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Conservation Design & Volume Reduction Hanover, MN

Conservation Design & Volume Reduction Hanover, MN. Two Project Phases . 2007:Conservation Design 2009-2010: Water resource planning and regulation development Water resource management plan Stormwater ordinance CD ordinance PUD ordinance. Conservation Design Project - 2007 . Goals

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Conservation Design & Volume Reduction Hanover, MN

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  1. Conservation Design & Volume ReductionHanover, MN

  2. Two Project Phases • 2007:Conservation Design • 2009-2010: Water resource planning and regulation development • Water resource management plan • Stormwater ordinance • CD ordinance • PUD ordinance

  3. Conservation Design Project - 2007 • Goals • Understand concept through concept design for actual parcel facing development • Understand key design features: • Open space percentages • Density • Impervious surfaces • Anticipate regulations needed to support and guide CD development

  4. What is Conservation Design?

  5. What is Conservation Design?

  6. Steep Slopes & Waterways Wetlands Vegetation & Farmsteads COMPOSITE

  7. Conservation Design Scenario 1: 100 foot lots

  8. Conservation Design Scenario 2: 80 foot lots

  9. Conventional Development 2.5 Acre lots

  10. Development Analysis

  11. Water Resource Planning & Regulation Development 2009-2010 • Goals • Develop stormwater performance standards • Rate • Volume • Water quality • Performance vs. prescription • Improve standards, but balance with economic development.

  12. Planning Concerns with Infiltration Practices and Volume Control Performance Standards • How will this work in different areas of the city? • What is spatial impact of different volume control standards? • What is reasonable balance between volume control standards and development cost?

  13. BankWest Planning Example

  14. Stormwater Performance Standards: Volume Control • New Development: • Limit post development runoff volume to pre-settlement runoff volume for the 1-year storm in A and B soils. • Redevelopment: • Limit post development runoff volume to pre-settlement runoff volume for the 1-year storm in A and B soils.

  15. BankWest Example: Volume

  16. Stormwater Performance Standards: Rate Control • New Development • Limit post development runoff rate to presettlement runoff rate for the 1, 10, and 100-year storm, or • 0.1 cfs/acre, whichever is greater. • Redevelopment • Limit post development rate to existing rate for 1, 10, and 100-year storm

  17. BankWest Example: Rate

  18. Conclusions • Visualizing concepts builds political support for change. • Local examples make a difference • No need to regulate actual impervious surface with volume control standards. • Minimizes regulations • Increases development flexibility

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