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Expanding Your Watershed Toolbox
October 18, 2012
Ron Geiger
Anthony Henry
2012 SESWA Conference
Chattanooga, TN
GIS and 2D Dynamic Modeling
The Evolution of Storm Water Engineeringhow far have we come…..The Evolution of Storm Water Engineeringhow far have we come…..
And then we invented the Spreadsheet….And then we invented the Spreadsheet….
• HGL• Detention Routing
AgendaAgenda
• Challenges of today’s storm water managers
• Common Tools that are a must have
• Options to consider in choosing the right tools
• Leveraging GIS and Dynamic Models
• Lessons Learned
Challenges of Today’s Storm Water ManagersChallenges of Today’s Storm Water Managers
• It’s more than flooding• Public is more demanding• Technology allows for more
questions, more detail• Not just where, but when,
and how much
Common Tools that are a Must HaveCommon Tools that are a Must Have
• Interactive HGL Analysis• GIS
• Physical Data on Drainage System• Land Use Data• Surface Terrain
• Eyewitnesses• Past problems documented/high water marks• Dates of flooding• Photos of overland flooding, surcharging
Not all 2D models are equalNot all 2D models are equal
• 1D SWMM – 2D TUFLOW• Grid
• 1D SIM (InfoWorks) – 2D InfoWorks 2D• Flexible triangular mesh
• 1D Mouse or Mike – 2D • Fixed or flexible Grid or triangular mesh
GIS and Dynamic ModelingGIS and Dynamic Modeling
• Process of building a model• 1D and 2D modeling• Mesh development• Common problems• Advantages• Examples in urban environments
Process of building a modelProcess of building a model
• GIS extension• Work in GIS directly
• External product with Import and Export of GIS data • Shape files or directly from Geodatabase
M-A-1
M-A-2
M-A-3
M-A-4
M-A-6
M-A-7
M-B-22
M-C-1
M-C-2
M-C-3
M-C-4
M-C-5
M-C-6
M-C-8
M-C-9
9463
9312
9125
8866
1D and 2D modeling1D and 2D modeling
• 1D for pipe and channel flow• Inlets and catchbasins• Pipe geometry• Open channel – natural or engineered• Ponds and detention basins
1D and 2D modeling1D and 2D modeling
• 2D for overland flow – flow out of channel• Down streets and over curbs• Between and through buildings• Across open land• Ponds and detention basins
Mesh developmentMesh development
• Surface terrain – Grid or TIN• DTM / DEM• LiDAR• Contours
• Surface features• Road curbs and centerlines• Buildings• Roughness polygons• Break lines and walls
Common problemsCommon problems
• GIS data may have holes or incorrectly entered data• Terrain data may need ‘scrubbing’ particularly for channels• Defining 2D surface appropriately• Interaction between 1D and 2D – Node or Line
AdvantagesAdvantages
• Better understanding of system• Identify causes of problems• Formulate workable solution
Example in urban environmentsExample in urban environments
• Old system
Irish Buffalo Trib O SoutheastAVI
Example in urban environmentsExample in urban environments
• Revenge of the creek
Washington Heights AVI
Lessons LearnedLessons Learned
• Existing GIS data is abundant• Learning curve in model building• Cost outweighed by flexibility and added benefits• Simple options may still be the best way
Questions/CommentsQuestions/Comments
Ronald A. Geiger, PEWater Resources ManagerHDR Engineering, Inc.Charlotte, [email protected]
Anthony HenrySr. Hydraulic ModelerHDR Engineering, Inc.Austin, [email protected]