2016 Annual AWRA Water Resources Conference


GIS Support for Hydrologic and Hydraulic Modeling and Analyses

Sunday, November 13, 2016 8:00AM to 5:00PM
Cost: $59
Register by Oct. 24, 2016

Dean Djokic, Ph.D., Esri Inc.
Peter J. Singhofen, P.E., Streamline Technologies, Inc.

Objectives: Understand the key concepts in GIS support for 1D and 2D hydrologic and hydraulic modeling:

  1. Differences in terrain processing for hydrologic and hydraulic analyses and for 1D and 2D modeling approaches.
  2. Drainage system determination and characterization.
  3. Integration of natural and man-made drainage systems into a single modeling unit.
  4. Derivation of 1D and 2D H&H modeling elements: pre- and post-processing.
  5. GIS as model integration and automation infrastructure.
  6. Roles of GIS and numerical models - single GIS environment - support for many H&H models and follow-up analyses.

Background: As a technology for spatial data storage, processing, and visualization, GIS offers many capabilities that can be used to support 1D and 2D H&H and water resources modeling. Optimizing these capabilities requires a close partnership between modeler and GIS specialist. This workshop presents a methodology to generically manage spatial data in GIS and prepare and extract a subset of that data for a specific modeling purpose. Special emphasis is placed on the symbiotic relationship between GIS and the model, both feeding off of and benefiting the other. A detailed real world example located in the Anclote River Watershed of Pasco County, Florida is used to illustrate the work flow between GIS and the model and back to GIS for visualization and further manipulation of results. In particular, the Geographic Watershed Information System (GWIS), an implementation of Arc Hydro by the Southwest Florida Water Management District (SWFWMD), is used as an example of managing watershed infrastructure that includes both natural and manmade stormwater elements. ICPR4, a comprehensive 1D/2D integrated surface water and groundwater model, is the modeling system and analytical engine used in this example. A number of advanced GIS tools are presented for terrain analyses, spatial and temporal integration, hydrologic and hydraulic characteristics extraction, 1D and 2D numerical model input and output, modeling process automation, and result mapping. While Esri's Arc Hydro, SWFWMD's GWIS and Streamline Technologies' ICPR4 are used to demonstrate the key concepts and capabilities, the concepts are general and can be used for support of any H&H, and in general, water resources model.


  1. Process description - the big picture.
  2. Understanding H&H model structure and needs.
  3. Basic spatial data in GIS
    1. infrastructure
    2. thematic polygon map layers
    3. terrain data
    4. data sources
  4. Understanding spatial projection systems and importing/exporting spatial data.
  5. Developing relationships between GIS components and model elements.
  6. Using advanced GIS tools (Arc Hydro) to develop certain modeling layers and elements.
  7. Learning when and how to simplify and generalize.
  8. Exporting data from GIS and importing to H&H model.
  9. Making refinements in the model.
  10. Model simulations and review capabilities.
  11. Import new model elements and final results into GIS
  12. Map final results in GIS

Outcomes: The expected outcomes from the workshop are that participants will understand, by way of a real world example, the fundamental principles of GIS and H&H modeling integration, will see GIS and modeling tools in action, will gain appreciation for what GIS can and cannot do for modeling, understand differences in 1D and 2D modeling support, and understand the GIS and model limitations with respect to quality of supporting data.

Attendee Requirements/Equipment: The target audience includes hydrologists, water resources engineers and managers, GIS analysts, and anyone interested in learning what GIS can do for H&H data collection, preparation, model assembly, and result processing. Attendees should have some background in GIS and/or H&H modeling. The participants will not be using computers during the workshop, so experience with particular GIS or modeling software is not required.

Number of Students: 40

Schedule: (Subject to modification)
8:00 a.m. Introduction
8:15 Process description
8:45 Description of example project area
9:00 Basic ICPR4 model building blocks
9:30 Basic spatial data in GIS and introduction to GWIS
10:15 Break
10:30 Relationships between GIS and model components
10:45 Advanced GIS tools (Arc Hydro)
11:30 Basic GIS operations and simplifications

12:00 Lunch on your own

1:00 p.m. Export pertinent data from GIS and import to ICPR4
1:30 Refine the model in ICPR4
2:00 Pre-process and review computational mesh, refine model
2:30 Simulation control and execution
3:00 Break
3:15 Review capabilities in ICPR4
4:00 Export final results and model changes and import to GIS
4:15 Map final results in GIS
4:45 Workshop summary
5:00 Adjourn


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