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Arc Hydro: GIS for Water ResourcesDavid R. Maidment
University of Texas at Austin
• Arc Hydro– Culmination of a 3-yr effort
– GIS in Water Resources Consortium
– Customization of ArcGIS for water resources
– Arc Hydro toolset and application framework
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GIS in Water Resources Consortium
Bringing together these two communities by using a common geospatial data model
http://www.crwr.utexas.edu/giswr
GISWater
Resources
CRWR
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Geodatabase
MS Access Oracle
SQL Server Informix
DB2
Feature
IFeature : IRowIFeature
IFeatureBuffer IFeatureBuffer : IRowBuffer
IFeatureDraw IFeatureDraw : IUnknown
ArcGIS Introduces
• A new geographic data model• A new geographic database
– Stored in an Relational Database (Geodatabase)
• ArcObjects– Component Object Model
(COM) objects that access geographic data
– Works like MS Word, Excel, Powerpoint, ….
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Geodatabase Model
FeatureFeature Geographic ObjectGeographic ObjectRow in DBMS TableRow in DBMS Table
GeodatabaseGeodatabaseCollection of FeatureDataSetsCollection of FeatureDataSetsLike a workspaceLike a workspace
FeatureDataSetFeatureDataSetCollection of FeatureClassesCollection of FeatureClassesLike a CoverageLike a Coverage
FeatureClassFeatureClass Collection of FeaturesCollection of FeaturesLike a Coverage FeatureClassLike a Coverage FeatureClass
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• Features are geographic objects stored in relational database tables
• Feature location is an attribute of type shape
– Point, Multipoint, Line, Polygon
– Attributes and geometry are stored together not in separate files as in Arc Info 7 and ArcView 3
Features
Feature Feature (row)(row)
ShapeOID
524 X,Y,Z,M, ...
StreamStream
Type
Channel
. . .
. . .
FeatureClass (table)FeatureClass (table)
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Feature DataSets
• A holder for a set of feature classes having a common coordinate system and spatial extent
GeoDatabaseGeoDatabase
FeatureClassFeatureClass
Feature Feature (row)(row)
ShapeOID
524 X,Y,Z,M, ...
StreamStream
Type
Channel
. . .
. . .
FeatureClass (table)FeatureClass (table)
Object ClassObject Class
FeatureDatasetFeatureDataset
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Extensible Data Model
StreamStream
BasinBasin
FeatureFeature
GageGageConfluenceConfluence
ComplexEdgeComplexEdgeSimpleJunctionSimpleJunction
NetworkFeatureNetworkFeature
JunctionFeatureJunctionFeatureEdgeFeatureEdgeFeature
RowRow
MeasurementMeasurement
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What is Arc Hydro?
• An data infrastructure for storing and integrating hydro data within ArcGIS– A set of hydro objects built on top of
ArcObjects– A set of standardized attributes– A vocabulary for describing data (glossary)– A toolset for implementing the data model
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Flow
Time
Time Series
Hydrography
Hydro Network
Channel System
Drainage System
Arc Hydro Components
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Arc Hydro Data Model
Hydrography Hydrology
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Streams
Drainage Areas
Hydrography
Channels
Terrain Surfaces
Rainfall Response
Digital Orthophotos
Data Model Based on Inventory
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Data Model Based on BehaviorFollow a drop of water from where it falls on the land, to the stream, and all the way to the ocean.
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Integrating Data Inventory using a Behavioral Model
Relationships betweenobjects linked by tracing pathof water movement
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• Arc Hydro Framework dataset for USA at 1:500,000 scale
• Built from USGS and National Weather Service data
• MonitoringPoints are USGS stream gaging stations
Arc Hydro USA
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Streams
Watersheds Waterbody
Monitoring Points
Arc Hydro Framework Input Data
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Feature
Waterbody
HydroIDHydroCodeFTypeNameAreaSqKmJunctionID
HydroPoint
HydroIDHydroCodeFTypeNameJunctionID
Watershed
HydroIDHydroCodeDrainIDAreaSqKmJunctionIDNextDownID
ComplexEdgeFeature
EdgeType
Flowline
Shoreline
HydroEdge
HydroIDHydroCodeReachCodeNameLengthKmLengthDownFlowDirFTypeEdgeTypeEnabled
SimpleJunctionFeature
1HydroJunction
HydroIDHydroCodeNextDownIDLengthDownDrainAreaFTypeEnabledAncillaryRole
*
1
*
HydroNetwork
*
HydroJunction
HydroIDHydroCodeNextDownIDLengthDownDrainAreaFTypeEnabledAncillaryRole
HydroJunction
HydroIDHydroCodeNextDownIDLengthDownDrainAreaFTypeEnabledAncillaryRole
Arc Hydro Framework
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Arc Hydro Framework Dataset for the Guadalupe Basin
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HydroNetwork through Canyon Lake
Generic Junction (for topological connection of edges)
Flowlines through water body
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HydroJunction has Waterbody Relationship
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National Hydro Data Programshttp://www.crwr.utexas.edu/giswr/nhdconf/nationalhydro.html
National Elevation Dataset (NED)
National Hydrography Dataset(NHD)
Watershed Boundary DatasetElevation Derivatives forNational Application (EDNA)
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Hydrologic Cataloging Units (HUCS)
Guadalupe Basin(4 HUC’s)
Hydrologic Unit Code = 12100203
• 2015 HUC’s cover continental US• average area ~ 1 county
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NWS forecast Watersheds(flooding)
EPA TMDL Segments(water quality)
TNRCC water availability points(water supply)
GuadalupeHydroNetwork
Watersheds of the Guadalupe Basin
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Regional Analysis
HydroNetwork to provide connectivity of flow through large regions
Digital elevation modelfor terrain analysis withinbasins
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Scales of representation of Drainage Systems
Basins – drainage areas for water resources management
Catchments – subdivision of Basin into elementary drainage areas by physical rules
Digital Elevation Model – land surface terrain grid cells
Watersheds – subdivision of Basinfor a particular hydrologic purpose
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Catchments, DrainageLines and DrainagePoints
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Catchments Subdivided at Watershed Outlet
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EDNA Catchments
Average area = 7.5 km2
Designed for remapping of Nexraddata onto drainage units
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TSDateTime
FeatureID
TSType
TSValue
Arc Hydro Time Series Object
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National Water Information System
Web access to USGS water resources data
Arc Hydro NWIS dataretrieval tool
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HydroID and HydroCode
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Retrieving NWIS Data
• Select Gage Layer
• Enter Period of Record
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Streamflow Time Series
Arc Hydro Time Series Table
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Time Series Extracted to Excel(In Excel, use Data/Get External Data to query Geodatabase)
Geodatabase view
Excel view
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HRAP Cells for Nexrad Data
Average area = 14.5 km2
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Coupling Spatial and Temporal Data
1 hour Nexrad Rainfallon the Guadalupe Basin
October 13, 2001
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Water Balance in the Landscape
Atmospheric Water
Soil Water Surface Water
Groundwater
Precipitation
Evaporation
Runoff
Recharge
Baseflow
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EDNA Catchments
Average area = 7.5 km2
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Intersection of Nexrad and Catchments
Atmospheric Water
Soil Water Surface Water
Surface Water Balance
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Modflow Groundwater Cells
Average area = 2.6 km2
Modflow Model of theEdwards-Trinity
aquifer
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Intersection of Nexrad and Modflow Cells
Atmospheric Water
Groundwater
Groundwater Balance
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Intersection of Nexrad, Catchments and Modflow
Atmospheric Water
Soil Water Surface Water
Groundwater
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What software do you need?
• ArcView 8.2 – Viewing, querying existing geodatabases– Editing feature classes and adding data
• Spatial Analyst for ArcGIS– To operate the raster tools in Arc Hydro
• ArcInfo 8.2– To build geometric networks and create new
relationships
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Arc Hydro Tools Version 1.0
• Raster processing– DEM processing
– Watershed delineation
• Vector processing– Arc Hydro attributes
– Network analysis
• Time Series and Application Utilities
• Buttons
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Hydrologic Information System
Analysis, Modeling, Decision Making
Arc Hydro Geodatabase