Study Methodology 16

18 Study Methodology 17

19 Study Methodology During Redelineations 3 Problem Areas Identified. (Long Pine Run, Yellow Breeches Creek, and Trindle Springs Run) New H&H Flood Studies Area1: Long Pine Run Area 2: Yellow Breaches Creek 18

20 Study Methodology During Redelineations 3 Problem Areas Identified (Long Pine Run, Yellow Breeches Creek, and Trindle Springs Run) New H&H Flood Studies Area 3: Trindle Springs Run Cedar Run: Floodplain Revised to 1-foot Contours 19

21 Zone A Floodplains Zone A: based on approximate analysis Used in areas with low development or low development potential Old methods Flood prone quads Hydric soils Average depth Best guess??? Modern methods Automated H&H 20

22 Zone A Restudy Base Level Study o USGS Regression equations used for the hydrology o Hydraulics- cross-sections generated from LiDAR: Automated processes Does not include information below normal water surface No structures are modeled No Floodway or Base Flood Elevations Engineering models available from FEMA Library 21

23 New Structures Identified During Mapping New Structures Identified During Mapping Stream Note / Issue Details Condoguinet Creek Re Oriented Structure The structure over Lambs Gap Road seem re aligned on aerials compared to USGS quadrangle maps. Condoguinet Creek New Structure New structure for McClures Gap Road was noted on aerials which is not shown on Flood Insurance Study (FIS) profile Trindle Spring Run Trindle Spring Run Trindle Spring Run Hogestown Run Hogestown Run Hogestown Run New Structure New Structure New Structure New Structure New Structure New Structure New structure for Warm Sunday Way was noted on aerials which is not shown on FIS profile New structure for Railroad was noted on aerials which is not shown on FIS profile New structure for Private Driveway was noted on aerials which is not shown on FIS profile New structure for Foot Bridge was noted on aerials which is not shown on FIS profile New structure for Private Driveway was noted on aerials which is not shown on FIS profile New structure for Private Driveway was noted on aerials which is not shown on FIS profile Potteiger Run New Structure New structure for Private Driveway was noted on aerials which is not shown on FIS profile. This area was revised by LOMR B462P Potteiger Run Letort Spring Run Burd Run New Structure New Structure New Structure New structure for Private Driveway was noted on aerials which is not shown on FIS profile. This area was revised by LOMR B462P New structure for Foot Bridge was noted on aerials which is not shown on FIS profile New structure for Private Driveway was noted on aerials which is not shown on FIS profile Long Pine Run Yellow Breaches Creek New Structure New Structure New structure for Private Driveway was noted (just downstream of Kunkleman Lane) on aerials which is not shown on FIS profile A new inline structure was noted upstream of Petersburg Road near effective lettered Cross Section "DJ" Trout Run Burd Run Long Pine Run New Structure Relocated Structure New Structure A newstructure for Merrimac Avenue was noted on aerials between effective BFEs of 438' and 441'. This structure is not shoiwn on FIS profile Structure for Conestoga Dr seem to be relocated when compared to effective FIRMs and USGS Quadrangle Maps New structure for Foot Bridge was noted on aerials between Airport Road and Railroad 22

24 Program Product Comparisons Traditional Regulatory Products DFIRM Database Products (FIRM, Flood Insurance Study report) used for floodplain management and insurance purposes as part of the National Flood Insurance Program (NFIP). Map Modernization 23

25 Program Product Comparisons Non-Regulatory Flood Risk Products DFIRM Database Risk MAP Use for Flood Risk Mitigation Planning Map Modernization 24

26 Flood Risk Products Flood Risk Map Illustrates an overall picture of flood risk Flood Risk Report Explains the concept of flood risk Identifies useful tools and reference materials Flood Risk Database Data for the community to incorporate into local GIS layers to visually communicate flood risk 25

27 Flood Risk Datasets Flood Depth & Analysis Grids Changes Since Last FIRM Water Surface Elevation Grids Flood Risk Assessment Areas of Mitigation Interest 26

28 Flood Depth & Analysis Grid Better information on depth and chance (in percents) of flooding More information on multiple flood event frequencies (10-, 50-, 100-, 500-year floods) Provide enhanced data to develop a more accurate Benefit Cost Analysis (BCA) for mitigation projects, a big step toward implementation 27

29 Changes Since Last FIRM Communities and homeowners can use this tool to identify the impacts of new maps on the regulatory Special Flood Hazard Area (SFHA) Also reveals new areas that may need mitigation actions either for existing assets or for future planning 28

30 Water Surface Elevation Grids Provides the ability to see vertical changes in the water surface elevation between the existing FIRM and the revised FIRM This dataset is the equivalent of the Changes Since Last FIRM (CSLF) dataset, but has a vertical analysis of the changes, as opposed to a horizontal analysis 29

31 Flood Risk Assessment Identifies areas of higher flood risk by census block Quantifies potential future flood losses to existing structures Improves ability to identify areas that would benefit from higher building code requirements Supports mitigation plan updates and disaster recovery planning through improved risk quantification 1% Chance Risk (100-year) 30

32 Areas of Mitigation Interest Areas that may be contributing (positively or negatively) to flooding and flood losses in the Flood Risk Project Areas of Mitigation Interest (AoMIs) are identified through coordination with local stakeholders, analyses, other studies, hazard mitigation plans, floodplain management plans, local surveys, flood claims, disaster grants, and other data 31

33 Flood Risk Products Use: Emergency Management Accessibility to at-risk areas from critical facilities Industrial/manufacturing plants in the floodplain Vulnerable populations Characteristics that make communities more/less vulnerable to flood risk 32

34 Flood Risk Products Use: Community Development Know Your Line High Water Mark Initiative Residential/commercial density in the floodplain Location/inundation area of historic events Total properties with insurance policies and as a percentage of the population Areas of increasing population growth Areas requiring protection 33

35 Flood Risk Products Use: Hazard Mitigation Planning Local hazard mitigation plans (HMPs) must be updated every five years Coordinated and participative Planning Process Use new Risk MAP information to update local HMP: Flood Hazard Profile Risk Assessment Refer to the Plan & Keep it Current Mitigation Planning Cycle Identify hazards that can affect the jurisdiction Mitigation Strategy Adopt the plan and implement the mitigation strategy Assess the risks from these hazards Develop strategy to mitigate the risks 34

36 Where Can I Find My Flood Maps? The FEMA Map Service Center (MSC) is the official public source for flood hazard information produced in support of the NFIP: 35 Preliminary, Effective, and superseded FIRM & FIS available Enter an address for location search Search for FIS/FIRMs

37 Accessing Flood Risk Products 36

38 The National Flood Hazard Layer (NFHL) FEMA GeoPlatform Draft flood dataset available for Cumberland County showing changes to horizontal context of the floodplain. 37

39 FEMA GeoPlatform: 38

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41 Project Timeline and Schedule Discovery Meeting 4/7/2015 FRR Meeting 12/5/2016 Preliminary Issuance Summer 2017 CCO Meeting Appeal / Protest Period 90 Days (starts after second posting in the Federal Register) LFD (start of 6-month ordinance adoption/ compliance period Resilience Workshop Effective Maps 40

42 Key Takeaways Communicate Risk New FIRMs and flood studies are coming your way. Invest Wisely Inform Your Planning Implement Forward- Thinking Mitigation Actions 41

43 Discussion We want to hear from you! What are areas of recent or planned development or high growth or other significant land changes? What other flood risks are there? What mitigation plans and projects are underway? How will you use the Risk MAP products? What are your community s concerns? How can we (both FEMA and you) communicate risk within your community and increase resilience from floods? 42

44 For More Information FEMA Region III Lee Brancheau, GISP Regional Project Monitor / Geographer Legrande.Brancheau@fema.dhs.gov Nicole Lick, CFM Branch Chief Floodplain Management and Insurance Nicole.Lick@fema.dhs.gov Molly Kaput Mitigation Planning Specialist Molly.Kaput@fema.dhs.gov Dave Bollinger Mitigation Outreach Coordinator, David.Bollinger@fema.dhs.gov Mapping Partner Kim Dunn, PE, CFM Project Manager Dewberry kdunn@dewberry.com Pennsylvania NFIP Coordinator Daniel Fitzpatrick, CFM PA Department of Community & Economic Development dafitzpatr@pa.gov

45 Work Session Computer station available for viewing draft floodplain mapping Answer questions Talk about mitigation actions in your community Thank you for your participation! Scenic view of Cumberland County from Fowlers Hollow, by Jonathan Smith 44

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