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Watershed Modeling Nuts and Bolts:Arc Hydro
Dean Djokic
ESRI, Inc.
Presentation Topics
• Arc Hydro Data Model
• Arc Hydro Tools
• SWFWMD customization of Arc Hydro
Arc Hydro Data Model
Arc Hydro
• Extension of geodatabase model for support of water resources applications (template data model)– Surface and groundwater
• Collection of tools for support of Arc Hydro geodatabase design and basic water resources functions
• Starting point for water resources database and application development
Data Model Purpose
• Target audience: Water resources community interested in quick start in ArcGIS implementation
• Starting point for project model design• Not a “do all” design• Not implementation/application specific, but provides
the key components to develop on top of• Not a numerical but a DATA model
– Allows support for many models
Describing the Hydrologic Cycle
Arc Hydro Framework Data Model
Surface water featuresGroundwater features
Time Series
Arc Hydro Data Model Details
• Detailed representation at the end of corresponding chapters in the book (e.g. p 51)
Time Series Components
Basic Concepts
• Define core feature classes for water resources analyses– Inventory of relevant spatial elements
• Establish relationships between core feature classes– So we know what is connected to what
• Use geometric network for tying pieces together– So we can trace upstream/downstream
• Mobilization of standard ArcGIS functionality
• Custom tools for some of the attribute management• Custom tools for advanced “water resources”
functionality
Application and use of Arc Hydro for a Water Geofabric
1. Build and compile key GIS
Databases
2. Build and serve key Digital
Basemaps
3. Build and serve Operational
Layers
4. Build and serve
Tasks
5. Build and serve key
GIS Applications
GIS Application
Operational layers
Digital Basemap (2D or 3D)
Tasks that operate against . . .
. . . a fully operational GIS database
(a Geofabric)
Scalability
1:17,000,000
1:5,000,000
1:2,500,000
1:500,000
1:175,000
1:40,000
1:24,000
1:5,000
Arc Hydro Tools
Key Concepts
• Transitions between the raster and vector worlds – integrated operations
• “Relationships between objects linked by tracing path of water movement”
Raster NetworkVector
Logical SchemaExtended Network
Terrain Processing
• Start with the terrain model
• Identify drainage patterns
• Identify catchments
Network Generation
• Start with the drainage pattern
• Define hydro edges from drainage lines
• Generate junctions at confluences
• Build the geometric network
Connecting Catchments to Junctions
• Start with the catchments
• Identify drainage points
• Link drainage points to junctions
Extended (Hydrologic) Network
• Combination of hydro network and drainage areas connected through junctions.
• Allows tracing through network and selection on drainage areas
Node-Link Schematization (1)
• Start with the catchments
• Find centroids
• Continue with drainge lines
• Find confluences
• Connect nodes
• Transition from geo representation to logical representation
Node-Link Schematization (2)
• Support for various modeling efforts
Arc Hydro Tools
• 70 + functions currently available –Watershed Delineation–Batch Terrain Preprocessing–Schema Creation–Parameters Accumulation–Parameters Computation (e.g. mean elevation, 10-
85 slope, etc.)–Time Series
Arc Hydro Tools
• Functions developed during projects are integrated into the Arc Hydro tools (needs driven development)–Batch Terrain Preprocessing–Parameters Computation –Terrain Morphology–and others…
Process Automation in Model Builder Arc Hydro Model For Hydro Landscape Characterization
Many Aspects of Arc Hydro
Saxe, John Godfrey, 1963, “The Blind Man and the elephant”, New York: Whittlesley House
Database design
Application
“Standard”
Tools
Marketing
Development environment
Elephant illustration ©2002 Jason Hunt www.naturalchild.org/jason
“Why Should I Care” about Arc Hydro ?
• Economy of development– Why reinvent the wheel?– Established configuration methodology– Established development framework
• Industry “standard”– Fundamental geodatabase design principles implemented for water
resources theme– Established techniques rolled into a publicly available utility– Tested and accepted
• Training and support• Free maintenance – ESRI’s commitment to the water
resources community
SWFWMD Customization of Arc Hydro
Watershed Evaluation
Watershed Management Plan
Implementation of BMPs
Maintenance of WatershedParameters and Models
Topographic Information
Watershed Management Program
Arc Hydro Customization at SWFWMD
Arc Hydro data model extension GWIS (Geographic Watershed Information System) Modeling support (ICPR)
Deranged terrain processing Management of pitted terrains
Structures Hydraulic element points Hydraulic subelements
Tools Arc Hydro geodatabase import Geoprocessing
Delineate Catchments Draining into Selected Sinks (where “IsSink” = 1)
Prescreen & Evaluate Sinks - Select Based on User Thresholds
Natural Drainage Patterns - Pitted Terrain Analysis
Drainage Points within Catchments
HydroJunctions
Surface Connectivity
HydroEdges(Low Point of Basin or
Low Point of Boundary)(Boundary Link Flowlines)
Hydraulic Features Modify Natural Drainage Patterns
Same HydroCode assigned to Hydrojunction & Subelements (i.e. 302125_003)
TR = Top of Road UIC = Upstream Invert of Culvert,
GR = Natural Ground ERM = Elevation Reference Mark
HydroJunction
Hydraulic Element Points
HydroJunction / HydroEdge
Sub Elements
Hydraulic Element Points
General Location & Type
Hydraulic Structure Information Tables
Specific Location (X, Y) & Elevation (Z)
Hierarchy of Hydraulic Features
Field Acquisition of Hydraulic Features
• Utilize field technology– ArcPad– ArcGIS Mobile
• Direct synchronization with enterprise database– Eliminate duplication of data entry– Enforce geodatabase integrity between
enterprise and mobile environments
• High accuracy possible with DGPS• Variety of devices
Connect HydroJunction toolHydraulic Element Points identify a culvert location
User manually places HydroJunction
(and snaps it to Drainage Boundary)
Tool connects HydroJunction
(and creates Structure Link)
Watershed Evaluation Results
• A fully connected geodatabase integrating:– Raster and vector data– Derived and surveyed data – Natural and man-made flowpath features
• Characterized elements (basins, links, structures) in well defined database structure ready to be used in the next step of the process
• Basically: “Watershed parameters in District’s generic Arc Hydro GIS format (GWIS)”– Geofabric for SWFWMD
Arc Hydro as production databaseIntegrates data formats and model databases
Courtesy of South West Florida Water Management District (SWFWMD)
Questions?