Integrating Site Design and Stormwater Management

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Integrating Site Design and Stormwater Management
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Recommended Site Design Procedure For
Comprehensive Stormwater Management

• General Questions
• How can stormwater management be best integrated
  into the site planning process?
• How can BMPs (Best Management Practices) be
  selected to maximize their performance?
• What must be considered in order to meet
  Construction NPDES permitting requirements?

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• Three Primary Elements Of Site Planning
• Site Analysis
• (Chapter 4 PA Stormwater BMP Manual)
• Non-structural BMP opportunities analysis
• (Chapter 5 PA Stormwater BMP Manual)
• Structural BMP opportunities analysis
• (Chapter 6 PA Stormwater BMP Manual)

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Site Analysis
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Importance of Site Analysis/Assessment

• Comprehensive stormwater management must begin
  with a thorough assessment of the site and its
  natural systems.
• The site assessment includes taking inventory of
  and evaluating the various natural resource
  systems which define each site and pose both
  problems and opportunities for stormwater
  management.
• Special protection waters -- Known flooding
  problems
• Wetlands -- Steep slopes
• Shallow bedrock/groundwater -- Soil types
• Karst/abandoned mines -- Endangered species

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Non-Structural BMPs
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Importance of Non-Structural BMPs

• These practices can reduce land clearing and
  grading costs, reduce infrastructure costs,
  reduce stormwater management costs, and increase
  community marketability and property values.
• Long term, they sustain their stormwater
  management capacity with reduced operation and
  maintenance demands.
• Prevent stormwater generation and not just
  mitigate stormwater related impacts once the
  problem has been generated.

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Structural BMPs
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Importance of Structural BMPs

• Once prevention has been maximized, it is likely
  that some amount of stormwater peaking and volume
  control will remain to be managed.
• Can be engineered to perform rate control and
  volume reduction functions with a relatively high
  degree of certainty.
• Provide allot of options to fit varying types of
  project sites.

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In Summary

• 1) Perform a thorough site analysis to determine
  constraints versus opportunities.
• 2) Maximize implementation of non-structural
  BMPs.
• 3) Determine remaining rate and volume of
  storm-water to be managed and design structural
  BMPs to address that rate and volume.
• 4) Finalize your integrated stormwater
  management design.

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Questions?