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HomeMy WebLinkAbout200407 CC PresentationFlood Risk Reduction Strategy City Council Meeting April 7, 2020 Task Force Framework Strategy Next steps EdinaMN.gov 2 Outline Staff & Consultants •Ross Bintner –Engineering Services Manager •Jessica Wilson –Water Resources Coordinator •Martha Allen –Water Resources Intern (former) •Sarah Stratton –Senior Water Resources Scientist, Barr Engineering Task Force Members •Nora Davis (co-chair), Lake Cornelia Neighborhood •Kathy Amlaw (co-chair), Lake Edina Neighborhood •Greg Lincoln, Morningside Neighborhood •Michael Platteter, Morningside Neighborhood •Louise Segreto, Indian Hills Neighborhood •Roxane Lehmann, Sunny Slope Neighborhood •Richard Strong, Concord Neighborhood •Richard Manser, Todd Park Neighborhood EdinaMN.gov 3 Task Force Co-chair Nora Davis Edina needs a strong Flood Risk Reduction Plan. We need to be proactive and coordinated across city and community. Residents need to know their flood risk and what they can do to reduce it while not adversely affecting neighbors. The City needs to prepare for the next emergency to protect residents and their homes. Spring rains have begun – so we can’t afford to wait. EdinaMN.gov 4 Task Force Co-chair Kathy Amlaw We had the opportunity to help staff understand flood threat and clarify what timely services and resources we expect. Edina homes should not be threatened by flooding from the City’s own system. While stormwater projects look promising for reducing flooding each must be carefully consider for effectiveness and the tremendous cost associated with each. I look forward to Council support so Edina can be proud that their City is taking actions to reduce flooding.5 Task Force Members / Introductions •12 Meetings, 9 months Value to Staff •Gaps; Service expectations vs. reality •Value and values •Shared language •Common problem, leading the conversation EdinaMN.gov 6 Task Force Technical analysis What is valuable, when? What matters, where, to whom? What is flooding? How we view risk Drivers of increasing flood risk Areas of work EdinaMN.gov 7 Framework Surface water Groundwater Sanitary backflow Pathways to structural flood risk EdinaMN.gov 8 EdinaMN.gov 9 Climate / Natural Environment Varies in time •Short term weather •mid-term season •long term climate Varies in place •Uphill / slopes / low area •Near creek, wetland, lake How we view risk 10 Flood Exposure •Degree to which property, homes, buildings, infrastructure and other asset come into contact with flood water •Depends on runoff, flow, storage, drainage, groundwater, and soils. Varies spatially, Structures near low areas and flow paths are exposed How we view risk EdinaMN.gov 11 Flood Vulnerability •The degree to which exposed assets are unable to resist flooding and are damaged by floods •Depends on the extent of assets on the land, both public and private, and how well it can resist flooding, or limit damage when flooded How we view risk EdinaMN.gov 12 How we view risk Key equation Flood risk = climate x exposure x vulnerability Applied at varying scales; system, class, component City Example: Sanitary system, sanitary sewer lift station, electrical components Personal Example: Dwelling, foundation/basement, individual window well EdinaMN.gov 13 Drivers of increasing risk Leading drivers TOP –Climate change has already, and will expose more assets to flooding in the future. This driver is predicted to overwhelm the other drivers in terms of scale. SECOND –Private and public asset and infrastructure are both exposed and vulnerable. Public infrastructure can define flood exposure for different points in the landscape, and serve as a pathway for private risk EdinaMN.gov 14 Drivers of increasing risk Other drivers THIRD –Most of the land use decisions have already been made, and cannot be unmade, we choose to drain the landscape, connect it to the waters, and develop over waters. There is additional demand for drainage that can reduce vulnerability, but marginally affects flood exposure downstream. FOURTH –There is increasing demand for use of land, imperviousness drives runoff in small storms and marginally affects flood exposure in large storms EdinaMN.gov 15 Areas of Work Technical analysis / quick wins •Infrastructure •Regulation •Outreach and Engagement •Emergency Services Task Force Discussions •What we expect vs. what we get and future vision •Shared view of risk, what we value and personal values •Potential actions / prioritization How we view risk Areas of work Drivers of increasing flood risk EdinaMN.gov 16 Framework FUTURE How we view risk •Systems awareness, changing •Climate x exposure x vulnerability Areas of work •Infrastructure, regulation, outreach & engagement, emergency services •Risk management, temporary storage Key Trends •Climate change, aging infrastructure PAST How we view risk •Reactive, static •probability x consequence Areas of work •Infrastructure and emergency response •Bigger pipes, risk transfers, rescue Key Trends •Drainage, land development EdinaMN.gov 17 Framework We work with the community to comprehensively reduce flood risk; •INFRASTRUCTURE: We will renew our infrastructure and operate it to reduce risk. We will plan public streets and parks to accept and transmit flood waters to reduce the risk and disruption of related city services. •REGULATION: We acknowledge competing demands of land use and addressing drainage, groundwater and surface water issues. We help people solve issues without harming another. •OUTREACH AND ENGAGEMENT: We make flood information available and give people tools for flood resilience. •EMERGENCY SERVICES: We help people prepare for floods, remove people from harm during floods, and recover after floods. EdinaMN.gov 18 Strategy Related Topics •Impervious Surface Planning Commission Proposal •Future Climate Action Plan •2020-21 Budget workplan •2021-26 Capital Improvement Plan •2022-23 Budget Proposed Future Action (Tentatively 4/21) •Scope of service for first comprehensive neighborhood flood risk reduction plan with public engagement ahead of Morningside 2022-23 reconstruction projects and Weber park development EdinaMN.gov 19 Proposed action and next steps 4/7 Proposed Action 1.Approve the Flood Risk Reduction Strategy 2.Authorize a major amendment to Comprehensive Water Resources Management Plan 3.Approve a scope of service for consulted professional services to assist in the planning effort for the major plan amendment EdinaMN.gov 20 Proposed action and next steps