Modeling an Urban Development with MIKE-SWMM

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Modeling an Urban Development with MIKE-SWMM

• Presented by Melissa Figurski

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Site Layout
24.17 acres 46.8 Impervious
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Design Approaches
Who cares about the environment anyway
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MIKE-SWMM Evaluations

• Pre-development
• Natural runoff
• Post-development
• Sewer system pipe runoff
• Grassy swale to detention pond runoff

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Design Criteria, City of Austin

• Drainage Criteria Manual detention ponds
• Ponds shall be designed to reduce
  post-development peak rates of discharge to
  existing pre-development peak rates of discharge
  from the 2, 10, and 25 year storm events at each
  point of discharge from the project or
  development site.
• Environmental Criteria Manual runoff treatment
  volume
• one-half inch of runoff plus an additional
  one-tenth inch for each ten percent increase of
  gross impervious cover over twenty percent within
  the drainage area to the control

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Design Storms for Austin, Texas

• Technical Paper 40

Used SCS Type-II Distribution
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Undeveloped Site 10-year storm
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Site Layout
24.17 acres 46.8 Impervious
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Developed Site Obtaining Watershed Parameters
Does anyone know how to use this thing?!?!
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Developed Site Obtaining Watershed Parameters
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Drainage Schematic
For Pipe Flow
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RUNOFF Block
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EXTRAN Block
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Developed Site concrete drainage with no
controls
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Developed Site concrete drainage with no
controls
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Developed Site Grass Drainage
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Developed Site Grass Drainage
but theres more work
to be done!
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MIKE-VIEW
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Pond Sizing
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Pond Sizing
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Pond Sizing
10-year Storm Storage 126,134.8 ft3 2-year
Storm Storage 77,582.38 ft3
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Pond Sizing
Stage-Storage Table
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Almost There

• Input Pond Stage/Storage Data into MIKE-SWMM
• Size Pond Outfall Structures for 2 and 10-year
  Storms
• Convince World to Use Swales

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