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Modeling an Urban Development with MIKE-SWMM

Modeling an Urban Development with MIKE-SWMM. Presented by: Melissa Figurski. Site Layout. 24.17 acres 46.8% Impervious. Earth Day is every day…. Design Approaches. Who cares about the environment anyway…. MIKE-SWMM Evaluations. Pre-development Natural runoff Post-development

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Modeling an Urban Development with MIKE-SWMM

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  1. Modeling an Urban Development with MIKE-SWMM Presented by: Melissa Figurski

  2. Site Layout 24.17 acres 46.8% Impervious

  3. Earth Day is every day… Design Approaches Who cares about the environment anyway…

  4. MIKE-SWMM Evaluations • Pre-development • Natural runoff • Post-development • Sewer system pipe runoff • Grassy swale to detention pond runoff

  5. 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”

  6. Technical Paper 40 • 2 year, 24-hour Storm • 4.1 inches • 10 year, 24-hour Storm • 6.7 inches • 25 year, 24-hour Storm • 7.8 inches Design Storms for Austin, Texas Used SCS Type-II Distribution

  7. Undeveloped Site 10-year storm

  8. Site Layout 24.17 acres 46.8% Impervious

  9. Developed Site – Obtaining Watershed Parameters Does anyone know how to use this thing?!?!

  10. Developed Site – Obtaining Watershed Parameters

  11. Drainage Schematic For Pipe Flow

  12. RUNOFF Block

  13. EXTRAN Block

  14. Gutters cannot carry the 10 year storm Developed Site – concrete drainage with no controls

  15. 146 cfs!! Developed Site – concrete drainage with no controls

  16. Developed Site – Grass Drainage

  17. 78.9 cfs - Getting Better… Developed Site – Grass Drainage but there’s more work to be done!

  18. MIKE-VIEW

  19. Pond Sizing

  20. Sum Outflow Hydrographs Pond Sizing

  21. 41.3 cfs Pond Sizing 10-year Storm Storage = 126,134.8 ft3 2-year Storm Storage = 77,582.38 ft3

  22. 10-year Control 2-year Control Pond Outfall WQ Control Pond Sizing Stage-Storage Table

  23. 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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