MVP GRANT PROGRAM Flood Mitigation
Interactive Virtual Public Meeting Wednesday, May 26, 7 p.m.
Town of Canton
The meeting will begin shortly.
This meeting is recorded.
VIRTUAL MEETING INSTRUCTIONS
• Members of the public are muted.
• You will be notified when you may unmute and ask questions or share feedback.
• The meeting will close with a question-and-answer session.
You may submit your questions anytime in the chat box or ask them during the Q&A session.
• Participants will be removed for inappropriate behavior.
• This meeting is recorded.
INTRODUCTIONS
MVP SUMMARY
• What is the MVP grant?
• What’s happened so far?
• What’s ahead?
• What are the goals?
• Overview of existing efforts
OUTREACH/ENGAGEMENT EFFORTS
• LOGO
• WEBPAGE
https://www.town.canton.ma.us/869/Flood-Mitigation
• SURVEY
https://cantonma.citysourced.com/servicerequests/create
• PUBLIC WORKSHOP
• SOCIAL MEDIA
• FLOODING BROCHURE
MVP SUMMARY
• Introduction to terminology:
• What is flooding?
• Why should you care?
CLIMATE CHANGE IMPACTS
Precipitation projections, CCVA Part 1, City of Cambridge
(Source: Kleinfelder based on ATMOS projections, Nov.2015)
Other types of
rainstorms that have significant flooding impacts in the region:
• High-intensity, short- duration storms
(e.g., July 10, 2010 storm)
• Longer duration storms (e.g., March 2010 flooding)
• Less frequent, larger storms (rain bombs)
Today’s 100 yr. storm comparable to 2070’s 25 yr. storm
Today’s 25 yr. storm will be comparable to 2070’s 10 yr. storm
CLIMATE CHANGE IMPACTS
Recurrence Intervals
10 - year event ➔ 10% annual recurrence 100 - year event ➔ 1% annual recurrence
Does not translate into once every 10/100 years
Probability of a 100-year event occurring at least once in a 30-year period:
𝑷 = 𝟏 − 𝟏 − 𝟎. 𝟎𝟏
𝟑𝟎≈ 26%
PRESENT-DAY CONDITIONS
Neponset River
Town Center, Forge Pond
Canton Junction
Neponset Street I-95, Exit 23
FUTURE CONDITIONS - 2070
Neponset River
Town Center, Forge Pond
Canton Junction
Neponset Street I-95, Exit 23
RISK VULNERABILITY ANALYSIS
Public Health
Environment Public Safety
Economy and Jobs
HOW DO WE DEFINE FLOOD RISKS
• Area shut-down due to flooding
• Length of time things are shut down
• Cost of flood damages
• Impact on public safety and public health
• Impact on the economy and ability to go to work
Likelihood That Flooding Will Occur Consequences of Flooding
• Based on FEMA maps and a hydraulic model
CANTON’S ASSETS CAN BE IMPACTED
Housing Affordable Housing Senior Facilities
Children Education
Childcare
Municipal Public Safety
Town Hall, Town Departments Transportation
Infrastructure Electricity, Telecommunications Drinking Water
Stormwater Infrastructure, Dams
Community Recreation, Community Centers, Cultural Assets Public Health, Rehabilitation Centers
Community organizations, Faith-based institutions Food Support
ASSETS AT RISK
Our Team assessed the flood risk of
126 community and infrastructure assets under the following flood scenarios
Present-day, 10-year storm (large, but relatively frequent event)
2070 100-year event (very large, rare event with climate change)
DRAFT – Under review (March 2021)
Public feedback on observed flooding
EXAMPLE FOCUS AREA: BOLIVAR POND
# 4: Bolivar Pond (near downtown)
Reason identified:
• High density of community assets
• Highlighted in Capital Improvement Plan as in need of further H+H study (Forge Pond/Shepard/Old
Shepard St. Dams; Rockland St.)
Impacted infrastructure and assets include:
• Bolivar, Mechanic, Rockland, Washington, Pond streets
• Department of Public Works & Public Works garage
• Newell Hagan Court, Concord Ave., and 27 Howard (affordable and senior housing)
• Residential neighborhoods
Flooding and road washout near Waterfall Hills apartment complex
EXAMPLE FOCUS AREA: RESIDENTIAL WEST OF JFK SCHOOL
# 8: Residential neighborhoods west of JFK School
Reason identified:
• Identified by multiple people during Public
Meeting (March 2021); not identified in FEMA or previous flood mapping
• High density of stormwater piped assets scoring high in RVA
• H+H model runs show some present-day
flooding, with flood area extents growing under future scenarios (2070 shown in red)
Impacted infrastructure and assets include:
• Residential neighborhoods (roughly bounded by Cedarcrest and Kings roads, Fairview Road)
TYPES OF SOLUTIONS
NATURE-BASED SOLUTIONS
Nature-based solutions can include strategies such as bioswales, tree boxes, rain gardens, tree canopy, and park space – otherwise known as Green Infrastructure
There are many co-benefits to these solutions, such as shading and cooling, recreational space, and beautiful, green streets and open spaces.
COMMUNITY RESILIENCE PROGRAMS
Community Resilience can be supported by organizations, public health and resource programs, emergency response, and community-building initiatives
By connecting with residents, friends, and family prior to, during, and after climate events, we can enhance one another’s resilience.
Canton Council on Aging Canton Parks and Rec
INFRASTRUCTURE IMPROVEMENTS
Infrastructure can be rebuilt or adapted to better withstand the impacts of flooding.
Roads, dams, stormwater and drinking water infrastructure, and transportation can all be impacted by flooding.
Canton Junction Station Spillway Dam, Neponset St.
BUILDING ADAPTATIONS
Homes, places of work, community assets can be adapted to protect a property against flood impacts. Adaptations can include elevating a structure, wet and dry flood-proofing, moving critical equipment, and site barrier solutions.
INITIAL PRIORITY AREAS – MVP ACTION
Currently using H+H model to assess benefits of potential actions:
• Rte. 138 culvert upsizing and storage opportunities at Messinger Park, Memorial Field (green/gray infrastructure projects)
• Nature-based solutions in Bailey Ct Conservation Area, Beaver Meadow Brook, Steep Hill Brook (natural storage, restoration opportunities at conservation lands)
• Long term road-raising at critical high-traffic crossings (e.g., Neponset St., Washington, Rte. 138)
• Assess viability of outlet modifications and active pond/reservoir controls at Bolivar Pond (forecast- driven operations, optimization)
• Potential expanded regional collaboration with Town of Sharon and Town of Stoughton (i.e., slow and store water, optimize pre-storm releases from upstream water bodies)
Green/gray
infrastructure projects
Nature-based solutions Long term road-raising Active pond/reservoir controls
Regional collaboration with other towns
Q&A
Questions?
www.town.canton.ma.us/869/Flood-Mitigation
SOURCES
Nature based solutions, slide 14: hgtv.com
Community resilience programs, slide 14: Canton Council on Aging Infrastructure improvements, slide 14: Waymarking.com (NorStar) Building adaptations, slide 14: Thefloodcompany.co.uk
