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Nutrient Management in the Urban Landscape

Nutrient Management in the Urban Landscape. Rebecca Kluckhohn, P.E. Watershed Engineer West Metro Water Alliance Forum, May 18 th 2011. W. W e n c k. Engineers & Scientists. Overview: Urban/ Suburban. Why do we care? Sources Solutions Cost vs. Benefit. W e n c k.

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Nutrient Management in the Urban Landscape

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  1. Nutrient Management in the Urban Landscape Rebecca Kluckhohn, P.E. Watershed Engineer West Metro Water Alliance Forum, May 18th 2011 W W e n c k Engineers & Scientists

  2. Overview: Urban/ Suburban • Why do we care? • Sources • Solutions • Cost vs. Benefit W e n c k Engineers & Scientists

  3. Why do we care? • Water resources • lakes & streams • Regulations • MS4s • TMDL • People complain • Level of service • Budgets W e n c k Engineers & Scientists

  4. Sources • Altered hydrology • Dry deposition & wash offfrom impervious areas • Urban green space • Pet waste • Urban wildlife W e n c k Engineers & Scientists

  5. Sources…Solution • Source: Altered hydrology? • Solution: Reduce runoff • Reduce impervious area • Mitigate soil compaction • Pervious pavement • Green roof • Depressional Storage W e n c k Engineers & Scientists

  6. Sources…Solution • Source: Dry deposition & wash offfrom impervious areas • Parking lots, driveways, rooftops, sidewalks • Solution: Manage what comes off of the impervious you do have • Disconnect them • Street sweeping • Pet waste ordinance • Education W e n c k Engineers & Scientists

  7. Sources…Solution • Source(s): Urban green space • Lawns, leaf litter, phosphorus fertilizer • Pet waste • Urban wildlife • Degraded wetlands • Solution • Leaf litter ordinance • Pet waste ordinance • Education W e n c k Engineers & Scientists

  8. BMPS: Where to put them? • Rain gardens, • Bioretention • Swales • Pervious pavement • Green roofs • Underground storage • Cisterns • Understand how to link: • Cost of design, construction, O&M of stormwater BMPs/ Benefits • Impact of practices/ BMPs on water quality– target a specific outcome • Communicate a level of service to constituents W e n c k Engineers & Scientists

  9. Things to Watch for: • Linkage of TMDL goals with MS4 permit requirements/ development requirements– this will most likely be more restrictive than current standards • Move from design standards to performance standards/ effluent limits W e n c k Engineers & Scientists

  10. Things to Watch for: • Emerging practices • Water Reclamation & Reuse • Twins Stadium • Kimball, MN • Integrated Functions for Stormwater Infrastructure • Aesthetic, recreation • Green Infrastructure W e n c k Engineers & Scientists

  11. Things to Watch for: • Economic Issues: • The need to quantify & communicate the value of stormwater management • The need for financing (long-term O&M) • Groundwater impacts • Climate Change– The intersection of stormwater management and energy management • Breakdown of the separation between dealing with “storm”water and just dealing with water W e n c k Engineers & Scientists

  12. Things to Watch Out for: • Green Infrastructure vs. Grey Infrastructure Don’t throw the baby out with the bathwater…you typically need both. Grey doesn’t always mean “not green”. • You can’t deal with the 100 year event in a rain garden • Application of BMPs will always be site specific • Justify costs to keep sustainability sustainable W e n c k Engineers & Scientists

  13. Opportunities: • Look for opportunities in your practice for creating visual expressions of stormwater management/ infrastructure to further the cause of water resource protection W e n c k Engineers & Scientists

  14. Questions? W W e n c k Engineers & Scientists

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