Structural Soils for Trees and Stormwater Erin Anderson Wenz, P.E. - - PowerPoint PPT Presentation

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Structural Soils for Trees and Stormwater Erin Anderson Wenz, P.E. - - PowerPoint PPT Presentation

May 14, 2023 509 likes •953 views

Structural Soils for Trees and Stormwater Erin Anderson Wenz, P.E. Barr Engineering Company Green Infrastructure for Clean Water - Summit 2012 September 13, 2012 Minnesota Landscape Arboretum Tree trench cross section Structural Soils

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Erin Anderson Wenz, P.E. Barr Engineering Company Green Infrastructure for Clean Water - Summit 2012 September 13, 2012 Minnesota Landscape Arboretum

Structural Soils for Trees and Stormwater

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Tree trench cross section

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Structural Soils Provide…

  • Stable base for parking lots

and pedestrian walkways

  • Uncompacted soil conditions in

highly impervious environments

  • Roots room to grow and

“breathe”

  • Less soil than other methods
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Stockholm Structural Soils

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Ingredients: angular rock, specified soil mix, water

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Ingredients: angular rock, clayey loam, peat, sulphur, hydrogel, fertilizer, water

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Maplewood Mall Example: Using Structural Soils for Trees and Stormwater

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Using Structural Soils to Reduce Stormwater Runoff involves…

  • Similar ingredients
  • A modified cross section
  • More stormwater diverted to the structural

soil in the tree trenches

  • An adjustable downstream structure that

can control and vary the water level and drawdown time in the trenches

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Tree trench cross section

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Agri Drains allow control of the water level in the tree trenches

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Structural soils with trees can provide various layers of stormwater treatment

  • Extended detention
  • Filtration
  • Infiltration
  • Interception
  • Wicking of water into soil in the tree trenches
  • Uptake of water from tree roots
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Considerations in using Structural Soils for Stormwater Management

  • Size of tributary drainage area
  • Consider wetting the structural soils

indirectly, rather than driving water directly through

  • Conveyance during larger storm events
  • Adjustable outlets
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– Central Corridor Light Rail Transit Corridor – White Bear Ave (between Larpenteur and Hoyt) – 4th Street (between Minnesota and Cedar) – North Quadrant Development (7th Street, between Wacouta and Sibley) – Payne Ave north of Phalen Boulevard – Upper Landing plaza (near Chestnut and Shepard Road intersection) – Summit Avenue – Mears Park – Xcel Center – Como Park – 4th Street Ramp – Minnesota Department of Human Services – State Capital – Riverview Busway

Structural Soils Projects in St. Paul

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– W 54th Street – Riverside (between 20th St. and 22nd St.) – 25th Ave SE – 14th Ave N – Washington Ave – 2nd Ave and Marquette Ave – Target Field – Xcel Plaza – Pat’s Tap plaza – University of Minnesota – U of MN Childrens’ Hospital – 730 Lofts – Chicago Avenue – Lowry Ave and Lake Street – Skyscape Towers – Minneapolis Technical College – Opus Northwest Building – Hennipen Ave Theater District – Hennipen County Government Center – Midtown Exchange

Structural Soils Projects in Minneapolis

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Structural Soils Projects in Other Cities

  • Edina
  • Duluth
  • Apple Valley
  • St. Louis Park
  • Brainerd
  • Osseo
  • St. Peter
  • Mankato
  • Minnetonka
  • Northfield
  • Wayzata
  • Bloomington
  • Rochester
  • Marshall
  • Sauk Rapids
  • Lino Lakes
  • Bird Island
  • Staples
  • Maple Grove
  • Columbia Heights
  • Maplewood
  • Cottage Grove
  • Golden Valley
  • Ramsey
  • Burnsville
  • St. Michael
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