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Managing Water Infiltration in Clay Soils in Plymouth

Learn about the challenges of infiltrating water in clay soils, solutions such as conservation areas, rain gardens, and porous pavements, and how Plymouth is addressing water volume issues to protect its resources.

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Managing Water Infiltration in Clay Soils in Plymouth

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  1. City of Plymouth Infiltration in Clay Soils West Metro Watershed Alliance Protecting our Water Resources - March 23, 2011

  2. Infiltration in Clay Soils • Problem: • Soil composition • The particle, or grain size, of clay soil is 500 times smaller than sand (~1.0mm vs. ~0.002mm) • The infiltration rate of clay, is 25 times slower than sand (2.5 in/hr vs. 0.1 in/hr).

  3. Infiltration in Clay Soils

  4. Infiltration in Clay Soils • Problem: • MPCA required selected City’s to address significant new or expanded water volume discharges in their Storm Water Pollution Prevention Programs…i.e…figure out a way to reduce volume discharge. • The City of Plymouth included volume requirements in our Surface Water Management Plan (2008)

  5. Infiltration in Clay Soils • Problem: • Erosion repair and stream restoration capital improvement projects completed since 2005 to repair the impacts from water volume in Plymouth have cost ~$3,000,000. • One project example is the Plymouth Creek Stream Restoration Project

  6. Plymouth Creek Stream Restoration • Severe erosion existed along the creek. • The erosion was partially the result of increased water volumes. • This project assists the City in meeting the goals of the Medicine Lake Total Maximum Daily Load study. • Funding partners include the Bassett Creek Watershed Management Organization, the Minnesota Board of Water and Soil Resources (through BCWMO), Hennepin County, and the City of Plymouth

  7. Plymouth Creek Stream Restoration

  8. Infiltration in Clay Soils • Problem: • Water volume contributes to erosion and nutrient loading to lakes, wetlands, streams, and other resources.

  9. Infiltration in Clay Soils • Solutions: • Conservation Areas • Buffers/Shoreline Restorations • Soil Amendments • Disconnection of Impervious Surfaces • Reduced Street Width • Porous Pavements • Rain Gardens

  10. Infiltration in Clay Soils • Buffers/Shoreline Restorations:

  11. Infiltration in Clay Soils • Disconnection of Impervious Surface:

  12. Infiltration in Clay Soils • Reduced street width: 33 feet 28 feet

  13. Infiltration in Clay Soils • Porous Pavements:

  14. Infiltration in Clay Soils • Rain Gardens:

  15. Infiltration in Clay Soils • Considerations: • Water volume can contribute to water quality impairments and result in significant capital expenditures to address the problem • Many practices are available, even in clay soils, to reduce the runoff of water • Every municipality is unique and some practices may work better than others in your community.

  16. Questions?Derek AscheWater Resources Manager763-509-5526dasche@plymouthmn.gov

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