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Arc Hydro for EPA Basins
David R. Maidment, University of Texas at Austin
Dean Djokic, ESRI, Redlands
• Implement Basins on Arc
Hydro now for a region of
interest
• Examine new environmentwide modeling approaches
for specific constituents
e.g. Mercury, bacteria
Hydrologic Information System
Hydrologic Modeling
Arc Hydro
Geodatabase
Arc Hydro Extension for EPA Basins
• Arc Basins –
– Builds on core Arc
Hydro landscape
representation
– Provides additional
feature datasets and
tables to store Basins
data
Arc Hydro
Feature classes
Basins feature
classes
Arc Basins as one geodatabase
Arc Basins as two related databases
Connect these two databases using relationships
Geodatabase stores
geographic feature classes
Relational database stores
purely tabular information
National Water Information System
Web access to USGS water resources data in real time
Arc Hydro Toolset Ver 1.0
Provides tools for processing raster and vector data
and populating the attributes of the Arc Hydro data model
Arc Hydro USA
• Arc Hydro Framework
dataset for USA at
1:500,000 scale
• Built from USGS and
National Weather
Service data
• HydroPoints are active
USGS stream gaging
stations
ArcGIS Hydro Data Model
Drainage System
Hydro Network
Flow
Time
Time Series
Hydro Features
Channel System
Streams
Drainage Areas
Hydrography
Channels
Terrain Surfaces
Rainfall Response
Digital Orthophotos
Thematic
Layers
supporting the
Arc Hydro
data model
(from Michael Zeiler
“Modeling Our World”
Volume 2)
Data Model Based on Behavior
Follow a drop of water from where it falls on the
land, to the stream, and all the way to the ocean.
Integrating Data Inventory using
a Behavioral Model
Relationships between
objects linked by tracing path
of water movement
Hydrologic Information System
Hydrologic Analysis
and Modeling
Arc Hydro
Geodatabase
Other Arc Hydro
Implementations
• USGS
– Stream Stats
• HEC
– GeoRAS
– GeoHMS
Streamstats
Conclusions
• Chief innovations of ArcGIS
– Network, geodatabase, object modeling
• Chief innovations of ArcHydro so far
–
–
–
–
HydroNetwork
New raster tools and methodology
HydroID – relationships
Integration of Time and Space in a single system
• Geodatabase – convenient for working with large
vector datasets (use larger packaging units than 8digit HUC’s)
Arc Hydro for EPA Basins
David R. Maidment, University of Texas at Austin
Dean Djokic, ESRI, Redlands
• Implement Basins on Arc
Hydro now for a region of
interest
• Examine new environmentwide modeling approaches
for specific constituents
e.g. Mercury, bacteria