Stormwater and Landscape A Green Infrastructure Network to Reduce Stormwater Flooding, Reduce Non-Point Source Pollution, & Enhance Community Open Space
VACANT PARCELS
Vision Our vision is to identify opportunities for green infrastructure improvements in North Port St. Joe (NPSJ) to reduce residential flooding, enhance community open space, & improve water quality.
Objectives
Outcomes
• Document & analyze existing hydrologic & infrastructure conditions. • Quantify the amount of water that needs to be captured to reduce stormwater flooding & runoff. • Identify green infrastructurebased strategies to reduce flooding, improve water quality, & enhance community open space at the neighborhood, street and parcel scales.
• The three-tier strategy includes developing stormwater capture and treatment at the neighborhood, street and parcel scale. • Total project stormwater capacity is 7.05 million gallons. • Design has potential to improve water quality through nutrient and other pollutant load reduction.
STORMWATER INFRASTRUCTURE
SEA LEVEL RISE 2100
FEMA FLOOD ZONES
SOIL DRAINAGE
ELEVATION
Process Conversations with the community led us to understand parcel specific locations that struggle with flooding. We used data, including GIS maps of sea level rise, flood zones, elevation, soil drainage, and an AutoCAD map of existing stormwater infrastructure, to support these claims and help us better understand stormwater drainage in North Port St. Joe.
We layered these maps to identify specific streets and parcels that are prone to flooding. Community identified areas with flooding were supported by flood zone and low-lying elevation data. Vacant parcels were identified in areas prone to flooding as possible locations to store and treat stormwater.
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GIS Layers used for Site Analysis
Planning for half a 25-year storm over 100-acres within the North Port St. Joe Neighborhood requires 7.8 million gallons of stormwater capacity.
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Projects that reduce nuisance flooding within NPSJ have the opportunity to create a network of green infrastructure that would mitigate larger flood events such as 100-year storms and sea level rise.
LEGEND Additional locations for parcel-specific green infrastructure Existing Pipes
Bio-retention swales and larger stormwater treatment areas can be used to protect residential areas, historic structures, and community business districts from flooding while reducing nutrient load pollution. This network of green infrastructure can also be used to enhance the open space network in the community, providing places of community gathering and recreation, community beautification, and possibly health-related benefits.
Chicken House Creek Flow Direction
Battles Street
Opportunities also include small-scale stormwater management strategies implemented by individual property owners across the watershed (such as rain barrels and rain gardens).
The design proposes a three-tier approach, addressing flooding on three main scales: 1)
Parcel based stormwater strategies*
Stormwater retrofit of MLK Blvd Parcels
Stormwater retrofit of Vacant Parcels
Stormwater retrofit of residential parcels
2) 3)
Linear stormwater management strategies & improvements on Battles Street Upstream stormwater storage & Downstream treatment
1” = 200’
*NOTE - All properties designated on these maps are used for demonstration purposes only. No specific sites have been designated for retrofit.
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Design Recommendations: Tier 1 Parcel- Based Strategies* Maximum stormwater capacity: 1.2 million gallons with a swale depth of 1’-0”
Residential Retrofit Strategy Bio-retention Swales: Captures & treats stormwater before it enters stormwater system
MLK Retrofit Strategy Medium Stormwater Parks: Stores water & provides recreational areas
Residential Retrofit Strategy Rain Gardens: Captures & slows stormwater in landscape feature
Residential Retrofit Strategy Rain Barrels: Captures & stores stormwater to be used at a later time
LEGEND Additional locations for parcel-specific green infrastructure Existing Pipes Flow Direction Vacant Retrofit Strategy Small Stormwater Parks: Stores water & provides recreational areas 34
1” = 200’
*NOTE - All properties designated on these maps are used for demonstration purposes only. No specific sites have been designated for retrofit. 35
Design Recommendations: Tier 2 Linear Strategies & Improvements on Battles Street* Maximum stormwater capacity: 66,000 gallons with a swale depth of 1’-0” Two Lane Road
Battles Street Swale
Bio-retention Swale
Sidewalk
Bio-retention Swales: Captures & treats stormwater before it enters stormwater system
Sidewalk
Stormwater Runoff
Photo Credit: Dan Manley
LEGEND
A street scale bio-retention swale would allow stormwater to be captured and treated as it makes it way to lower elevation at the north end of Battles street.
Additional locations for parcelspecific green infrastructure Existing Pipes
Battles Street
Flow Direction
*NOTE - All properties designated on these maps are used for demonstration purposes only. No specific sites have been designated for retrofit. SIDE WALK KLA W EDIS
DAOR ENAL O WT
BIORETENTION NOITNETEROIB SWALE ELAWS
SIDE KLAWWALK EDIS
TWO LANE LANE ROAD TWO ROAD
ADDED GREEN SPACE ECAPS NEERG DEDDA ON WIDER STEERSTREETS TS REDIW NO 3tfft3
t5f ft5
tfft1 1
3tfft3
5tfft5
t20 f 0ft 2 11 tf 1ft1
ECAGREEN PS NEERGSPACE DEDDA ADDED STEERTS REDIW NO ON WIDER STREETS
S T O RREM TAWAT WMROETSR PIPE EPIP
1” = 100’
STREET SECTION
001
n4i 8ft4 36
3 tf ft3
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5
510 0 0 ’ 5 = ” 1” = 5’1
tf 5.ft4 4.5
Design Recommendations: Tier 3 Upstream Storage and Downstream Treatment Strategies* Maximum stormwater capacity: 5.7 million gallons with a swale depth of 3’-0”
Conclusions The total project stormwater capacity is a maximum of 7.8 million gallons with swale depths of 1’-0” to 3’-0”. The design has potential to improve water quality through nutrient & other pollutant load reduction.
Treatment Wetlands Large Stormwater Parks: Stores large amounts of water & provides a recreational area LEGEND Additional locations for parcelspecific green infrastructure Existing Pipes Chicken House Creek Flow Direction
*NOTE - All properties designated on these maps are used for demonstration purposes only. No specific sites have been designated for retrofit.
Next Steps & Funding Priorities Next steps include moving forward with the overall stormwater master plan for North Port St. Joe and continuing conversations with potential funders on opportunities to move the project forward. Potential Collaborators and Funding Opportunities: • City of Port St. Joe • Project Area Coalition of North Port St. Joe • North West Florida Water Management District (NWFWMD) • Florida Department of Environmental Protection (FDEP) • U.S. Environmental Protection Agency (EPA) • Jesse Ball DuPont Fund (JBDF)
Next Steps: • Additional detailed analysis and design of a broader North Port St. Joe green infrastructure stormwater network, including addressing its connections to existing gray infrastructure. • Additional detailed suitability and feasibility analysis & design of potential green stormwater infrastructure projects. • Identification of policy options, outreach, and education opportunities • More detailed study of subsidence issues & solutions • Additional study of potential sea level rise & tidal influences on stormwater system • Additional water quality assessments
1” = 200’
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