resilient watersheds: climate adaptive stormwater ...€¦ · 2018-11-02 · excessive urban...
TRANSCRIPT
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Resilient Watersheds: Climate Adaptive
Stormwater Management for Waters & Wildlife
Part Two:
Regenerative Stormwater Conveyance: Mill Creek Project Overview
***Thursday, October 11, 2018
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Cumberland River Compact Model Forest Policy Program 2
Logistics:
Participants are muted for audio quality
Use chat box for comments and sharing resources
Use Q&A panel for questions
Download slides and handouts from notes panel
Webinar recording will be shared
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Resilient Watersheds: Climate Adaptive
Stormwater Management for Waters & Wildlife
Three-Part Short Course:
1. Adaptive Stormwater Strategies for Extreme Weather Resilience - Tues, Oct 2, 2018
2. Regenerative Stormwater Conveyance: Mill Creek Case Study - Thur, Oct 11, 2018
3. Getting Started with Local Adaptive Stormwater Management - Tues, Oct 16, 2018
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Ph
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Resilient Watersheds: Climate Adaptive Stormwater Management
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Protect the health and enjoyment of the Cumberland River and its tributaries through education, collaboration, and action.
Build the capacity of communities to be climate resilient by sustaining water resources, productive forests, citizens’
wellbeing, and thriving economies.
Teach Restore Connect
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Resilient Watersheds: Climate Adaptive Stormwater Management
Gwen Griffith, DVM, MS
Model Forest Policy Program
& Cumberland River Compact
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Climate Solutions University (MFPP)
Adaptation planning director
Project manager
Climate adaptation
Watershed resilience
Adaptive stormwater management
Building Outside the Box (CRC)
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Resilient Watersheds: Climate Adaptive Stormwater Management
Steve Casey, PE, CPESC
Civil and Environmental Consultants, Inc.
Nashville, TN
Principal Engineer
Civil Engineer, Water Resources Focus
Stormwater Management & Erosion Control
Hydrologic Modeling / Basin Analysis
Floodplain Management
TN Erosion & Sediment Control Handbook
NPDES Compliance Services / MS4 Permits
Instructor, TDEC Level 2, Erosion Prevention and Sediment Control for Construction Sites
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Mill Creek Project
Project Collaborations: Williamson County Schools Nolensville High School University of Tennessee, Knoxville Civil and Environmental Consultants, Inc. Viking Products, Inc. Jones Company
Funding Partners:
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Topics:
Mill Creek Project Overview
Site Analysis & Stormwater Retrofits
Regenerative Stormwater Conveyance
Review Interactive Homework
Interactive Exercises Part 2
Session 2:
Regenerative Stormwater Conveyance: Mill Creek Case Study
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Increasing frequency of extreme weather impacting watersheds, wildlife, & water resources
Proactive measures to reduce and prepare for unavoidable impacts
Storms – Floods - Droughts – Wildfire
Changes will continue for decades
Why Resilient Watersheds?
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https://science2017.globalchange.gov
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Cumberland River Compact Model Forest Policy Program 12
Resilient Watersheds: Climate Adaptive Stormwater Management
Excessive urban stormwater runoff
Reduced groundwater recharge
Pollutants from lawns, parking lots, construction sites, chemicals, vehicles, sewer overflows, etc.
Streambank erosion
Stream modifications
More frequent, intense floods
More frequent, intense droughts
Impacts to Urban Streams from Built Infrastructure
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Resilient Watersheds: Climate Adaptive Stormwater Management
Warmer air and water temperatures
Heat stress and low dissolved oxygen
Frequent, intense rainfall & flood events
More extreme stormwater runoff volume
More water pollution and erosion
Reduced groundwater recharge
More severe drought events
More rain and less snow
Changes in seasonal timing for stream flow, plant, animal, and insect life cycles
Impacts to Urban Streams from Shifting Weather Extremes
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A Threat Multiplier
Photo: Jimmy Smith
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Cumberland River Compact Model Forest Policy Program 14
Resilient Watersheds: Climate Adaptive Stormwater Management
The result of altered flow regimes, not just water quality:
Frequent flash flooding
Eroded, unstable water channel
Degraded water quality
Impaired aquatic habitat
Reduced biological diversity
Imbalance of aquatic species
Reduced base flow to stream
More intense drought events
Urban Stream Syndrome
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Mill Creek Watershed
~~~~~~~~~~~~~~~
108 square miles, 69,000 acres
Rapid urbanization
Urban refugia for wildlife
Impairments: pathogens, dissolved oxygen, siltation, and nutrients
Frequent severe flooding
Federally endangered Nashville crayfish (Orconectes shoupi)
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US
Arm
y C
orp
s o
f En
gin
eers
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Cumberland River Compact Model Forest Policy Program 16
Resilient Watersheds: Climate Adaptive Stormwater Management
Wide-scale use of multiple layers of watershed stewardship that restores a natural flow regime:
Land use planning and management
Low impact development practices
Stormwater policy, regulations, and program implementation
Green infrastructure and regenerative stormwater control that mimics natural hydrology
How to Cure the Urban Stream Syndrome?
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Cumberland River Compact Model Forest Policy Program 17
Resilient Watersheds: Climate Adaptive Stormwater Management
… …. climate adaptive stormwater management is a component of adaptive management to address trends in weather extremes of temperature and precipitation
… regenerative stormwater management restores natural hydrology to optimize watershed function and ecological health
Watershed Resilience:
What do we mean by adaptive or regenerative stormwater management?
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Cumberland River Compact Model Forest Policy Program 19
Resilient Watersheds: Climate Adaptive Stormwater Management
Mill Creek Resilience Project Goals:
Increase climate resilience of Mill Creek waters and wildlife, a priority urban stream
Demonstrate a suite of restoration and regenerative stormwater control measures that address impacts of weather extremes and development
Provide education at all levels from elementary, middle, and high school students, to training of professionals, elected officials, businesses, educators, and landowners
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Cumberland River Compact Model Forest Policy Program 20
Resilient Watersheds: Climate Adaptive Stormwater Management
Short Course Learning Objectives:
Increased awareness of impacts of extreme weather and development on aquatic habitat & water resources
Understand the methods and benefits of climate adaptive stormwater control measures
Catalyze replication of regenerative stormwater conveyances at the watershed scale necessary to protect stream health from development and extremes of temperature and precipitation
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Mill Creek Conservation Opportunity Area
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Endangered Nashville Crayfish (Orconectes shoupi)
Project Site
Nashville
Threats:
Stormwater runoff
Sedimentation (construction)
Stream modifications
Bioaccumulation of contaminants
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Mill Creek
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Mill Creek Project Overview
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Nolensville High School Campus
***
Mill Creek Headwaters
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Mill Creek
Nolensville High School Campus
Mill Creek Headwaters
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Resilient Watersheds: Climate Adaptive Stormwater Management
Bioretention Zone #1 – Parking Island
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Before
After
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Bioretention Zone #2 – Lawn Drain
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Before
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Resilient Watersheds: Climate Adaptive Stormwater Management
One Regenerative Stormwater Conveyance (RSC)
27Photos: CRC
Before
After
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Green Way & 2 Foot Bridges
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Cumberland River Compact Model Forest Policy Program
Resilient Watersheds: Climate Adaptive Stormwater Management
Numerous sites for planting trees and vegetation in buffer zones
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PRESENTATION TITLE HERE 30
Project Co-Benefits Educational Programs
• Working with Williamson County Schools,
principals, teachers, facility managers, and
developers
• Classroom and outdoor programs
• River Talks – Public lectures
• Public site tours and signage
• Professional training workshop
• Virtual short course
• MS4 regulatory compliance
High School
Middle School
Elementary School
Co-Benefits
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Cumberland River Compact Model Forest Policy Program 31
Questions?
Comments?
Observations?
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Resilient Watersheds: Climate Adaptive
Stormwater Management for Waters & Wildlife
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Resilient Watersheds: Climate Adaptive Stormwater Management
Steve Casey, PE, CPESC
Civil and Environmental Consultants, Inc.
Nashville, TN
Stormwater Retrofits at Nolensville High
School
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Cumberland River Compact Model Forest Policy Program 33
Resilient Watersheds: Climate Adaptive Stormwater Management
Questions to explore opportunities for local implementation
Handout provided with questions and resources to investigate
Share your findings in the third and final webinar
Regenerative Stormwater Local Questions – Part 2
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Cumberland River Compact Model Forest Policy Program 34
Resilient Watersheds: Climate Adaptive Stormwater Management
What are the anticipated priority climate risks for your region?
What are your local weather trends now and future projections?
What are the exacerbating stressors for your community or jurisdiction? Population? Impervious cover?
Who are local resilience leaders and what is already being done to address your climate risks and non-climate stressors?
Regenerative Stormwater Local Exploration – Stage 1
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Cumberland River Compact Model Forest Policy Program 35
Resilient Watersheds: Climate Adaptive Stormwater Management
1. What are the priority climate risks identified for your region? List the top 3-5 issues. Are you feeling the impacts now? How? What non-climate stressors exacerbate these risks?
Fourth National Climate Assessment: Regional Summarieshttps://www.globalchange.gov/nca4
EPA State Summaries – (EPA archived website)https://archive.epa.gov/epa/climate-impacts/climate-change-impacts-state.html
Your State Climatologist
State or local climate adaptation plans or reports
Regenerative Stormwater Take Home Exercises
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Climate Change in Tennessee
Rising Air Temperatures - Average up 2 Fahrenheit since 1970 More evaporation and drier soil conditions between rainfall Droughts more severe and prolonged – 2007, 2012, 2016 Lower Water Levels – Impacts habitat, reduces shipping and TVA power generation
Rising Water Temperatures – Impacts aquatic life, lower oxygen, thermal stress, and algal blooms
Increased Flooding - Heavy rainfall more frequent and intense Chattanooga flood of 2003 / Nashville flood of 2010 Increases pollution and damages water quality
Agriculture – longer growing seasons, heat & drought reduce crop yields, stress livestock Forests – tree composition will change, increased damage from disease and insects Human Health – heat waves, air quality problems, food, water, and insect-borne disease
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TDOT Extreme Weather Vulnerability Study
Selected Risk Findings: Extreme Weather Floods and Landslides, Heat Waves and Drought Trend Analysis Upward Damage to InfrastructureChanging Construction Specifications
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Cumberland River Compact Model Forest Policy Program 38
Resilient Watersheds: Climate Adaptive Stormwater Management
2. What are your county level weather trends and projections for temperature and precipitation changes through 2100?
Number of extreme heat days over 95 degrees F now? In 2050? In 2100?
Number of extreme rain events > 3 inches in 24 hrs. now? In 2050? In 2100?
NOAA Climate Explorer
https://toolkit.climate.gov/tools/climate-explorer
NOAA National Centers for Environmental Information / State Summarieshttps://statesummaries.ncics.org/ (2014)
•
Regenerative Stormwater Take Home Exercises
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https://crt-climate-explorer.nemac.org/
County Level Observations and Projections
***Temperature Precipitation
Heating/Cooling Growing Days
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Williamson County, TN - Temperature
Annual # of days with maximum temp above 100˚F
< 20 days thru 2000 / 60-80 days by 2050
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Williamson County, TN - Precipitation
Annual # of days with rainfall > 3 inches
< 1 days thru 2000 / 2-4 days by 2050
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Cumberland River Compact Model Forest Policy Program 42
Resilient Watersheds: Climate Adaptive Stormwater Management
3. What are the non-climate stressors for your community or jurisdiction? Population trends? impervious cover?
U.S. Census population trends https://www.census.gov/
Impervious cover percentages and trendsUSGS National 100-meter land cover map https://nationalmap.gov/small_scale/mld/impe100.html
Regenerative Stormwater Local Exploring – Stage 1
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Cumberland River Compact Model Forest Policy Program 43
Resilient Watersheds: Climate Adaptive Stormwater Management
Town of Nolensville, TN - 37% growth since 2010
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Cumberland River Compact Model Forest Policy Program 44
Resilient Watersheds: Climate Adaptive Stormwater Management
4. Who are local resilience leaders? What is already being done to address your climate risks and non-climate stressors?
Local government agencies or programs
Nonprofit environmental, health, or social justice organizations
Business leaders
Regenerative Stormwater Local Exploring – Stage 1
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TN State Wildlife Action Plan (SWAP)
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TN Precipitation & Temperature Forecasts
Average Total Annual Rainfall Increase from 50.1 inches to 53.6 inches
Extreme Heat Baseline1961-2000
Mid-Century2046-2065
Avg. Summer Temp 88.5 F 94.8 F
Highest 7-Day Avg. 94.9 F 101.9 F
# Days Above 95 F (Annual)
10 days 59 days
# Days Above 100 F (Annual)
1 day 16 days
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Resilient Watersheds: Climate Adaptive Stormwater Management
Take a drainage detective walk around your building and document where the stormwater runoff goes. Any problems? Improvements?
Ask a civil site engineer the pros and cons of an inverted parking lot island for bioretention.
Identify a small stream with signs of urban stream syndrome, delineate the drainage basin, and consider restoration strategies.
What do you know about the NPDES stormwater permit for your community? Does the stormwater committee consider climate projections in permit decisions?
Consult NOAA Atlas 14 for the rain depth of your local 100 year / 24 hour design storm.
Regenerative Stormwater Local Exploring – Stage 2
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Drainage basin delineation to the Mill Creek
project site 3.22 sq. mi.
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Resilient Watersheds: Climate Adaptive
Stormwater Management for Waters & Wildlife
Three-Part Short Course:
1. Adaptive Stormwater Strategies for Extreme Weather Resilience - Tues, Oct 2, 2018
2. Regenerative Stormwater Conveyance: Mill Creek Case Study - Thur, Oct 11, 2018
3. Getting Started with Local Adaptive Stormwater Management - Tues, Oct 16, 2018
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Resilient Watersheds: Climate Adaptive Stormwater Management
Upcoming Speakers
Catherine Price
Education Program Manager
Cumberland River Compact50
Jon Hathaway, PhD, PE
Civil & Environmental Engineering
University of TN, Knoxville
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Resilient Watersheds: Climate Adaptive Stormwater Management
Webinar #3: October 16, 2018
Getting Started with Local Adaptive Stormwater Management
Priorities, processes, and partners
Watershed hydrology - scaling up to watershed scale
Co-benefits of green infrastructure approach
Potential funding sources
Interactive exercises wrap up 51
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Cumberland River Compact Model Forest Policy Program 52
Questions?
Comments?
Observations?
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Resilient Watersheds: Climate Adaptive
Stormwater Management for Waters & Wildlife
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Resilient Watersheds: Climate Adaptive Stormwater Management
Gwen Griffith, DVM, MS [email protected]
Jon Hathaway, PhD, PE
[email protected] and http://hathaway.utk.edu/
Steve Casey, PE, CPESC
Catherine Price,
Cumberland River Compact Model Forest Policy Program 53