resiliency the new sustainability - pafpm
TRANSCRIPT
WEBINAR SERIES
Resiliency the New Sustainability
Sponsored by
ABOUT US
The Pennsylvania Association of State Floodplain Managers is a statewide organization of floodplain managers, engineers, planners, local, state and federal officials, and water resource professionals whose purpose is to:
• Promote public awareness of integrated floodplain management;
• Promote a liaison and to encourage the exchange of ideas and information among individuals and groups concerned with floodplain management
• Inform concerned individuals and groups of pending floodplain management legislation, regulation, and related matters in order to advance the effective implementation of floodplain management
MEMBERSHIP
A PAFPM membership gives you access to training, workshops, newsletter, conferences, and networking opportunities.
Memberships are valid for 1 year (July 1 - June 30)
Contact us at [email protected] with questions about membership.
NEWS
Just added! FEMA 2020 Non-Disaster Grant Opportunities through PEMASeptember 29, 2020 @ 1PMRegistration @ PAFPM.org
Resiliency the New Sustainability Webinars:Wednesdays in September 2020 @ noonNext Wednesday: NFIP TransformationRegistration @ PAFPM.org
PAFPM- Floodplain Management Training:March 16/17thHarrisburg, PASAVE THE DATE
HOUSEKEEPING
PAFPM Webinars:
• Attendees will be muted during presentations• Presentations will be approx. 1 hour, 30mins for Q&A• Use the Q&A box during the presentation• Certificates will be emailed to attendees• If you encounter any issues during the webinar email us
WEBINAR SERIES
Resiliency the New Sustainability
Sponsored by
RIVERINE
DAM/LEVEE
INCREASED RAINFALL
HURRICANES/TROPICAL STORMS
Types of flooding in PA
SEA LEVEL RISE
URBAN/INFRASTRUCTURE
LAKE
TIDAL
Types of flooding in PA
Flood Resiliency in the News
PRESENTERSKara KalupsonMS4 CoordinatorRETTEW
Mark MetzlerGroup ManagerRETTEW
Funding Options for Municipalities Implementing
Stormwater BMPs
Presentation OutlineTopics
Stormwater, Flooding, and Water Quality
MS4 Permit – Pollutant Reduction Plans
Reducing Sediment, Nitrogen, and Phosphorous
How Municipalities are Funding Projects
Summary
Developed Areas
Impervious Areas – Prevent stormwater infiltration
Water is conveyed offsite to streams via storm pipesToo much water going to the same place
Water flows across the land picking up pollutants
Chemicals – oil, gas, pesticides, medicinalsBacteria – sewage and manureTrashNutrients – including grass clippings
Rural Areas / Farms
Pasture and crop fields adjacent to streamsLivestock access to streams destroys banks
They are all related
Stormwater, Flooding, and Water Quality
2010 Urbanized Area (U.S. Census Data)
MS4 Permit - Pollutant Reduction Plans
Stormwater BMPs
Rain gardens and bioretention basinsBioswales and vegetated swalesDry extended detention basinsConservation landscaping/meadow plantingsRiparian forest buffers and vegetated buffersStream restoration and stabilization
Benefits
Plants reduce stormwater speed and trap sedimentPlants uptake water and nutrients for growthMore groundwater infiltration Increase food and habitat for birds, insects, small animals
Stormwater BMPs to reduce stormwater volume and pollutants
Paradise TownshipDetention Basin Retrofit
PA DEP 2017 Urban Stormwater Best Management Practices Grant
Awarded $142,082 in August 2017
Existing basin deficiencies
Sinkholes
Small storms passed straight through
No water quality treatment
Paradise TownshipDetention Basin Retrofit
Reduces stormwater volumes and rates during storm events
Two sediment forebays filter sediment during small storms
Native grasses filter pollutants and uptake nutrients
Design to drain within 72 hours (3 days)
Sediment reductions = 30,695 lbs/year
Total project cost $252,000.00
Township contribution $50,000.00
Private landowner contribution $60,000.00
Paradise TownshipDetention Basin Retrofit
Paradise TownshipVegetated Swale
Lancaster County Community Foundation 2020 Watershed Implementation Grant
Awarded $27,500 in March 2020
Existing concrete-lined swale
No water quality treatment
Paradise TownshipVegetated Swale
Reduces stormwater volumes and rates during storm events
One sediment forebay filters sediment during small storms before discharging into a detention basin
Native grasses filter pollutants and uptake nutrients
Treats stormwater from 122-acre drainage area
Sediment reductions = 26,320 lbs/year
Total project cost $35,500.00
Township contribution $8,000.00
Rapho TownshipDetention Basin Retrofit
PA DEP 2017 Urban Stormwater Best Management Practices Grant
Awarded $161,360 in August 2017
59-acre drainage area – suburban residential
Existing basin deficiencies
Small storms passed straight through
No water quality treatment
Rapho TownshipDetention Basin Retrofit
Reduces stormwater volumes and rates during storm events
Two sediment forebays filter sediment during small storms
Native grasses filter pollutants and uptake nutrients
Design to drain within 72 hours (3 days)
Sediment reductions = 28,375 lbs/year
Total project cost $171,360.00
Township contribution $10,000.00
Rapho TownshipDetention Basin Retrofit
West Hempfield TownshipVegetated Swale and Bioretention Basins
Lancaster County Community Foundation 2020 Watershed Implementation Grant
Awarded $75,000 in March 2020
Diverting stormwater runoff to a vegetated swale and bioretention basin
Existing stormwater discharges into small stream
West Hempfield TownshipVegetated Swale And Bioretention Basins
Diverts stormwater out of headwaters of a small stream
Native grasses filter pollutants and uptake nutrients
Amended soils promote infiltration
Design to drain within 72 hours (3 days)
Sediment reductions = 18,818 lbs/year
Total project cost $162,000.00
Township contribution $87,000.00
West Hempfield TownshipVegetated Swale And Bioretention Basins
West Hempfield TownshipStormwater Management and Stream Restoration
2019 NFWF Pennsylvania Local Government Implementation Grant
Awarded $200,000 for stormwater management and stream stabilization
Private landowner
UNT Chiques Creek
West Hempfield TownshipStream Restoration
Construct stormwater basin at pipe
Regrade and stabilize eroding streambanks
Riparian buffer – native shrubs and grasses
Sediment reductions = 56,548 lbs/year
Construction 2022
Total project cost $302,000.00
Township contribution $102,000.00
Ephrata TownshipStream Restoration – Cocalico Creek
DCNR - 2019 NFWF Park Rehabilitation and Development – Rivers Conservation Grant
Awarded $200,000
16-acre municipal park along the Cocalico Creek
Stream restoration/floodplain restoration
Riparian buffer
Kayak launch and ADA accessible fishing pier
Ephrata TownshipStream Restoration
Regrade eroding streambanks
Connect floodplain to the stream channel
Riparian buffer – native trees, shrubs, grasses
Sediment reductions = 70,910 lbs/year
Construction 2021
Total project cost $400,000.00
Township contribution $200,000.00
Penn TownshipStream Restoration – Chiques Creek
2019 NFWF Pennsylvania Local Government Implementation Grant
Awarded $200,000 for 1,850 LF stream restoration
Private landowner
Chiques Creek is municipal boundary line –opportunity to share pollutant reduction credits
Penn TownshipStream Restoration
Regrade and stabilize eroding streambanks
In-stream fish habitat structures
Riparian buffer – native trees, shrubs, grasses
Sediment reductions = 83,028 lbs/year
Construction 2022
Total project cost $310,200.00
Township contribution $110,200.00
Mountville Borough
Notified of a $200,000 in September 2020
Strickler Run Watershed
Sediment reductions: 25,818 lbs/year
Constructed Wetland and Dry Extended Detention Basin
Total project cost $250,000.00
Manheim Borough
8-acre municipal park along the Cocalico Creek
Stream Restoration/Floodplain restoration
Riparian Buffer
ADA Pathway
Sediment reductions = 136,358 lbs/year
Construction 2021
Stream Restoration – Chiques Creek
Funding ReceivedDCNR Community Conservation Partnerships $250,000.00
Growing Greener $99,000.00
DCED Greenways Trails Recreation Grant $250,000.00
DCED Watershed Restoration and Protection $300,000.00
Total project cost $1.6 million
SummaryLocal, State, and Federal Grants for Water Quality Projects
Lancaster County Municipality Grant Award
Paradise Township 169,582.00$ Rapho Township 161,360.00$ West Hempfield Township 275,000.00$ Ephrata Township 200,000.00$ Penn Township 200,000.00$ Mountville Borough 200,000.00$ Manheim Borough 899,000.00$
Total 2,104,942.00$
Thank You!
Kara Kalupson, RLA, ASLA, CPMSM, CBLP
Senior MS4 Coordinator
RETTEW Associates, Inc.
717.431.3706
Streams in Equilibrium are Resilient
Mark A. Metzler
Senior Environmental Scientist
RETTEW Associates, Inc.
(717) 723-0486
Stable river (stream) systems maintain a dynamic equilibrium (stable does not mean static)
IN NATURE….1. A stable stream does migrate laterally
A. So expect it to happen and don’t encroach on its “wiggle room”
2. A stable stream system does erode and does deposit materialA. Sediment load, sediment size remain fairly consistent
3. A stable stream system tends to maintain a configurationA. SlopeB. WidthC. DepthD. Sinuosity
4. A stable stream system maintains flow capacity (how much water/sediment load it transports)
5. A stable stream system includes an “attached” floodplain
6. A stable stream system supports its aquatic community
7. A stable stream system has the correct vegetation - trees, shrubs, herbs/grasses (usually)
Want to destroy a stable river (stream) system?
1. Attempt to stop its lateral movement
2. Undo the natural balancing act of erosion and deposition
3. Change its configurationA. SlopeB. WidthC. DepthD. Sinuosity
4. Add more water and make the stream adjust
5. Un-attach its floodplain
6. Aquatic community will change as result
7. Change the riparian vegetation
So we destroyed our stable river (stream) system in a number of ways over a number of years, and some of our manmade creations have to stay because we need it. So now what?
1. All is not lost - you can probably restore the stream and have a new version of equilibrium.
2. Restore, fix, stabilize – How?A. If the stream wasn’t impaired (broken), what would it be like?
ii. Various stream typesB. Can you eliminate any negatively influencing factors?C. What negatively influencing factors are you stuck with and can you accommodate them?
3. Do you have the necessary money, permission, know-how, time and desire?
AS BEST POSSIBLE, DON’T FORCE A STREAM INTO BEING WHAT IT’S NOT…OR WHAT IT SHOULDN’T BE…
Design for:The stream typeThe aquatic community (that should be present)Accommodating those unnatural, influencing factors you can’t eliminate
Legacy Sediment Considerations
Floodplain re-connected
QUESTIONS
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