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Levee Removal/Setback for Flood Risk Reduction in the … · · 2013-07-28Policy, Funding and...
Transcript of Levee Removal/Setback for Flood Risk Reduction in the … · · 2013-07-28Policy, Funding and...
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Montgomery Associates: Resource Solutions, LLC
Levee Removal/Setback for Flood Risk Reduction in the
Upper Mississippi River Basin:
Policy, Funding and Implementation Issues
Michael Schwar, Ph.D. PE (MARS) Eileen Fretz (American Rivers)
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Montgomery Associates: Resource Solutions, LLC
Implementing Nonstructural Solutions for Flood Management in the Upper
Mississippi River Basin – Project Tasks
• Policy Evaluation • Funding Evaluation • Success Stories • Surveys of Floodplain Regulators and
Floodplain Managers •Modeling Analysis
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Upper Mississippi Watershed
• Portions of eight states
• 190,000 mi2
• Floods driven by rainfall and/ or snowmelt
• Generally low gradient, wide flat floodplains
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Benefits of Levee Setbacks
• Removal of structures from at-risk areas •Hydrology
– flood flow storage •Hydraulics
– reduced constriction reduces flood levels
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General Nonstructural Floodplain Management Policy Observations
• Primary Federal policy drivers are FEMA (NFIP and Hazard Mitigation) and USACE (PL 84-99 and Comprehensive Plan)
• Floodplain regulations and responsibilities vary from state to state, but state regulators feel their are appropriate – no desire to try to revise
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Identified Funding Mechanisms
• Federal – FEMA (grant programs) – NRCS (WRP) – USACE (PL 84-99, PAS) – USFWS (Partners, NAWCF) – HUD (CDBG) – EPA (WPDG, 319(b))
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Identified Funding Mechanisms
• Private – Nature Conservancy – The Conservation Fund – Iowa Natural Heritage Foundation – Sand County Foundation – Local or Regional Land Trusts and
Conservancies – Wildlife Conservation Groups – Industry
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Identified Funding Mechanisms
• State – Illinois •Partners for Conservation Ecosystems Program •Water Resources Planning Program
– Minnesota •Flood Damage Reduction Program
– Wisconsin •Municipal Flood Control Grant Program
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FP Manager Survey Results • General public not generally tuned in, not
aware of their risk • Opportunities exist immediately after
floods • Federal program processes do not foster
the use of nonstructural practices (timelines, B/C protocols)
• Need to incentivize private participants • Important to consider local economic
impacts
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Montgomery Associates: Resource Solutions, LLC
Implementing Nonstructural Projects in the UMRB
• Plan Ahead • Capitalize on Multiple Benefits • Act when the Opportunity Arises
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Montgomery Associates: Resource Solutions, LLC
Implementing Nonstructural Projects in the UMRB
Plan Ahead • Identify potential projects • Coordinate with potential stakeholders • Identify requirements and limitations of
various programs • Develop an implementation plan
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Montgomery Associates: Resource Solutions, LLC
Example #1 - Planning Ahead Pershing State Park/Locust Creek
Floodplain (Linn County, MO)
• Levee Setback – 1428 acres adjacent to
state park – Previously identified in
multiple plans – Landowner eventually
expressed interest – Multiple funding
sources – Coordinated by NGO
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Example #2 - Planning Ahead Milwaukee MSD Watercourse Planning
and Green Seams Program (WI)
• Flood Management – Buy out flooded
structures – Implement ordinance – Regional storage – Structures in developed
areas – Specific open area
(floodplain) acquisition
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Montgomery Associates: Resource Solutions, LLC
Implementing Nonstructural Projects in the UMRB
Capitalize on Multiple Benefits
– Risk Reduction – Natural Resources – Recreation – Open Space – Water Quality
Expands the pool of potential partners and/or funding sources
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Example #3 - Multiple Benefits Vermillion River Corridor Plan
(Dakota County MN) • River Corridor Planning
– Comprehensive approach •WQ •Recreation •Habitat •Resiliency
– Meander belt serves to reduce at-risk structures Dakota County, MN
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Example #4 - Multiple Benefits Emiquon Preserve (Havana IL)
• Floodplain Restoration – Historically leveed former
drainage district on Illinois River
– TNC developed partnerships with USFWS, NRCS, USACE
– Economic analysis – Provide habitat, recreation
and ultimately reconnection
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Montgomery Associates: Resource Solutions, LLC
Implementing Nonstructural Projects in the UMRB
Act when opportunity arises
– Coordinate interested parties – Utilize capabilities of various stakeholders •Flexibility of NGOs •Objectives of government agencies/programs •Technical expertise to deliver projects
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Montgomery Associates: Resource Solutions, LLC
Example #5 - Timely Response Gays Mills Recovery (WI) • Relocation out of Floodplain
– Village of 600 endured repeated flooding, 2008 event was last straw
– FEMA developed LTCR plan – Communicated a coherent
vision – Assistance from state staff – HGMP used to acquire 32
structures WI DNR
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Example #6 - Timely Response Louisa Levee District 8 (Wapello IA)
• Levee Removal – Response to
repeated flooding – Acquisition by
wildlife refuge – Multiple interested
parties – NGO facilitated
transactions
(U.S. FWS)
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Encouraging Levee Setbacks and NSFM Projects in UMRB • Encourage Local Practices that “Live with the
River” – agricultural production – local ordinances – modeling tools
• Develop a Framework that Supports Project Implementation in the Wake of Future Flood events – planning and coordination – information clearinghouse – reform Federal B/C analysis approaches – strengthen effectiveness of FEMA post-disaster
programs
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Additional Slides - Modeling
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Motivation
• American Rivers was looking for a method to quantify flood reduction benefits of restoring floodplain volume (removing levees) in Upper Mississippi River Basin
• Looked at three different watersheds (MRBI focus) – Spoon River, IL – Middle Minnesota River, MN – Cedar River, IA
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Model
•Hydrologic Simulation Program Fortran (HSPF) – Meteorologic records input – Flow generated from land surface – Routed through stream reaches
• Continuous, generates synthetic gage records (hourly time step) which can be analyzed similar to gage records
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Model • Hydrologic Simulation Program Fortran
(HSPF) – Meteorologic records input – Flow generated from land surface – Routed through stream reaches
• Continuous, generates synthetic gage records (hourly time step) which can be analyzed similar to gage records
• Watersheds identified had existing HSPF models developed and calibrated by others (Cedar River TMDL)
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Methodology
• Run the model, develop “baseline hydrographs” throughout watershed
• Add representation of storage areas to model (various scenarios)
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Conceptual Scenario
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Methodology
• Run the model, develop “baseline hydrographs” throughout watershed
• Add representation of storage areas to model
• Rerun model, look at hydrograph changes
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Montgomery Associates: Resource Solutions, LLC
Methodology
• Run the model, develop “baseline hydrographs” throughout watershed
• Add representation of storage areas to model
• Rerun model, look at hydrograph changes
• For flood study, used annual peak flow analysis
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Results
• Relevant factors – – Volume storage vs. stream flow – Location of storage vs. benefit observed – Elevation of restored floodplain
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Reduction in Annual Flows
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Montgomery Associates: Resource Solutions, LLC
Results • Relevant factors –
– Volume storage vs. stream flow – Location of storage vs. benefit observed – Elevation of restored floodplain
• Benefits primarily for small to moderate events (<20 year recurrence), with some exceptions
• Minimum restored subbasin area ~1-2% to see benefits
• Seem to be generally applicable in investigated watersheds
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Frequent (2-10 year) Floods
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What We’d Like to Do Next
• Cedar River – Try in other subwatersheds – Use actual project locations – Extend meteorological record (1994-2005) – Develop other benefit analysis techniques •Habitat •Water quality
• Elsewhere in Midwest to investigate general applicability