city of saint paul rain garden...
TRANSCRIPT
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CITY OF SAINT PAUL PUBLIC WORKS RAIN GARDENS
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The City of Saint Paul in partnership with Capital Region Watershed District offers boulevard garden installations to residents in street reconstruction project areas.
• The City excavates the gardens, installs the curb cuts and provides topsoil and mulch for the rain gardens.
• Capital Region Watershed District supplies the plants, garden design and does much of the public outreach.
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Accomplishments
•Since 2008, the City of Saint Paul Public Works has installed 222 boulevard rain gardens.
•Estimated treatment = 22,000 cu. ft. of storm water off the streets.
•Estimated cost = $8 per foot of storage
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Graphic courtesy of Capital Region Watershed District
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Details
• 18” of rain garden soil.
• 3” layer of double shredded hardwood mulch
• Concrete splash pads at the curb cut slow water flow
and provide ease for homeowners to remove sediment.
• 2’ Buffer from curb and sidewalk
• Do Not excavate within the drip line of an existing boulevard tree.
Material (Mn/DOT Specification) Composition by Weight
Sand Cover (3149.2 J) 60%
Compost, Grade 2 (3890.2 B) 40%
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Side Boulevard Rain Garden planted in 2012
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Construction
Excavation Curb Cut
Planting Day
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Lessons Learned • Offer limited options for planting plans.
• Offer one plan for shade and one for sun. This gives a cohesiveness to the neighborhood.
• Constrain Plant list to 5 or 6 species per garden. • This makes it easier for home owners to identify desirable
plants.
• Sort the plants for each garden before the residents arrive on planting day. • People get cranky when they have to wait.
• Manage expectations. • Make sure homeowners understand their responsibility to
maintain the garden up front.
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Too many plant species!
Artistic Rendition
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Example of Preferred Planting Plans
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Typical Sun Plants
Prairie Dropseed
June Grass
Turtlehead
Goldstrom Coneflower
Wild Petunia
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Typical Shade Plants
Great Blue Lobelia
Jacob’s Ladder
Pennsylvania Sedge
ZigZag Goldenrod
Wild Geranium
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A rain garden does require some extra maintenance initially, including extra watering and weeding for the first 2-3 years
Homeowner Responsibilities
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Volunteers are out there
Science Area Teen Network
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Rain gardens and Public Art
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Other Storm water Management • We have not received Watershed credits for the
boulevard rain gardens we have constructed.
• Storm water management techniques we use for meeting watershed goals include: • Bio-infiltration Basins – large scale rain gardens • Underground Infiltration Trenches • Tree Trenches
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Bio-Infiltration Basin in created ROW
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Underground Infiltration Trenches
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Underground Infiltration Trenches
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Overflow Manhole and Pipes for Infiltration Trench
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Modified Tree Trench
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Public Works Achievements • Since 2006, Public Works Street Engineering has constructed storm
water management devices, treating over 450,000 cu. ft. of water per rain event.