What We Do: Wetlands, Wildlife Habitat & Flood Hazards in the Root River Watershed
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1 What We Do: Wetlands, Wildlife Habitat & Flood Hazards in the Root River Watershed presented by Ceil Strauss, State Floodplain Manager DNR Ecological & Water Resources 1
2 EWR Roles In Floodplains Regulatory: Work in Public Waters & Water Appropriation Permits Land Use oversight & guidance: - Shoreland & Floodplain ordinances - Higher standards Floodplain Mapping - Help interpret, determine flood elevations based on best available data - Some FEMA funding to do modeling includes Root River watershed Flood Damage Reduction (FDR) Grants Clean Water / Habitat related
3 DNR EWR AREA OFFICES # 27 Area Hydrologists # # # # Your Main # DNR # # # Ecological & # # Water # # # Resources # # # Contact! # # # 3
4 Boundaries of District 1000 feet from OHWL for lakes 300 feet from OHWL for rivers/streams or floodplain boundary, whichever is greater Shoreland Program
5 Example Shoreland Regulatory Requirements Lot size Structure setbacks (OHWL and bluff line) Vegetation management, Aesthetics / screening
6 Floodplain Regulatory Roles Zoning Authority (city, county or township) - Most important! - Adopts ordinance, enrolls in National Flood Insurance Program (NFIP), administers & enforces, KEEPS RECORDS State Oversight; technical assistance & training; approve ordinances & some data/mapping; coordinate between FEMA & community (& watersheds, HSEM, etc.) Watershed District / Other regional agencies may have overlapping regulations &/or mitigation projects; often key data source FEMA Oversees NFIP (enrolls; can suspend); produces / approves maps & data
7 Top View of Floodway vs Flood Fringe } FLOOD FRINGE } FLOODWAY FLOOD } FRINGE 7
8 FLOODWAY vs FLOOD FRINGE Floodplain FF FW FF 8
9 Floodplain Regulations Floodway Mainly open space uses Flood Fringe: (1) Community determines underlying zoning, (2) have standards to elevate or floodproof Encouraging higher standards - Limit land uses - e.g., no new development - Higher levels of protection - e.g. higher freeboards, no critical facilities, regulate for future floods ( Atlas 14 & meander belts) - Clean water or habitat e.g., buffers, no net loss of storage, reduce runoff (infiltration; impervious surface limits)
10 FEMA Floodplain Maps Root River Watershed Current FEMA Maps 1980s Maps, based on 1970s and 1980s data FEMA s Map Update effort: - Fillmore County: preliminaries out 6/30/11, open house by fall - Houston County: preliminaries expected in September Winona County: Data development in progress
11 Flood Risk Assessment Methods Evolving... Yesterday Today Tomorrow
12 Sample FEMA Map with SFHA National Standard of 100-year flood chosen High Flood Risk Medium Flood Risk Low Flood Risk 12 Zone A & AE (old) Zone A & AE (new) Zone B (old maps) Zone X (shaded) Zone C (old maps) Zone X (unshaded)
13
14 FEMA s Latest Map Update Effort Risk MAP Watershed based at HUC8 level Funding to provide supporting data for A Zones (no flood elevations on FEMA map, but supporting data) Possibly FEMA map updates (Digital Flood Insurance Rate Maps DFIRMs) Non-regulatory products to assist with reducing risk
15 FEMA s Risk MAP Action Discovery FEMA recently added Risk Map Action Discovery meetings in Root River watershed Meeting Dates: - July 9 th (pm) Winona county - July 10 th (am) Houston county - July 10 th (pm) Group meeting at Lanesboro Purpose of meetings: - Talk about flood reduction projects being considered - Can the floodplain data be formatted in a different way to be useful for those projects?
16 Risk MAP HUC8 Study Areas Yellow = Study in-progress Green = 2013 start
17 Risk MAP in Root River Watershed Supporting HEC-RAS models for all A Zones (in progress Houston & Winona modeling done; Houston Co portion QC done by FEMA; Winona portion QC to be done by FEMA) Limited detail models can be used to: - Make zoning decisions - Apply for Letters of Map Amendments (LOMAs) - Evaluate potential projects for: clean water, habitat, reducing risk, etc.
18 FEMA Mapped Floodplains Red=AE Blue=A
19 Detailed in Effective DFIRM Detailed in Preliminary DFIRM Detailed in FEMA Unmodernized layer (aka Q3) Detailed on Paper Maps Estimated 1% Water Surface Elevation (available soon in G.O.O.D.)
20
21 Risk MAP in Root River Watershed With digital flood elevation maps, and LiDAR, can possibly do depth grids or future conditions maps - Public outreach - Higher standards
22 Flood Risk is Seen as Black & White! How Do We Change? IN OUT
23 Percent Chance of Flooding over a 30-yr Period 96% + 11% 26%
24 Manage for Future Floods Adopt preliminary maps and other studies Atlas 14; changing precipitation patterns Regulate to future development / future flood levels Protect the meander belt and other natural systems, where appropriate
25 TP-40: based on 1960 data; less stations; shorter record
26 5-6 TP
27 ~1000-yr events in Southern MN in last decade
28
29 / maps.co.mecklenburg.nc.us/ 3dfz/
30 Protect the Meander Belt Allows river to take its natural course across a valley bottom Reduces streambank erosion and sedimentation City of Farmington example setbacks for floodplain alterations, fill, new underground utilities
31 Protect the Meander Belt Allows river to take its natural course across a valley bottom Reduces streambank erosion and sedimentation
32
33 Example from Pierce County, Washington riparian habitat zone, salmon habitat, spawning and shelter channel migration area (meander protection) 50 buffer
34 Clean Water / Habitat DNR staff from Floodplain program & Stream Habitat program working together on culvert designs. Consideration of: - Geomorphology, and - Positive affects on flood mitigation Related resource: Association of State Floodplain Managers (ASFPM) Natural Beneficial Functions (NBF) committee working on related projects (see
35 Examining Floodplain Connectivity in Three Locations
36 Streams carry water and sediment
37 Drainage Area Whitewater Channel Widths On-channel Culverts y = x R² = Eyota Natural Channels y = x R² = Channel Width Preliminary data plotted
38 Floodplain Conveyance through confinement, no floodplain connectivity Ineffective flow area Typically found approach to increasing conveyance
39 Floodplain Conveyance with minimal connectivity (2 culverts) Preferred Approach: address floods on floodplain
40 In Summary How Can DNR Floodplain Program Help? Guidance with FEMA & State regulatory requirements, & flood insurance Help with higher standards wording Provide best available data on 1% annual chance flood elevations - for zoning decisions, flood insurance requirements and Letters of Map Amendments (LOMAs) Share lessons learned from research and pilot efforts e.g., culvert designs for better habitat/stability, meander belts
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Administrative Procedures Regarding the Application of Flood Damage Prevention A floodplain development permit, conforming to the provisions of the Flood Damage Prevention Ordinance ( the Ordinance, shall